release v1.1.6

refactor: reduce gocyclo of doHttpRequest func
refactor: reduce gocyclo of ToString func
2026-02-04 12:52:28 +08:00 · 2022-01-03 15:58:19 +08:00 · 2022-01-03 15:53:25 +08:00 · 2022-01-03 15:15:22 +08:00 · 2022-01-03 14:57:14 +08:00 · 2022-01-02 22:12:01 +08:00
28 changed files with 833 additions and 358 deletions
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
 <div align="center" style="text-align: center;">

 ![Go version](https://img.shields.io/badge/go-%3E%3D1.16<recommend>-9cf)
-[![Release](https://img.shields.io/badge/release-1.0.10-green.svg)](https://github.com/duke-git/lancet/releases)
+[![Release](https://img.shields.io/badge/release-1.1.6-green.svg)](https://github.com/duke-git/lancet/releases)
 [![GoDoc](https://godoc.org/github.com//duke-git/lancet?status.svg)](https://pkg.go.dev/github.com/duke-git/lancet)
 [![Go Report Card](https://goreportcard.com/badge/github.com/duke-git/lancet)](https://goreportcard.com/report/github.com/duke-git/lancet)
 [![codecov](https://codecov.io/gh/duke-git/lancet/branch/main/graph/badge.svg?token=FC48T1F078)](https://codecov.io/gh/duke-git/lancet)
@@ -21,7 +21,7 @@ English | [简体中文](./README_zh-CN.md)
 ### Feature

 - 👏 Comprehensive, efficient and reusable.
- 💪 100+ common go util functions, support string, slice, datetime, net, crypt...
+- 💪 140+ common go util functions, support string, slice, datetime, net, crypt...
 - 💅 Only depend on the go standard library.
 - 🌍 Unit test for exery exported function.

@@ -145,6 +145,8 @@ func HmacMd5(data, key string) string //get hmac md5 value
 func HmacSha1(data, key string) string //get hmac sha1 value
 func HmacSha256(data, key string) string //get hmac sha256 value
 func HmacSha512(data, key string) string //get hmac sha512 value
+func Md5String(s string) string //return the md5 value of string
+func Md5File(filename string) (string, error) //return the md5 value of file
 func Sha1(data string) string //get sha1 value
 func Sha256(data string) string //getsha256 value
 func Sha512(data string) string //get sha512 value
@@ -276,6 +278,10 @@ func (f Fn) Curry(i interface{}) func(...interface{}) interface{}  //make a curr
 func Compose(fnList ...func(...interface{}) interface{}) func(...interface{}) interface{}  //compose the functions from right to left
 func Delay(delay time.Duration, fn interface{}, args ...interface{})  //invoke function after delayed time
 func Schedule(d time.Duration, fn interface{}, args ...interface{}) chan bool //invoke function every duration time, util close the returned bool chan
+func (w *Watcher) Start() //start the watch timer.
+func (w *Watcher) Stop() //stop the watch timer
+func (w *Watcher) Reset() {} //reset the watch timer.
+func (w *Watcher) GetElapsedTime() time.Duration //获取代码段运行时间
 ```

 #### 7. netutil is for net process
@@ -386,20 +392,27 @@ func Chunk(slice []interface{}, size int) [][]interface{} //creates an slice of
 func ConvertSlice(originalSlice interface{}, newSliceType reflect.Type) interface{} //convert originalSlice to newSliceType
 func Difference(slice1, slice2 interface{}) interface{} //creates an slice of whose element not included in the other given slice
 func DeleteByIndex(slice interface{}, start int, end ...int) (interface{}, error) //delete the element of slice from start index to end index - 1
+func Drop(slice interface{}, n int) interface{} //creates a slice with `n` elements dropped from the beginning when n > 0, or `n` elements dropped from the ending when n < 0
 func Every(slice, function interface{}) bool //return true if all of the values in the slice pass the predicate function, function signature should be func(index int, value interface{}) bool
 func Filter(slice, function interface{}) interface{} //filter slice, function signature should be func(index int, value interface{}) bool
-func Find(slice, function interface{}) interface{} //iterates over elements of slice, returning the first one that passes a truth test on function.function signature should be func(index int, value interface{}) bool .
+func Find(slice, function interface{}) (interface{}, bool) //iterates over elements of slice, returning the first one that passes a truth test on function.function signature should be func(index int, value interface{}) bool .
+func FlattenDeep(slice interface{}) interface{} //flattens slice recursive
 func IntSlice(slice interface{}) ([]int, error) //convert value to int slice
 func InterfaceSlice(slice interface{}) []interface{} //convert value to interface{} slice
+func Intersection(slices ...interface{}) interface{} //creates a slice of unique values that included by all slices.
 func InsertByIndex(slice interface{}, index int, value interface{}) (interface{}, error) //insert the element into slice at index.
 func Map(slice, function interface{}) interface{} //map lisce, function signature should be func(index int, value interface{}) interface{}
 func ReverseSlice(slice interface{}) //revere slice
 func Reduce(slice, function, zero interface{}) interface{} //reduce slice, function signature should be func(index int, value1, value2 interface{}) interface{}
+func Shuffle(slice interface{}) interface{} //creates an slice of shuffled values
 func SortByField(slice interface{}, field string, sortType ...string) error //sort struct slice by field
 func Some(slice, function interface{}) bool //return true if any of the values in the list pass the predicate function, function signature should be func(index int, value interface{}) bool
 func StringSlice(slice interface{}) []string //convert value to string slice
 func Unique(slice interface{}) interface{} //remove duplicate elements in slice
+func Union(slices ...interface{}) interface{} //Union creates a slice of unique values, in order, from all given slices. using == for equality comparisons.
 func UpdateByIndex(slice interface{}, index int, value interface{}) (interface{}, error) //update the slice element at index.
+func Without(slice interface{}, values ...interface{}) interface{} //creates a slice excluding all given values
+func GroupBy(slice, function interface{}) (interface{}, interface{}) // groups slice into two categories
 ```

 #### 10. strutil is for processing string
--- a/README_zh-CN.md
+++ b/README_zh-CN.md
@@ -6,7 +6,7 @@
 <div align="center" style="text-align: center;">

 ![Go version](https://img.shields.io/badge/go-%3E%3D1.16<recommend>-9cf)
-[![Release](https://img.shields.io/badge/release-1.0.10-green.svg)](https://github.com/duke-git/lancet/releases)
+[![Release](https://img.shields.io/badge/release-1.1.6-green.svg)](https://github.com/duke-git/lancet/releases)
 [![GoDoc](https://godoc.org/github.com//duke-git/lancet?status.svg)](https://pkg.go.dev/github.com/duke-git/lancet)
 [![Go Report Card](https://goreportcard.com/badge/github.com/duke-git/lancet)](https://goreportcard.com/report/github.com/duke-git/lancet)
 [![codecov](https://codecov.io/gh/duke-git/lancet/branch/main/graph/badge.svg?token=FC48T1F078)](https://codecov.io/gh/duke-git/lancet)
@@ -21,7 +21,7 @@
 ### 特性

 - 👏 全面、高效、可复用
- 💪 100+常用go工具函数，支持string、slice、datetime、net、crypt...
+- 💪 140+常用go工具函数，支持string、slice、datetime、net、crypt...
 - 💅 只依赖go标准库
 - 🌍 所有导出函数单元测试覆盖率100%

@@ -146,6 +146,8 @@ func HmacMd5(data, key string) string //获取hmac md5值
 func HmacSha1(data, key string) string //获取hmac sha1值
 func HmacSha256(data, key string) string //获取hmac sha256值
 func HmacSha512(data, key string) string //获取hmac sha512值
+func Md5String(s string) string //获取字符串md5值
+func Md5File(filename string) (string, error) //获取文件md5值
 func Sha1(data string) string //获取sha1值
 func Sha256(data string) string //获取sha256值
 func Sha512(data string) string //获取sha512值
@@ -277,6 +279,10 @@ func (f Fn) Curry(i interface{}) func(...interface{}) interface{}  //函数柯
 func Compose(fnList ...func(...interface{}) interface{}) func(...interface{}) interface{}  //从右至左组合函数
 func Delay(delay time.Duration, fn interface{}, args ...interface{})  //延迟调用函数
 func Schedule(d time.Duration, fn interface{}, args ...interface{}) chan bool //每隔duration时间调用函数, 关闭返回通道可以停止调用
+func (w *Watcher) Start() //开时watcher
+func (w *Watcher) Stop() //开时watcher
+func (w *Watcher) Reset() {} //重置代码watcher
+func (w *Watcher) GetElapsedTime() time.Duration //get code excution elapsed time.
 ```

 #### 7. netutil网络处理包
@@ -387,20 +393,27 @@ func Chunk(slice []interface{}, size int) [][]interface{} //均分slice
 func ConvertSlice(originalSlice interface{}, newSliceType reflect.Type) interface{} //将originalSlice转换为 newSliceType
 func Difference(slice1, slice2 interface{}) interface{} //返回
 func DeleteByIndex(slice interface{}, start int, end ...int) (interface{}, error) //删除切片中start到end位置的值
+func Drop(slice interface{}, n int) interface{} //创建一个新切片，当n大于0时删除原切片前n个元素，当n小于0时删除原切片后n个元素
 func Every(slice, function interface{}) bool //slice中所有元素都符合函数条件时返回true, 否则返回false. 函数签名：func(index int, value interface{}) bool
-func Find(slice, function interface{}) interface{} //查找slice中第一个符合条件的元素，函数签名：func(index int, value interface{}) bool
+func Find(slice, function interface{}) (interface{}, bool)//查找slice中第一个符合条件的元素，函数签名：func(index int, value interface{}) bool
 func Filter(slice, function interface{}) interface{} //过滤slice, 函数签名：func(index int, value interface{}) bool
+func FlattenDeep(slice interface{}) interface{} //将slice递归为一维切片。
 func IntSlice(slice interface{}) ([]int, error) //转成int切片
 func InterfaceSlice(slice interface{}) []interface{} //转成interface{}切片
+func Intersection(slices ...interface{}) interface{} //slice交集，去重
 func InsertByIndex(slice interface{}, index int, value interface{}) (interface{}, error) //在切片中index位置插入value
 func Map(slice, function interface{}) interface{} //遍历切片, 函数签名：func(index int, value interface{}) interface{}
 func ReverseSlice(slice interface{}) //反转切片
 func Reduce(slice, function, zero interface{}) interface{} //切片reduce操作， 函数签名：func(index int, value1, value2 interface{}) interface{}
+func Shuffle(slice interface{}) interface{} //创建一个被打乱值的切片
 func Some(slice, function interface{}) bool //slice中任意一个元素都符合函数条件时返回true, 否则返回false. 函数签名：func(index int, value interface{}) bool
 func SortByField(slice interface{}, field string, sortType ...string) error //对struct切片进行排序
 func StringSlice(slice interface{}) []string //转为string切片
 func Unique(slice interface{}) interface{} //去重切片
+func Union(slices ...interface{}) interface{} //slice并集, 去重
 func UpdateByIndex(slice interface{}, index int, value interface{}) (interface{}, error) //在切片中index位置更新value
+func Without(slice interface{}, values ...interface{}) interface{} //slice去除values
+func GroupBy(slice, function interface{}) (interface{}, interface{}) //根据函数function的逻辑分slice为两组slice
 ```

 #### 10. strutil字符串处理包
--- a/convertor/convertor.go
+++ b/convertor/convertor.go
@@ -45,44 +45,34 @@ func ToChar(s string) []string {

 // ToString convert value to string
 func ToString(value interface{}) string {
-	var res string
+	res := ""
 	if value == nil {
 		return res
 	}
-	switch v := value.(type) {
-	case float64:
-		res = strconv.FormatFloat(v, 'f', -1, 64)
-	case float32:
-		res = strconv.FormatFloat(float64(v), 'f', -1, 64)
-	case int:
-		res = strconv.Itoa(v)
-	case uint:
-		res = strconv.Itoa(int(v))
-	case int8:
-		res = strconv.Itoa(int(v))
-	case uint8:
-		res = strconv.Itoa(int(v))
-	case int16:
-		res = strconv.Itoa(int(v))
-	case uint16:
-		res = strconv.Itoa(int(v))
-	case int32:
-		res = strconv.Itoa(int(v))
-	case uint32:
-		res = strconv.Itoa(int(v))
-	case int64:
-		res = strconv.FormatInt(v, 10)
-	case uint64:
-		res = strconv.FormatUint(v, 10)
+
+	v := reflect.ValueOf(value)
+
+	switch value.(type) {
+	case float32, float64:
+		res = strconv.FormatFloat(v.Float(), 'f', -1, 64)
+		return res
+	case int, int8, int16, int32, int64:
+		res = strconv.FormatInt(v.Int(), 10)
+		return res
+	case uint, uint8, uint16, uint32, uint64:
+		res = strconv.FormatUint(v.Uint(), 10)
+		return res
 	case string:
-		res = value.(string)
+		res = v.String()
+		return res
 	case []byte:
-		res = string(value.([]byte))
+		res = string(v.Bytes())
+		return res
 	default:
 		newValue, _ := json.Marshal(value)
 		res = string(newValue)
+		return res
 	}
-	return res
 }

 // ToJson convert value to a valid json string
--- a/convertor/convertor_test.go
+++ b/convertor/convertor_test.go
@@ -5,7 +5,7 @@ import (
 	"reflect"
 	"testing"

-	"github.com/duke-git/lancet/utils"
+	"github.com/duke-git/lancet/internal"
 )

 func TestToChar(t *testing.T) {
@@ -18,7 +18,7 @@ func TestToChar(t *testing.T) {
 	for i := 0; i < len(cases); i++ {
 		res := ToChar(cases[i])
 		if !reflect.DeepEqual(res, expected[i]) {
-			utils.LogFailedTestInfo(t, "ToChar", cases[i], expected[i], res)
+			internal.LogFailedTestInfo(t, "ToChar", cases[i], expected[i], res)
 			t.FailNow()
 		}
 	}
@@ -31,7 +31,7 @@ func TestToBool(t *testing.T) {
 	for i := 0; i < len(cases); i++ {
 		res, _ := ToBool(cases[i])
 		if res != expected[i] {
-			utils.LogFailedTestInfo(t, "ToBool", cases[i], expected[i], res)
+			internal.LogFailedTestInfo(t, "ToBool", cases[i], expected[i], res)
 			t.FailNow()
 		}
 	}
@@ -52,7 +52,7 @@ func TestToBytes(t *testing.T) {
 		res, _ := ToBytes(cases[i])
 		fmt.Println(res)
 		if !reflect.DeepEqual(res, expected[i]) {
-			utils.LogFailedTestInfo(t, "ToBytes", cases[i], expected[i], res)
+			internal.LogFailedTestInfo(t, "ToBytes", cases[i], expected[i], res)
 			t.FailNow()
 		}
 	}
@@ -69,7 +69,7 @@ func TestToInt(t *testing.T) {
 	for i := 0; i < len(cases); i++ {
 		res, _ := ToInt(cases[i])
 		if res != expected[i] {
-			utils.LogFailedTestInfo(t, "ToInt", cases[i], expected[i], res)
+			internal.LogFailedTestInfo(t, "ToInt", cases[i], expected[i], res)
 			t.FailNow()
 		}
 	}
@@ -88,7 +88,7 @@ func TestToFloat(t *testing.T) {
 	for i := 0; i < len(cases); i++ {
 		res, _ := ToFloat(cases[i])
 		if res != expected[i] {
-			utils.LogFailedTestInfo(t, "ToFloat", cases[i], expected[i], res)
+			internal.LogFailedTestInfo(t, "ToFloat", cases[i], expected[i], res)
 			t.FailNow()
 		}
 	}
@@ -108,20 +108,25 @@ func TestToString(t *testing.T) {
 	aStruct := TestStruct{Name: "TestStruct"}

 	cases := []interface{}{
+		"", nil,
 		int(0), int8(1), int16(-1), int32(123), int64(123),
 		uint(123), uint8(123), uint16(123), uint32(123), uint64(123),
 		float64(12.3), float32(12.3),
 		true, false,
 		[]int{1, 2, 3}, aMap, aStruct, []byte{104, 101, 108, 108, 111}}

-	expected := []string{"0", "1", "-1", "123", "123", "123", "123", "123",
-		"123", "123", "12.3", "12.300000190734863", "true", "false",
+	expected := []string{
+		"", "",
+		"0", "1", "-1",
+		"123", "123", "123", "123", "123", "123", "123",
+		"12.3", "12.300000190734863",
+		"true", "false",
 		"[1,2,3]", "{\"a\":1,\"b\":2,\"c\":3}", "{\"Name\":\"TestStruct\"}", "hello"}

 	for i := 0; i < len(cases); i++ {
 		res := ToString(cases[i])
 		if res != expected[i] {
-			utils.LogFailedTestInfo(t, "ToString", cases[i], expected[i], res)
+			internal.LogFailedTestInfo(t, "ToString", cases[i], expected[i], res)
 			t.FailNow()
 		}
 	}
@@ -136,7 +141,7 @@ func TestToJson(t *testing.T) {
 	mapJson := "{\"a\":1,\"b\":2,\"c\":3}"
 	r1, _ := ToJson(aMap)
 	if r1 != mapJson {
-		utils.LogFailedTestInfo(t, "ToJson", aMap, mapJson, r1)
+		internal.LogFailedTestInfo(t, "ToJson", aMap, mapJson, r1)
 		t.FailNow()
 	}

@@ -148,7 +153,7 @@ func TestToJson(t *testing.T) {
 	structJson := "{\"Name\":\"TestStruct\"}"
 	r2, _ := ToJson(aStruct)
 	if r2 != structJson {
-		utils.LogFailedTestInfo(t, "ToJson", aMap, mapJson, r1)
+		internal.LogFailedTestInfo(t, "ToJson", aMap, mapJson, r1)
 		t.FailNow()
 	}
 }
@@ -170,7 +175,7 @@ func TestStructToMap(t *testing.T) {
 	//exp1["100"] = 100

 	if !reflect.DeepEqual(pm1, m1) {
-		utils.LogFailedTestInfo(t, "StructToMap", p1, m1, pm1)
+		internal.LogFailedTestInfo(t, "StructToMap", p1, m1, pm1)
 		t.FailNow()
 	}

@@ -185,7 +190,7 @@ func TestStructToMap(t *testing.T) {
 	m2["100"] = 100

 	if reflect.DeepEqual(pm2, m2) {
-		utils.LogFailedTestInfo(t, "StructToMap", p2, m2, pm2)
+		internal.LogFailedTestInfo(t, "StructToMap", p2, m2, pm2)
 		t.FailNow()
 	}
 }
@@ -197,7 +202,7 @@ func TestColorHexToRGB(t *testing.T) {
 	expected := "0,51,102"

 	if colorRGB != expected {
-		utils.LogFailedTestInfo(t, "ColorHexToRGB", colorHex, expected, colorRGB)
+		internal.LogFailedTestInfo(t, "ColorHexToRGB", colorHex, expected, colorRGB)
 		t.FailNow()
 	}
 }
@@ -211,7 +216,7 @@ func TestColorRGBToHex(t *testing.T) {
 	expected := "#003366"

 	if colorHex != expected {
-		utils.LogFailedTestInfo(t, "ColorHexToRGB", colorRGB, expected, colorHex)
+		internal.LogFailedTestInfo(t, "ColorHexToRGB", colorRGB, expected, colorHex)
 		t.FailNow()
 	}
 }
--- a/cryptor/aes_test.go
+++ b/cryptor/aes_test.go
@@ -3,7 +3,7 @@ package cryptor
 import (
 	"testing"

-	"github.com/duke-git/lancet/utils"
+	"github.com/duke-git/lancet/internal"
 )

 func TestAesEcbEncrypt(t *testing.T) {
@@ -14,7 +14,7 @@ func TestAesEcbEncrypt(t *testing.T) {
 	aesEcbDecrypt := AesEcbDecrypt(aesEcbEncrypt, []byte(key))

 	if string(aesEcbDecrypt) != data {
-		utils.LogFailedTestInfo(t, "AesEcbEncrypt/AesEcbDecrypt", data, data, string(aesEcbDecrypt))
+		internal.LogFailedTestInfo(t, "AesEcbEncrypt/AesEcbDecrypt", data, data, string(aesEcbDecrypt))
 		t.FailNow()
 	}
 }
@@ -27,7 +27,7 @@ func TestAesCbcEncrypt(t *testing.T) {
 	aesCbcDecrypt := AesCbcDecrypt(aesCbcEncrypt, []byte(key))

 	if string(aesCbcDecrypt) != data {
-		utils.LogFailedTestInfo(t, "AesCbcEncrypt/AesCbcDecrypt", data, data, string(aesCbcDecrypt))
+		internal.LogFailedTestInfo(t, "AesCbcEncrypt/AesCbcDecrypt", data, data, string(aesCbcDecrypt))
 		t.FailNow()
 	}
 }
@@ -40,7 +40,7 @@ func TestAesCtrCrypt(t *testing.T) {
 	aesCtrDeCrypt := AesCtrCrypt(aesCtrCrypt, []byte(key))

 	if string(aesCtrDeCrypt) != data {
-		utils.LogFailedTestInfo(t, "AesCtrCrypt", data, data, string(aesCtrDeCrypt))
+		internal.LogFailedTestInfo(t, "AesCtrCrypt", data, data, string(aesCtrDeCrypt))
 		t.FailNow()
 	}
 }
@@ -53,7 +53,7 @@ func TestAesCfbEncrypt(t *testing.T) {
 	aesCfbDecrypt := AesCfbDecrypt(aesCfbEncrypt, []byte(key))

 	if string(aesCfbDecrypt) != data {
-		utils.LogFailedTestInfo(t, "AesCfbEncrypt/AesCfbDecrypt", data, data, string(aesCfbDecrypt))
+		internal.LogFailedTestInfo(t, "AesCfbEncrypt/AesCfbDecrypt", data, data, string(aesCfbDecrypt))
 		t.FailNow()
 	}
 }
@@ -66,7 +66,7 @@ func TestAesOfbEncrypt(t *testing.T) {
 	aesOfbDecrypt := AesOfbDecrypt(aesOfbEncrypt, []byte(key))

 	if string(aesOfbDecrypt) != data {
-		utils.LogFailedTestInfo(t, "AesOfbEncrypt/AesOfbDecrypt", data, data, string(aesOfbDecrypt))
+		internal.LogFailedTestInfo(t, "AesOfbEncrypt/AesOfbDecrypt", data, data, string(aesOfbDecrypt))
 		t.FailNow()
 	}
 }
--- a/cryptor/basic_test.go
+++ b/cryptor/basic_test.go
@@ -5,7 +5,7 @@ import (
 	"os"
 	"testing"

-	"github.com/duke-git/lancet/utils"
+	"github.com/duke-git/lancet/internal"
 )

 func TestBase64StdEncode(t *testing.T) {
@@ -13,7 +13,7 @@ func TestBase64StdEncode(t *testing.T) {
 	bs := Base64StdEncode(s)

 	if bs != "aGVsbG8gd29ybGQ=" {
-		utils.LogFailedTestInfo(t, "Base64StdEncode", s, "aGVsbG8gd29ybGQ=", bs)
+		internal.LogFailedTestInfo(t, "Base64StdEncode", s, "aGVsbG8gd29ybGQ=", bs)
 		t.FailNow()
 	}
 }
@@ -23,7 +23,7 @@ func TestBase64StdDecode(t *testing.T) {
 	s := Base64StdDecode(bs)

 	if s != "hello world" {
-		utils.LogFailedTestInfo(t, "Base64StdDecode", bs, "hello world=", s)
+		internal.LogFailedTestInfo(t, "Base64StdDecode", bs, "hello world=", s)
 		t.FailNow()
 	}
 }
@@ -34,7 +34,7 @@ func TestMd5String(t *testing.T) {
 	expected := "5d41402abc4b2a76b9719d911017c592"

 	if smd5 != expected {
-		utils.LogFailedTestInfo(t, "Md5String", s, expected, smd5)
+		internal.LogFailedTestInfo(t, "Md5String", s, expected, smd5)
 		t.FailNow()
 	}
 }
@@ -58,7 +58,7 @@ func TestHmacMd5(t *testing.T) {
 	expected := "5f4c9faaff0a1ad3007d9ddc06abe36d"

 	if hmacMd5 != expected {
-		utils.LogFailedTestInfo(t, "HmacMd5", s, expected, hmacMd5)
+		internal.LogFailedTestInfo(t, "HmacMd5", s, expected, hmacMd5)
 		t.FailNow()
 	}
 }
@@ -70,7 +70,7 @@ func TestHmacSha1(t *testing.T) {
 	expected := "3826f812255d8683f051ee97346d1359234d5dbd"

 	if hmacSha1 != expected {
-		utils.LogFailedTestInfo(t, "HmacSha1", s, expected, hmacSha1)
+		internal.LogFailedTestInfo(t, "HmacSha1", s, expected, hmacSha1)
 		t.FailNow()
 	}
 }
@@ -82,7 +82,7 @@ func TestHmacSha256(t *testing.T) {
 	expected := "9dce2609f2d67d41f74c7f9efc8ccd44370d41ad2de52982627588dfe7289ab8"

 	if hmacSha256 != expected {
-		utils.LogFailedTestInfo(t, "HmacSha256", s, expected, hmacSha256)
+		internal.LogFailedTestInfo(t, "HmacSha256", s, expected, hmacSha256)
 		t.FailNow()
 	}
 }
@@ -94,7 +94,7 @@ func TestHmacSha512(t *testing.T) {
 	expected := "5b1563ac4e9b49c9ada8ccb232588fc4f0c30fd12f756b3a0b95af4985c236ca60925253bae10ce2c6bf9af1c1679b51e5395ff3d2826c0a2c7c0d72225d4175"

 	if hmacSha512 != expected {
-		utils.LogFailedTestInfo(t, "HmacSha512", s, expected, hmacSha512)
+		internal.LogFailedTestInfo(t, "HmacSha512", s, expected, hmacSha512)
 		t.FailNow()
 	}
 }
@@ -105,7 +105,7 @@ func TestSha1(t *testing.T) {
 	expected := "2aae6c35c94fcfb415dbe95f408b9ce91ee846ed"

 	if sha1 != expected {
-		utils.LogFailedTestInfo(t, "Sha1", s, expected, sha1)
+		internal.LogFailedTestInfo(t, "Sha1", s, expected, sha1)
 		t.FailNow()
 	}
 }
@@ -116,7 +116,7 @@ func TestSha256(t *testing.T) {
 	expected := "b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9"

 	if sha256 != expected {
-		utils.LogFailedTestInfo(t, "Sha256", s, expected, sha256)
+		internal.LogFailedTestInfo(t, "Sha256", s, expected, sha256)
 		t.FailNow()
 	}
 }
@@ -127,7 +127,7 @@ func TestSha512(t *testing.T) {
 	expected := "309ecc489c12d6eb4cc40f50c902f2b4d0ed77ee511a7c7a9bcd3ca86d4cd86f989dd35bc5ff499670da34255b45b0cfd830e81f605dcf7dc5542e93ae9cd76f"

 	if sha512 != expected {
-		utils.LogFailedTestInfo(t, "Sha512", s, expected, sha512)
+		internal.LogFailedTestInfo(t, "Sha512", s, expected, sha512)
 		t.FailNow()
 	}
 }
--- a/cryptor/des_test.go
+++ b/cryptor/des_test.go
@@ -3,7 +3,7 @@ package cryptor
 import (
 	"testing"

-	"github.com/duke-git/lancet/utils"
+	"github.com/duke-git/lancet/internal"
 )

 func TestDesEcbEncrypt(t *testing.T) {
@@ -14,7 +14,7 @@ func TestDesEcbEncrypt(t *testing.T) {
 	desEcbDecrypt := DesEcbDecrypt(desEcbEncrypt, []byte(key))

 	if string(desEcbDecrypt) != data {
-		utils.LogFailedTestInfo(t, "DesEcbEncrypt/DesEcbDecrypt", data, data, string(desEcbDecrypt))
+		internal.LogFailedTestInfo(t, "DesEcbEncrypt/DesEcbDecrypt", data, data, string(desEcbDecrypt))
 		t.FailNow()
 	}
 }
@@ -27,7 +27,7 @@ func TestDesCbcEncrypt(t *testing.T) {
 	desCbcDecrypt := DesCbcDecrypt(desCbcEncrypt, []byte(key))

 	if string(desCbcDecrypt) != data {
-		utils.LogFailedTestInfo(t, "DesCbcEncrypt/DesCbcDecrypt", data, data, string(desCbcDecrypt))
+		internal.LogFailedTestInfo(t, "DesCbcEncrypt/DesCbcDecrypt", data, data, string(desCbcDecrypt))
 		t.FailNow()
 	}
 }
@@ -40,7 +40,7 @@ func TestDesCtrCrypt(t *testing.T) {
 	desCtrDeCrypt := DesCtrCrypt(desCtrCrypt, []byte(key))

 	if string(desCtrDeCrypt) != data {
-		utils.LogFailedTestInfo(t, "DesCtrCrypt", data, data, string(desCtrDeCrypt))
+		internal.LogFailedTestInfo(t, "DesCtrCrypt", data, data, string(desCtrDeCrypt))
 		t.FailNow()
 	}
 }
@@ -53,7 +53,7 @@ func TestDesCfbEncrypt(t *testing.T) {
 	desCfbDecrypt := DesCfbDecrypt(desCfbEncrypt, []byte(key))

 	if string(desCfbDecrypt) != data {
-		utils.LogFailedTestInfo(t, "DesCfbEncrypt/DesCfbDecrypt", data, data, string(desCfbDecrypt))
+		internal.LogFailedTestInfo(t, "DesCfbEncrypt/DesCfbDecrypt", data, data, string(desCfbDecrypt))
 		t.FailNow()
 	}
 }
@@ -66,7 +66,7 @@ func TestDesOfbEncrypt(t *testing.T) {
 	desOfbDecrypt := DesOfbDecrypt(desOfbEncrypt, []byte(key))

 	if string(desOfbDecrypt) != data {
-		utils.LogFailedTestInfo(t, "DesOfbEncrypt/DesOfbDecrypt", data, data, string(desOfbDecrypt))
+		internal.LogFailedTestInfo(t, "DesOfbEncrypt/DesOfbDecrypt", data, data, string(desOfbDecrypt))
 		t.FailNow()
 	}
 }
--- a/cryptor/rsa_test.go
+++ b/cryptor/rsa_test.go
@@ -3,7 +3,7 @@ package cryptor
 import (
 	"testing"

-	"github.com/duke-git/lancet/utils"
+	"github.com/duke-git/lancet/internal"
 )

 func TestRsaEncrypt(t *testing.T) {
@@ -13,7 +13,7 @@ func TestRsaEncrypt(t *testing.T) {
 	decrypted := RsaDecrypt(encrypted, "rsa_private.pem")

 	if string(data) != string(decrypted) {
-		utils.LogFailedTestInfo(t, "RsaEncrypt/RsaDecrypt", string(data), string(data), string(decrypted))
+		internal.LogFailedTestInfo(t, "RsaEncrypt/RsaDecrypt", string(data), string(data), string(decrypted))
 		t.FailNow()
 	}
 }
--- a/datetime/datetime.go
+++ b/datetime/datetime.go
@@ -25,7 +25,7 @@
 package datetime

 import (
-	"strconv"
+	"fmt"
 	"time"
 )

@@ -56,24 +56,17 @@ func init() {

 // AddMinute add or sub minute to the time
 func AddMinute(t time.Time, minute int64) time.Time {
-	s := strconv.FormatInt(minute, 10)
-	m, _ := time.ParseDuration(s + "m")
-	return t.Add(m)
+	return t.Add(time.Minute * time.Duration(minute))
 }

 // AddHour add or sub hour to the time
 func AddHour(t time.Time, hour int64) time.Time {
-	s := strconv.FormatInt(hour, 10)
-	h, _ := time.ParseDuration(s + "h")
-	return t.Add(h)
+	return t.Add(time.Hour * time.Duration(hour))
 }

 // AddDay add or sub day to the time
 func AddDay(t time.Time, day int64) time.Time {
-	dayHours := day * 24
-	d := strconv.FormatInt(dayHours, 10)
-	h, _ := time.ParseDuration(d + "h")
-	return t.Add(h)
+	return t.Add(24 * time.Hour * time.Duration(day))
 }

 // GetNowDate return format yyyy-mm-dd of current date
@@ -109,7 +102,11 @@ func FormatTimeToStr(t time.Time, format string) string {
 }

 // FormatStrToTime convert string to time
-func FormatStrToTime(str, format string) time.Time {
-	t, _ := time.Parse(timeFormat[format], str)
-	return t
+func FormatStrToTime(str, format string) (time.Time, error) {
+	v, ok := timeFormat[format]
+	if !ok {
+		return time.Time{}, fmt.Errorf("format %s not found", format)
+	}
+
+	return time.Parse(v, str)
 }
--- a/datetime/datetime_test.go
+++ b/datetime/datetime_test.go
@@ -1,7 +1,7 @@
 package datetime

 import (
-	"github.com/duke-git/lancet/utils"
+	"github.com/duke-git/lancet/internal"
 	"testing"
 	"time"
 )
@@ -12,14 +12,14 @@ func TestAddDay(t *testing.T) {
 	after2Days := AddDay(now, 2)
 	diff1 := after2Days.Sub(now)
 	if diff1.Hours() != 48 {
-		utils.LogFailedTestInfo(t, "AddDay", now, 48, diff1.Hours())
+		internal.LogFailedTestInfo(t, "AddDay", now, 48, diff1.Hours())
 		t.FailNow()
 	}

 	before2Days := AddDay(now, -2)
 	diff2 := before2Days.Sub(now)
 	if diff2.Hours() != -48 {
-		utils.LogFailedTestInfo(t, "AddDay", now, -48, diff2.Hours())
+		internal.LogFailedTestInfo(t, "AddDay", now, -48, diff2.Hours())
 		t.FailNow()
 	}

@@ -30,14 +30,14 @@ func TestAddHour(t *testing.T) {
 	after2Hours := AddHour(now, 2)
 	diff1 := after2Hours.Sub(now)
 	if diff1.Hours() != 2 {
-		utils.LogFailedTestInfo(t, "AddHour", now, 2, diff1.Hours())
+		internal.LogFailedTestInfo(t, "AddHour", now, 2, diff1.Hours())
 		t.FailNow()
 	}

 	before2Hours := AddHour(now, -2)
 	diff2 := before2Hours.Sub(now)
 	if diff2.Hours() != -2 {
-		utils.LogFailedTestInfo(t, "AddHour", now, -2, diff2.Hours())
+		internal.LogFailedTestInfo(t, "AddHour", now, -2, diff2.Hours())
 		t.FailNow()
 	}
 }
@@ -48,14 +48,14 @@ func TestAddMinute(t *testing.T) {
 	after2Minutes := AddMinute(now, 2)
 	diff1 := after2Minutes.Sub(now)
 	if diff1.Minutes() != 2 {
-		utils.LogFailedTestInfo(t, "AddMinute", now, 2, diff1.Minutes())
+		internal.LogFailedTestInfo(t, "AddMinute", now, 2, diff1.Minutes())
 		t.FailNow()
 	}

 	before2Minutes := AddMinute(now, -2)
 	diff2 := before2Minutes.Sub(now)
 	if diff2.Minutes() != -2 {
-		utils.LogFailedTestInfo(t, "AddMinute", now, -2, diff2.Minutes())
+		internal.LogFailedTestInfo(t, "AddMinute", now, -2, diff2.Minutes())
 		t.FailNow()
 	}
 }
@@ -64,7 +64,7 @@ func TestGetNowDate(t *testing.T) {
 	date := GetNowDate()
 	expected := time.Now().Format("2006-01-02")
 	if date != expected {
-		utils.LogFailedTestInfo(t, "GetNowDate", "", expected, date)
+		internal.LogFailedTestInfo(t, "GetNowDate", "", expected, date)
 		t.FailNow()
 	}
 }
@@ -73,7 +73,7 @@ func TestGetNotTime(t *testing.T) {
 	ts := GetNowTime()
 	expected := time.Now().Format("15:04:05")
 	if ts != expected {
-		utils.LogFailedTestInfo(t, "GetNowTime", "", expected, ts)
+		internal.LogFailedTestInfo(t, "GetNowTime", "", expected, ts)
 		t.FailNow()
 	}
 }
@@ -82,7 +82,7 @@ func TestGetNowDateTime(t *testing.T) {
 	ts := GetNowDateTime()
 	expected := time.Now().Format("2006-01-02 15:04:05")
 	if ts != expected {
-		utils.LogFailedTestInfo(t, "GetNowDateTime", "", expected, ts)
+		internal.LogFailedTestInfo(t, "GetNowDateTime", "", expected, ts)
 		t.FailNow()
 	}
 }
@@ -112,7 +112,7 @@ func TestFormatTimeToStr(t *testing.T) {
 	for i := 0; i < len(cases); i++ {
 		res := FormatTimeToStr(datetime, cases[i])
 		if res != expected[i] {
-			utils.LogFailedTestInfo(t, "FormatTimeToStr", cases[i], expected[i], res)
+			internal.LogFailedTestInfo(t, "FormatTimeToStr", cases[i], expected[i], res)
 			t.FailNow()
 		}
 	}
@@ -135,10 +135,13 @@ func TestFormatStrToTime(t *testing.T) {
 		"2021/01"}

 	for i := 0; i < len(cases); i++ {
-		res := FormatStrToTime(datetimeStr[i], cases[i])
+		res, err := FormatStrToTime(datetimeStr[i], cases[i])
+		if err != nil {
+			t.Fatal(err)
+		}
 		expected, _ := time.Parse(formats[i], datetimeStr[i])
 		if res != expected {
-			utils.LogFailedTestInfo(t, "FormatTimeToStr", cases[i], expected, res)
+			internal.LogFailedTestInfo(t, "FormatTimeToStr", cases[i], expected, res)
 			t.FailNow()
 		}
 	}
--- a/fileutil/file_test.go
+++ b/fileutil/file_test.go
@@ -5,7 +5,7 @@ import (
 	"reflect"
 	"testing"

-	"github.com/duke-git/lancet/utils"
+	"github.com/duke-git/lancet/internal"
 )

 func TestIsExist(t *testing.T) {
@@ -15,7 +15,7 @@ func TestIsExist(t *testing.T) {
 	for i := 0; i < len(cases); i++ {
 		res := IsExist(cases[i])
 		if res != expected[i] {
-			utils.LogFailedTestInfo(t, "IsExist", cases[i], expected[i], res)
+			internal.LogFailedTestInfo(t, "IsExist", cases[i], expected[i], res)
 			t.FailNow()
 		}
 	}
@@ -26,15 +26,15 @@ func TestCreateFile(t *testing.T) {
 	if CreateFile(f) {
 		file, err := os.Open(f)
 		if err != nil {
-			utils.LogFailedTestInfo(t, "CreateFile", f, f, "create file error: "+err.Error())
+			internal.LogFailedTestInfo(t, "CreateFile", f, f, "create file error: "+err.Error())
 			t.FailNow()
 		}
 		if file.Name() != f {
-			utils.LogFailedTestInfo(t, "CreateFile", f, f, file.Name())
+			internal.LogFailedTestInfo(t, "CreateFile", f, f, file.Name())
 			t.FailNow()
 		}
 	} else {
-		utils.LogFailedTestInfo(t, "CreateFile", f, f, "create file error")
+		internal.LogFailedTestInfo(t, "CreateFile", f, f, "create file error")
 		t.FailNow()
 	}
 }
@@ -46,7 +46,7 @@ func TestIsDir(t *testing.T) {
 	for i := 0; i < len(cases); i++ {
 		res := IsDir(cases[i])
 		if res != expected[i] {
-			utils.LogFailedTestInfo(t, "IsDir", cases[i], expected[i], res)
+			internal.LogFailedTestInfo(t, "IsDir", cases[i], expected[i], res)
 			t.FailNow()
 		}
 	}
@@ -57,11 +57,11 @@ func TestRemoveFile(t *testing.T) {
 	if CreateFile(f) {
 		err := RemoveFile(f)
 		if err != nil {
-			utils.LogFailedTestInfo(t, "RemoveFile", f, f, err.Error())
+			internal.LogFailedTestInfo(t, "RemoveFile", f, f, err.Error())
 			t.FailNow()
 		}
 	} else {
-		utils.LogFailedTestInfo(t, "RemoveFile", f, f, "create file error")
+		internal.LogFailedTestInfo(t, "RemoveFile", f, f, "create file error")
 		t.FailNow()
 	}
 }
@@ -76,11 +76,11 @@ func TestCopyFile(t *testing.T) {
 	if err != nil {
 		file, err := os.Open(dstFile)
 		if err != nil {
-			utils.LogFailedTestInfo(t, "CopyFile", srcFile, dstFile, "create file error: "+err.Error())
+			internal.LogFailedTestInfo(t, "CopyFile", srcFile, dstFile, "create file error: "+err.Error())
 			t.FailNow()
 		}
 		if file.Name() != dstFile {
-			utils.LogFailedTestInfo(t, "CopyFile", srcFile, dstFile, file.Name())
+			internal.LogFailedTestInfo(t, "CopyFile", srcFile, dstFile, file.Name())
 			t.FailNow()
 		}
 	}
@@ -93,7 +93,7 @@ func TestListFileNames(t *testing.T) {
 	}
 	expected := []string{"datetime.go", "datetime_test.go"}
 	if !reflect.DeepEqual(filesInCurrentPath, expected) {
-		utils.LogFailedTestInfo(t, "ToChar", "./", expected, filesInCurrentPath)
+		internal.LogFailedTestInfo(t, "ToChar", "./", expected, filesInCurrentPath)
 		t.FailNow()
 	}
 }
@@ -106,7 +106,7 @@ func TestReadFileToString(t *testing.T) {

 	res, _ := ReadFileToString(path)
 	if res != "hello world" {
-		utils.LogFailedTestInfo(t, "ReadFileToString", path, "hello world", res)
+		internal.LogFailedTestInfo(t, "ReadFileToString", path, "hello world", res)
 	}
 }

@@ -120,7 +120,7 @@ func TestClearFile(t *testing.T) {

 	res, _ := ReadFileToString(path)
 	if res != "" {
-		utils.LogFailedTestInfo(t, "CreateFile", path, "", res)
+		internal.LogFailedTestInfo(t, "CreateFile", path, "", res)
 	}
 }

@@ -133,6 +133,6 @@ func TestReadFileByLine(t *testing.T) {
 	expected := []string{"hello", "world"}
 	res, _ := ReadFileByLine(path)
 	if !reflect.DeepEqual(res, expected) {
-		utils.LogFailedTestInfo(t, "ReadFileByLine", path, expected, res)
+		internal.LogFailedTestInfo(t, "ReadFileByLine", path, expected, res)
 	}
-}
+}
--- a/formatter/formatter_test.go
+++ b/formatter/formatter_test.go
@@ -3,7 +3,7 @@ package formatter
 import (
 	"testing"

-	"github.com/duke-git/lancet/utils"
+	"github.com/duke-git/lancet/internal"
 )

 func TestComma(t *testing.T) {
@@ -22,7 +22,7 @@ func TestComma(t *testing.T) {
 func comma(t *testing.T, test interface{}, symbol string, expected interface{}) {
 	res := Comma(test, symbol)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "Comma", test, expected, res)
+		internal.LogFailedTestInfo(t, "Comma", test, expected, res)
 		t.FailNow()
 	}
 }
--- a/function/function.go
+++ b/function/function.go
@@ -2,7 +2,6 @@
 // Use of this source code is governed by MIT license

 // Package function implements some functions for control the function execution and some is for functional programming.
-
 package function

 import (
@@ -12,10 +11,12 @@ import (

 // After creates a function that invokes func once it's called n or more times
 func After(n int, fn interface{}) func(args ...interface{}) []reflect.Value {
+	// Catch programming error while constructing the closure
+	mustBeFunction(fn)
 	return func(args ...interface{}) []reflect.Value {
 		n--
 		if n < 1 {
-			return invokeFunc(fn, args...)
+			return unsafeInvokeFunc(fn, args...)
 		}
 		return nil
 	}
@@ -23,11 +24,12 @@ func After(n int, fn interface{}) func(args ...interface{}) []reflect.Value {

 // Before creates a function that invokes func once it's called less than n times
 func Before(n int, fn interface{}) func(args ...interface{}) []reflect.Value {
+	// Catch programming error while constructing the closure
+	mustBeFunction(fn)
 	var res []reflect.Value
-
 	return func(args ...interface{}) []reflect.Value {
 		if n > 0 {
-			res = invokeFunc(fn, args...)
+			res = unsafeInvokeFunc(fn, args...)
 		}
 		if n <= 0 {
 			fn = nil
@@ -37,9 +39,10 @@ func Before(n int, fn interface{}) func(args ...interface{}) []reflect.Value {
 	}
 }

+// Fn is for curry function which is func(...interface{}) interface{}
 type Fn func(...interface{}) interface{}

-// Curry make a curryed function
+// Curry make a curry function
 func (f Fn) Curry(i interface{}) func(...interface{}) interface{} {
 	return func(values ...interface{}) interface{} {
 		v := append([]interface{}{i}, values...)
@@ -49,7 +52,7 @@ func (f Fn) Curry(i interface{}) func(...interface{}) interface{} {

 // Compose compose the functions from right to left
 func Compose(fnList ...func(...interface{}) interface{}) func(...interface{}) interface{} {
-	return func(s... interface{}) interface{} {
+	return func(s ...interface{}) interface{} {
 		f := fnList[0]
 		restFn := fnList[1:]

@@ -61,7 +64,6 @@ func Compose(fnList ...func(...interface{}) interface{}) func(...interface{}) in
 	}
 }

-
 // Delay make the function execution after delayed time
 func Delay(delay time.Duration, fn interface{}, args ...interface{}) {
 	time.Sleep(delay)
@@ -70,11 +72,12 @@ func Delay(delay time.Duration, fn interface{}, args ...interface{}) {

 // Schedule invoke function every duration time, util close the returned bool chan
 func Schedule(d time.Duration, fn interface{}, args ...interface{}) chan bool {
+	// Catch programming error while constructing the closure
+	mustBeFunction(fn)
 	quit := make(chan bool)
-
 	go func() {
 		for {
-			invokeFunc(fn, args...)
+			unsafeInvokeFunc(fn, args...)
 			select {
 			case <-time.After(d):
 			case <-quit:
--- a/function/function_util.go
+++ b/function/function_util.go
@@ -14,6 +14,15 @@ func invokeFunc(fn interface{}, args ...interface{}) []reflect.Value {
 	return fv.Call(params)
 }

+func unsafeInvokeFunc(fn interface{}, args ...interface{}) []reflect.Value {
+	fv := reflect.ValueOf(fn)
+	params := make([]reflect.Value, len(args))
+	for i, item := range args {
+		params[i] = reflect.ValueOf(item)
+	}
+	return fv.Call(params)
+}
+
 func functionValue(function interface{}) reflect.Value {
 	v := reflect.ValueOf(function)
 	if v.Kind() != reflect.Func {
@@ -21,3 +30,10 @@ func functionValue(function interface{}) reflect.Value {
 	}
 	return v
 }
+
+func mustBeFunction(function interface{}) {
+	v := reflect.ValueOf(function)
+	if v.Kind() != reflect.Func {
+		panic(fmt.Sprintf("Invalid function type, value of type %T", function))
+	}
+}
--- a/function/watcher.go
+++ b/function/watcher.go
@@ -0,0 +1,37 @@
+package function
+
+import "time"
+
+// Watcher is used for record code excution time
+type Watcher struct {
+	startTime int64
+	stopTime  int64
+	excuting  bool
+}
+
+// Start the watch timer.
+func (w *Watcher) Start() {
+	w.startTime = time.Now().UnixNano()
+	w.excuting = true
+}
+
+// Stop the watch timer.
+func (w *Watcher) Stop() {
+	w.stopTime = time.Now().UnixNano()
+	w.excuting = false
+}
+
+// GetElapsedTime get excute elapsed time.
+func (w *Watcher) GetElapsedTime() time.Duration {
+	if w.excuting {
+		return time.Duration(time.Now().UnixNano() - w.startTime)
+	}
+	return time.Duration(w.stopTime - w.startTime)
+}
+
+// Reset the watch timer.
+func (w *Watcher) Reset() {
+	w.startTime = 0
+	w.stopTime = 0
+	w.excuting = false
+}
--- a/function/watcher_test.go
+++ b/function/watcher_test.go
@@ -0,0 +1,32 @@
+package function
+
+import (
+	"testing"
+)
+
+func TestWatcher(t *testing.T) {
+	w := &Watcher{}
+	w.Start()
+
+	longRunningTask()
+
+	if !w.excuting {
+		t.FailNow()
+	}
+
+	w.Stop()
+
+	eapsedTime := w.GetElapsedTime().Milliseconds()
+	t.Log("Elapsed Time (milsecond)", eapsedTime)
+
+	if w.excuting {
+		t.FailNow()
+	}
+}
+
+func longRunningTask() {
+	var slice []int64
+	for i := 0; i < 10000000; i++ {
+		slice = append(slice, int64(i))
+	}
+}
--- a/internal/utils.go
+++ b/internal/utils.go
@@ -1,8 +1,8 @@
 // Copyright 2021 dudaodong@gmail.com. All rights reserved.
 // Use of this source code is governed by MIT license

-// Package utils implements is for internal use.
-package utils
+// Package internal is for internal use.
+package internal

 import (
 	"fmt"
--- a/netutil/net_test.go
+++ b/netutil/net_test.go
@@ -5,14 +5,14 @@ import (
 	"net"
 	"testing"

-	"github.com/duke-git/lancet/utils"
+	"github.com/duke-git/lancet/internal"
 )

 func TestGetInternalIp(t *testing.T) {
 	internalIp := GetInternalIp()
 	ip := net.ParseIP(internalIp)
 	if ip == nil {
-		utils.LogFailedTestInfo(t, "GetInternalIp", "GetInternalIp", "", ip)
+		internal.LogFailedTestInfo(t, "GetInternalIp", "GetInternalIp", "", ip)
 		t.FailNow()
 	}
 }
@@ -40,7 +40,7 @@ func TestIsPublicIP(t *testing.T) {
 		res := IsPublicIP(ips[i])

 		if res != expected[i] {
-			utils.LogFailedTestInfo(t, "IsPublicIP", ips[i], expected[i], res)
+			internal.LogFailedTestInfo(t, "IsPublicIP", ips[i], expected[i], res)
 			t.FailNow()
 		}
 	}
--- a/netutil/request.go
+++ b/netutil/request.go
@@ -22,27 +22,27 @@ import (

 //HttpGet send get http request
 func HttpGet(url string, params ...interface{}) (*http.Response, error) {
-	return request(http.MethodGet, url, params...)
+	return doHttpRequest(http.MethodGet, url, params...)
 }

 //HttpPost send post http request
 func HttpPost(url string, params ...interface{}) (*http.Response, error) {
-	return request(http.MethodPost, url, params...)
+	return doHttpRequest(http.MethodPost, url, params...)
 }

 //HttpPut send put http request
 func HttpPut(url string, params ...interface{}) (*http.Response, error) {
-	return request(http.MethodPut, url, params...)
+	return doHttpRequest(http.MethodPut, url, params...)
 }

 //HttpDelete send delete http request
 func HttpDelete(url string, params ...interface{}) (*http.Response, error) {
-	return request(http.MethodDelete, url, params...)
+	return doHttpRequest(http.MethodDelete, url, params...)
 }

 // HttpPatch send patch http request
 func HttpPatch(url string, params ...interface{}) (*http.Response, error) {
-	return request(http.MethodPatch, url, params...)
+	return doHttpRequest(http.MethodPatch, url, params...)
 }

 // ParseHttpResponse decode http response to specified interface
--- a/netutil/request_test.go
+++ b/netutil/request_test.go
@@ -7,20 +7,16 @@ import (
 	"log"
 	"testing"

-	"github.com/duke-git/lancet/utils"
+	"github.com/duke-git/lancet/internal"
 )

 func TestHttpGet(t *testing.T) {
-	_, e := HttpGet("", nil)
-	if e == nil {
-		t.FailNow()
+	url := "https://jsonplaceholder.typicode.com/todos/1"
+	header := map[string]string{
+		"Content-Type": "application/json",
 	}

-	url := "https://gutendex.com/books?"
-	queryParams := make(map[string]interface{})
-	queryParams["ids"] = "1"
-
-	resp, err := HttpGet(url, nil, queryParams)
+	resp, err := HttpGet(url, header)
 	if err != nil {
 		log.Fatal(err)
 		t.FailNow()
@@ -28,23 +24,20 @@ func TestHttpGet(t *testing.T) {

 	body, _ := ioutil.ReadAll(resp.Body)
 	fmt.Println("response: ", resp.StatusCode, string(body))
-
 }

 func TestHttpPost(t *testing.T) {
-	url := "http://public-api-v1.aspirantzhang.com/users"
-	type User struct {
-		Name  string `json:"name"`
-		Email string `json:"email"`
-	}
-	user := User{
-		"test",
-		"test@test.com",
-	}
-	bodyParams, _ := json.Marshal(user)
+	url := "https://jsonplaceholder.typicode.com/todos"
 	header := map[string]string{
 		"Content-Type": "application/json",
 	}
+	type Todo struct {
+		UserId int    `json:"userId"`
+		Title  string `json:"title"`
+	}
+	todo := Todo{1, "TestAddToDo"}
+	bodyParams, _ := json.Marshal(todo)
+
 	resp, err := HttpPost(url, header, nil, bodyParams)
 	if err != nil {
 		log.Fatal(err)
@@ -55,19 +48,18 @@ func TestHttpPost(t *testing.T) {
 }

 func TestHttpPut(t *testing.T) {
-	url := "http://public-api-v1.aspirantzhang.com/users/10420"
-	type User struct {
-		Name  string `json:"name"`
-		Email string `json:"email"`
-	}
-	user := User{
-		"test",
-		"test@test.com",
-	}
-	bodyParams, _ := json.Marshal(user)
+	url := "https://jsonplaceholder.typicode.com/todos/1"
 	header := map[string]string{
 		"Content-Type": "application/json",
 	}
+	type Todo struct {
+		Id     int    `json:"id"`
+		UserId int    `json:"userId"`
+		Title  string `json:"title"`
+	}
+	todo := Todo{1, 1, "TestPutToDo"}
+	bodyParams, _ := json.Marshal(todo)
+
 	resp, err := HttpPut(url, header, nil, bodyParams)
 	if err != nil {
 		log.Fatal(err)
@@ -77,8 +69,30 @@ func TestHttpPut(t *testing.T) {
 	fmt.Println("response: ", resp.StatusCode, string(body))
 }

+func TestHttpPatch(t *testing.T) {
+	url := "https://jsonplaceholder.typicode.com/todos/1"
+	header := map[string]string{
+		"Content-Type": "application/json",
+	}
+	type Todo struct {
+		Id     int    `json:"id"`
+		UserId int    `json:"userId"`
+		Title  string `json:"title"`
+	}
+	todo := Todo{1, 1, "TestPatchToDo"}
+	bodyParams, _ := json.Marshal(todo)
+
+	resp, err := HttpPatch(url, header, nil, bodyParams)
+	if err != nil {
+		log.Fatal(err)
+		t.FailNow()
+	}
+	body, _ := ioutil.ReadAll(resp.Body)
+	fmt.Println("response: ", resp.StatusCode, string(body))
+}
+
 func TestHttpDelete(t *testing.T) {
-	url := "http://public-api-v1.aspirantzhang.com/users/10420"
+	url := "https://jsonplaceholder.typicode.com/todos/1"
 	resp, err := HttpDelete(url)
 	if err != nil {
 		log.Fatal(err)
@@ -98,31 +112,35 @@ func TestConvertMapToQueryString(t *testing.T) {
 	expected := "a=1&b=2&c=3"
 	r := ConvertMapToQueryString(m)
 	if r != expected {
-		utils.LogFailedTestInfo(t, "ConvertMapToQueryString", m, expected, r)
+		internal.LogFailedTestInfo(t, "ConvertMapToQueryString", m, expected, r)
 		t.FailNow()
 	}
 }

 func TestParseResponse(t *testing.T) {
-	url := "http://public-api-v1.aspirantzhang.com/users"
-	type User struct {
-		Id    int    `json:"id"`
-		Name  string `json:"name"`
-		Email string `json:"email"`
+	url := "https://jsonplaceholder.typicode.com/todos/1"
+	header := map[string]string{
+		"Content-Type": "application/json",
 	}
-	type UserResp struct {
-		Data []User `json:"data"`
-	}
-	resp, err := HttpGet(url)
+
+	resp, err := HttpGet(url, header)
 	if err != nil {
 		log.Fatal(err)
 		t.FailNow()
 	}
-	userResp := &UserResp{}
-	err = ParseHttpResponse(resp, userResp)
+
+	type Todo struct {
+		Id        int    `json:"id"`
+		UserId    int    `json:"userId"`
+		Title     string `json:"title"`
+		Completed bool   `json:"completed"`
+	}
+
+	toDoResp := &Todo{}
+	err = ParseHttpResponse(resp, toDoResp)
 	if err != nil {
 		log.Fatal(err)
 		t.FailNow()
 	}
-	fmt.Println(userResp.Data)
+	fmt.Println("response: ", toDoResp)
 }
--- a/netutil/request_util.go
+++ b/netutil/request_util.go
@@ -10,7 +10,7 @@ import (
 	"strings"
 )

-func request(method, reqUrl string, params ...interface{}) (*http.Response, error) {
+func doHttpRequest(method, reqUrl string, params ...interface{}) (*http.Response, error) {
 	if len(reqUrl) == 0 {
 		return nil, errors.New("url should be specified")
 	}
@@ -24,53 +24,29 @@ func request(method, reqUrl string, params ...interface{}) (*http.Response, erro
 	}

 	client := &http.Client{}
+	err := setUrl(req, reqUrl)
+	if err != nil {
+		return nil, err
+	}
+
 	switch len(params) {
-	case 0:
-		err := setUrl(req, reqUrl)
-		if err != nil {
-			return nil, err
-		}
 	case 1:
-		err := setUrl(req, reqUrl)
-		if err != nil {
-			return nil, err
-		}
 		err = setHeader(req, params[0])
 		if err != nil {
 			return nil, err
 		}
 	case 2:
-		err := setHeader(req, params[0])
-		if err != nil {
-			return nil, err
-		}
-		err = setQueryParam(req, reqUrl, params[1])
+		err := setHeaderAndQueryParam(req, reqUrl, params[0], params[1])
 		if err != nil {
 			return nil, err
 		}
 	case 3:
-		err := setHeader(req, params[0])
-		if err != nil {
-			return nil, err
-		}
-		err = setQueryParam(req, reqUrl, params[1])
-		if err != nil {
-			return nil, err
-		}
-		err = setBodyByte(req, params[2])
+		err := setHeaderAndQueryAndBody(req, reqUrl, params[0], params[1], params[2])
 		if err != nil {
 			return nil, err
 		}
 	case 4:
-		err := setHeader(req, params[0])
-		if err != nil {
-			return nil, err
-		}
-		err = setQueryParam(req, reqUrl, params[1])
-		if err != nil {
-			return nil, err
-		}
-		err = setBodyByte(req, params[2])
+		err := setHeaderAndQueryAndBody(req, reqUrl, params[0], params[1], params[2])
 		if err != nil {
 			return nil, err
 		}
@@ -78,13 +54,40 @@ func request(method, reqUrl string, params ...interface{}) (*http.Response, erro
 		if err != nil {
 			return nil, err
 		}
-
 	}

 	resp, e := client.Do(req)
 	return resp, e
 }

+func setHeaderAndQueryParam(req *http.Request, reqUrl string, header, queryParam interface{}) error {
+	err := setHeader(req, header)
+	if err != nil {
+		return err
+	}
+	err = setQueryParam(req, reqUrl, queryParam)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func setHeaderAndQueryAndBody(req *http.Request, reqUrl string, header, queryParam, body interface{}) error {
+	err := setHeader(req, header)
+	if err != nil {
+		return err
+	}
+	err = setQueryParam(req, reqUrl, queryParam)
+	if err != nil {
+		return err
+	}
+	err = setBodyByte(req, body)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
 func setHeader(req *http.Request, header interface{}) error {
 	if header != nil {
 		switch v := header.(type) {
@@ -109,6 +112,7 @@ func setHeader(req *http.Request, header interface{}) error {

 	return nil
 }
+
 func setUrl(req *http.Request, reqUrl string) error {
 	u, err := url.Parse(reqUrl)
 	if err != nil {
@@ -117,6 +121,7 @@ func setUrl(req *http.Request, reqUrl string) error {
 	req.URL = u
 	return nil
 }
+
 func setQueryParam(req *http.Request, reqUrl string, queryParam interface{}) error {
 	var values url.Values
 	if queryParam != nil {
--- a/random/random_test.go
+++ b/random/random_test.go
@@ -14,7 +14,7 @@ import (
 	"regexp"
 	"testing"

-	"github.com/duke-git/lancet/utils"
+	"github.com/duke-git/lancet/internal"
 )

 func TestRandString(t *testing.T) {
@@ -24,7 +24,7 @@ func TestRandString(t *testing.T) {
 	reg := regexp.MustCompile(pattern)

 	if len(randStr) != 6 || !reg.MatchString(randStr) {
-		utils.LogFailedTestInfo(t, "RandString", "RandString(6)", "RandString(6) should be 6 letters ", randStr)
+		internal.LogFailedTestInfo(t, "RandString", "RandString(6)", "RandString(6) should be 6 letters ", randStr)
 		t.FailNow()
 	}
 }
@@ -32,19 +32,19 @@ func TestRandString(t *testing.T) {
 func TestRandInt(t *testing.T) {
 	res1 := RandInt(1, 10)
 	if res1 < 1 || res1 >= 10 {
-		utils.LogFailedTestInfo(t, "RandInt", "RandInt(1, 10)", "RandInt(1, 10) should between [1, 10) ", res1)
+		internal.LogFailedTestInfo(t, "RandInt", "RandInt(1, 10)", "RandInt(1, 10) should between [1, 10) ", res1)
 		t.FailNow()
 	}

 	res2 := RandInt(1, 1)
 	if res2 != 1 {
-		utils.LogFailedTestInfo(t, "RandInt", "RandInt(1, 1)", "RandInt(1, 1) should be 1 ", res2)
+		internal.LogFailedTestInfo(t, "RandInt", "RandInt(1, 1)", "RandInt(1, 1) should be 1 ", res2)
 		t.FailNow()
 	}

 	res3 := RandInt(10, 1)
 	if res3 < 1 || res3 >= 10 {
-		utils.LogFailedTestInfo(t, "RandInt", "RandInt(10, 1)", "RandInt(10, 1) should between [1, 10) ", res3)
+		internal.LogFailedTestInfo(t, "RandInt", "RandInt(10, 1)", "RandInt(10, 1) should between [1, 10) ", res3)
 		t.FailNow()
 	}
 }
@@ -52,19 +52,19 @@ func TestRandInt(t *testing.T) {
 func TestRandBytes(t *testing.T) {
 	randBytes := RandBytes(4)
 	if len(randBytes) != 4 {
-		utils.LogFailedTestInfo(t, "RandBytes", "RandBytes(4)", "RandBytes(4) should return 4 element of []bytes", randBytes)
+		internal.LogFailedTestInfo(t, "RandBytes", "RandBytes(4)", "RandBytes(4) should return 4 element of []bytes", randBytes)
 		t.FailNow()
 	}
 	v := reflect.ValueOf(randBytes)
 	et := v.Type().Elem()
 	if v.Kind() != reflect.Slice || et.Kind() != reflect.Uint8 {
-		utils.LogFailedTestInfo(t, "RandBytes", "RandBytes(4)", "RandBytes(4) should return 4 element of []bytes", randBytes)
+		internal.LogFailedTestInfo(t, "RandBytes", "RandBytes(4)", "RandBytes(4) should return 4 element of []bytes", randBytes)
 		t.FailNow()
 	}

 	randErr := RandBytes(0)
 	if randErr != nil {
-		utils.LogFailedTestInfo(t, "RandBytes", "RandBytes(0)", "RandBytes(0) should return nil", randErr)
+		internal.LogFailedTestInfo(t, "RandBytes", "RandBytes(0)", "RandBytes(0) should return nil", randErr)
 		t.FailNow()
 	}

--- a/slice/slice.go
+++ b/slice/slice.go
@@ -7,16 +7,20 @@ package slice
 import (
 	"errors"
 	"fmt"
+	"math"
+	"math/rand"
 	"reflect"
 	"sort"
 	"strings"
 	"unsafe"
 )

-// Contain check if the value is in the slice or not
-func Contain(slice interface{}, value interface{}) bool {
-	v := reflect.ValueOf(slice)
-	switch reflect.TypeOf(slice).Kind() {
+// Contain check if the value is in the iterable type or not
+func Contain(iterableType interface{}, value interface{}) bool {
+
+	v := reflect.ValueOf(iterableType)
+
+	switch kind := reflect.TypeOf(iterableType).Kind(); kind {
 	case reflect.Slice, reflect.Array:
 		for i := 0; i < v.Len(); i++ {
 			if v.Index(i).Interface() == value {
@@ -29,9 +33,15 @@ func Contain(slice interface{}, value interface{}) bool {
 			return true
 		}
 	case reflect.String:
-		s := fmt.Sprintf("%v", slice)
-		ss := fmt.Sprintf("%v", value)
+		s := iterableType.(string)
+		ss, ok := value.(string)
+		if !ok {
+			panic("kind mismatch")
+		}
+
 		return strings.Contains(s, ss)
+	default:
+		panic(fmt.Sprintf("kind %s is not support", iterableType))
 	}

 	return false
@@ -97,18 +107,18 @@ func Every(slice, function interface{}) bool {

 	elemType := sv.Type().Elem()
 	if checkSliceCallbackFuncSignature(fn, elemType, reflect.ValueOf(true).Type()) {
-		panic("Filter function must be of type func(int, " + elemType.String() + ")" + reflect.ValueOf(true).Type().String())
+		panic("function param should be of type func(int, " + elemType.String() + ")" + reflect.ValueOf(true).Type().String())
 	}

-	var indexes []int
+	var currentLength int
 	for i := 0; i < sv.Len(); i++ {
 		flag := fn.Call([]reflect.Value{reflect.ValueOf(i), sv.Index(i)})[0]
 		if flag.Bool() {
-			indexes = append(indexes, i)
+			currentLength++
 		}
 	}

-	return len(indexes) == sv.Len()
+	return currentLength == sv.Len()
 }

 // Some return true if any of the values in the list pass the predicate function.
@@ -119,7 +129,7 @@ func Some(slice, function interface{}) bool {

 	elemType := sv.Type().Elem()
 	if checkSliceCallbackFuncSignature(fn, elemType, reflect.ValueOf(true).Type()) {
-		panic("Filter function must be of type func(int, " + elemType.String() + ")" + reflect.ValueOf(true).Type().String())
+		panic("function param should be of type func(int, " + elemType.String() + ")" + reflect.ValueOf(true).Type().String())
 	}

 	has := false
@@ -141,7 +151,7 @@ func Filter(slice, function interface{}) interface{} {

 	elemType := sv.Type().Elem()
 	if checkSliceCallbackFuncSignature(fn, elemType, reflect.ValueOf(true).Type()) {
-		panic("Filter function must be of type func(int, " + elemType.String() + ")" + reflect.ValueOf(true).Type().String())
+		panic("function param should be of type func(int, " + elemType.String() + ")" + reflect.ValueOf(true).Type().String())
 	}

 	var indexes []int
@@ -159,18 +169,44 @@ func Filter(slice, function interface{}) interface{} {
 	return res.Interface()
 }

-// Find iterates over elements of slice, returning the first one that passes a truth test on function.
+// GroupBy iterate over elements of the slice, each element will be group by criteria, returns two slices
 // The function signature should be func(index int, value interface{}) bool .
-func Find(slice, function interface{}) interface{} {
+func GroupBy(slice, function interface{}) (interface{}, interface{}) {
 	sv := sliceValue(slice)
 	fn := functionValue(function)

 	elemType := sv.Type().Elem()
 	if checkSliceCallbackFuncSignature(fn, elemType, reflect.ValueOf(true).Type()) {
-		panic("Filter function must be of type func(int, " + elemType.String() + ")" + reflect.ValueOf(true).Type().String())
+		panic("function param should be of type func(int, " + elemType.String() + ")" + reflect.ValueOf(true).Type().String())
 	}

-	var index int
+	groupB := reflect.MakeSlice(sv.Type(), 0, 0)
+	groupA := reflect.MakeSlice(sv.Type(), 0, 0)
+
+	for i := 0; i < sv.Len(); i++ {
+		flag := fn.Call([]reflect.Value{reflect.ValueOf(i), sv.Index(i)})[0]
+		if flag.Bool() {
+			groupA = reflect.Append(groupA, sv.Index(i))
+		} else {
+			groupB = reflect.Append(groupB, sv.Index(i))
+		}
+	}
+
+	return groupA.Interface(), groupB.Interface()
+}
+
+// Find iterates over elements of slice, returning the first one that passes a truth test on function.
+// The function signature should be func(index int, value interface{}) bool .
+func Find(slice, function interface{}) (interface{}, bool) {
+	sv := sliceValue(slice)
+	fn := functionValue(function)
+
+	elemType := sv.Type().Elem()
+	if checkSliceCallbackFuncSignature(fn, elemType, reflect.ValueOf(true).Type()) {
+		panic("function param should be of type func(int, " + elemType.String() + ")" + reflect.ValueOf(true).Type().String())
+	}
+
+	index := -1
 	for i := 0; i < sv.Len(); i++ {
 		flag := fn.Call([]reflect.Value{reflect.ValueOf(i), sv.Index(i)})[0]
 		if flag.Bool() {
@@ -178,7 +214,37 @@ func Find(slice, function interface{}) interface{} {
 			break
 		}
 	}
-	return sv.Index(index).Interface()
+
+	if index == -1 {
+		var none interface{}
+		return none, false
+	}
+
+	return sv.Index(index).Interface(), true
+}
+
+// FlattenDeep flattens slice recursive
+func FlattenDeep(slice interface{}) interface{} {
+	sv := sliceValue(slice)
+	st := sliceElemType(sv.Type())
+	tmp := reflect.MakeSlice(reflect.SliceOf(st), 0, 0)
+	res := flattenRecursive(sv, tmp)
+	return res.Interface()
+}
+
+func flattenRecursive(value reflect.Value, result reflect.Value) reflect.Value {
+	for i := 0; i < value.Len(); i++ {
+		item := value.Index(i)
+		kind := item.Kind()
+
+		if kind == reflect.Slice {
+			result = flattenRecursive(item, result)
+		} else {
+			result = reflect.Append(result, item)
+		}
+	}
+
+	return result
 }

 // Map creates an slice of values by running each element of `slice` thru `function`.
@@ -189,7 +255,7 @@ func Map(slice, function interface{}) interface{} {

 	elemType := sv.Type().Elem()
 	if checkSliceCallbackFuncSignature(fn, elemType, nil) {
-		panic("Map function must be of type func(int, " + elemType.String() + ")" + elemType.String())
+		panic("function param should be of type func(int, " + elemType.String() + ")" + elemType.String())
 	}

 	res := reflect.MakeSlice(sv.Type(), sv.Len(), sv.Len())
@@ -215,7 +281,7 @@ func Reduce(slice, function, zero interface{}) interface{} {
 	fn := functionValue(function)
 	if checkSliceCallbackFuncSignature(fn, elementType, elementType, elementType) {
 		t := elementType.String()
-		panic("Reduce function must be of type func(int, " + t + ", " + t + ")" + t)
+		panic("function param should be of type func(int, " + t + ", " + t + ")" + t)
 	}

 	var params [3]reflect.Value
@@ -252,32 +318,34 @@ func InterfaceSlice(slice interface{}) []interface{} {

 // StringSlice convert param to slice of string.
 func StringSlice(slice interface{}) []string {
-	var res []string
-
 	v := sliceValue(slice)
+
+	out := make([]string, v.Len())
 	for i := 0; i < v.Len(); i++ {
-		res = append(res, fmt.Sprint(v.Index(i)))
+		v, ok := v.Index(i).Interface().(string)
+		if !ok {
+			panic("invalid element type")
+		}
+		out[i] = v
 	}

-	return res
+	return out
 }

 // IntSlice convert param to slice of int.
-func IntSlice(slice interface{}) ([]int, error) {
-	var res []int
-
+func IntSlice(slice interface{}) []int {
 	sv := sliceValue(slice)
+
+	out := make([]int, sv.Len())
 	for i := 0; i < sv.Len(); i++ {
-		v := sv.Index(i).Interface()
-		switch v := v.(type) {
-		case int:
-			res = append(res, v)
-		default:
-			return nil, errors.New("InvalidSliceElementType")
+		v, ok := sv.Index(i).Interface().(int)
+		if !ok {
+			panic("invalid element type")
 		}
+		out[i] = v
 	}

-	return res, nil
+	return out
 }

 // ConvertSlice convert original slice to new data type element of slice.
@@ -322,6 +390,37 @@ func DeleteByIndex(slice interface{}, start int, end ...int) (interface{}, error
 	return v.Interface(), nil
 }

+// Drop creates a slice with `n` elements dropped from the beginning when n > 0, or `n` elements dropped from the ending when n < 0
+func Drop(slice interface{}, n int) interface{} {
+	sv := sliceValue(slice)
+
+	if n == 0 {
+		return slice
+	}
+
+	svLen := sv.Len()
+
+	if math.Abs(float64(n)) >= float64(svLen) {
+		return reflect.MakeSlice(sv.Type(), 0, 0).Interface()
+	}
+
+	if n > 0 {
+		res := reflect.MakeSlice(sv.Type(), svLen-n, svLen-n)
+		for i := 0; i < res.Len(); i++ {
+			res.Index(i).Set(sv.Index(i + n))
+		}
+
+		return res.Interface()
+	}
+
+	res := reflect.MakeSlice(sv.Type(), svLen+n, svLen+n)
+	for i := 0; i < res.Len(); i++ {
+		res.Index(i).Set(sv.Index(i))
+	}
+
+	return res.Interface()
+}
+
 // InsertByIndex insert the element into slice at index.
 // Insert value: s = append(s[:i], append([]T{x}, s[i:]...)...)
 // Insert slice: a = append(a[:i], append(b, a[i:]...)...)
@@ -363,6 +462,7 @@ func UpdateByIndex(slice interface{}, index int, value interface{}) (interface{}
 	if index < 0 || index >= v.Len() {
 		return slice, errors.New("InvalidSliceIndex")
 	}
+
 	if reflect.TypeOf(slice).Elem() != reflect.TypeOf(value) {
 		return slice, errors.New("InvalidValueType")
 	}
@@ -379,22 +479,27 @@ func Unique(slice interface{}) interface{} {
 		return slice
 	}

-	var res []interface{}
+	var temp []interface{}
+
 	for i := 0; i < sv.Len(); i++ {
 		v := sv.Index(i).Interface()
-		flag := true
-		for j := range res {
-			if v == res[j] {
-				flag = false
+		skip := true
+		for j := range temp {
+			if v == temp[j] {
+				skip = false
 				break
 			}
 		}
-		if flag {
-			res = append(res, v)
+		if skip {
+			temp = append(temp, v)
 		}
 	}

-	return res
+	res := reflect.MakeSlice(sv.Type(), len(temp), len(temp))
+	for i := 0; i < len(temp); i++ {
+		res.Index(i).Set(reflect.ValueOf(temp[i]))
+	}
+	return res.Interface()

 	// if use map filter, the result slice element order is random, not same as origin slice
 	//mp := make(map[interface{}]bool)
@@ -411,21 +516,94 @@ func Unique(slice interface{}) interface{} {

 }

+// Union creates a slice of unique values, in order, from all given slices. using == for equality comparisons.
+func Union(slices ...interface{}) interface{} {
+	if len(slices) == 0 {
+		return nil
+	}
+	// append all slices, then unique it
+	var allSlices []interface{}
+	len := 0
+	for i := range slices {
+		sv := sliceValue(slices[i])
+		len += sv.Len()
+		for j := 0; j < sv.Len(); j++ {
+			v := sv.Index(j).Interface()
+			allSlices = append(allSlices, v)
+		}
+	}
+
+	sv := sliceValue(slices[0])
+	res := reflect.MakeSlice(sv.Type(), len, len)
+	for i := 0; i < len; i++ {
+		res.Index(i).Set(reflect.ValueOf(allSlices[i]))
+	}
+
+	return Unique(res.Interface())
+}
+
+// Intersection creates a slice of unique values that included by all slices.
+func Intersection(slices ...interface{}) interface{} {
+	if len(slices) == 0 {
+		return nil
+	}
+
+	reduceFunc := func(index int, slice1, slice2 interface{}) interface{} {
+		set := make([]interface{}, 0)
+		hash := make(map[interface{}]bool)
+
+		sv1 := reflect.ValueOf(slice1)
+		for i := 0; i < sv1.Len(); i++ {
+			v := sv1.Index(i).Interface()
+			hash[v] = true
+		}
+
+		sv2 := reflect.ValueOf(slice2)
+		for i := 0; i < sv2.Len(); i++ {
+			el := sv2.Index(i).Interface()
+			if _, found := hash[el]; found {
+				set = append(set, el)
+			}
+		}
+		res := reflect.MakeSlice(sv1.Type(), len(set), len(set))
+		for i := 0; i < len(set); i++ {
+			res.Index(i).Set(reflect.ValueOf(set[i]))
+		}
+		return res.Interface()
+	}
+
+	res := Reduce(slices, reduceFunc, nil)
+	return Unique(res)
+}
+
 // ReverseSlice return slice of element order is reversed to the given slice
 func ReverseSlice(slice interface{}) {
-	v := sliceValue(slice)
-	swp := reflect.Swapper(v.Interface())
-	for i, j := 0, v.Len()-1; i < j; i, j = i+1, j-1 {
+	sv := sliceValue(slice)
+	swp := reflect.Swapper(sv.Interface())
+	for i, j := 0, sv.Len()-1; i < j; i, j = i+1, j-1 {
 		swp(i, j)
 	}
 }

+// Shuffle creates an slice of shuffled values
+func Shuffle(slice interface{}) interface{} {
+	sv := sliceValue(slice)
+	length := sv.Len()
+
+	res := reflect.MakeSlice(sv.Type(), length, length)
+	for i, v := range rand.Perm(length) {
+		res.Index(i).Set(sv.Index(v))
+	}
+
+	return res.Interface()
+}
+
 // SortByField return sorted slice by field
 // Slice element should be struct, field type should be int, uint, string, or bool
 // default sortType is ascending (asc), if descending order, set sortType to desc
 func SortByField(slice interface{}, field string, sortType ...string) error {
-	v := sliceValue(slice)
-	t := v.Type().Elem()
+	sv := sliceValue(slice)
+	t := sv.Type().Elem()

 	if t.Kind() == reflect.Ptr {
 		t = t.Elem()
@@ -458,8 +636,8 @@ func SortByField(slice interface{}, field string, sortType ...string) error {
 	}

 	sort.Slice(slice, func(i, j int) bool {
-		a := v.Index(i)
-		b := v.Index(j)
+		a := sv.Index(i)
+		b := sv.Index(j)
 		if t.Kind() == reflect.Ptr {
 			a = a.Elem()
 			b = b.Elem()
@@ -474,3 +652,26 @@ func SortByField(slice interface{}, field string, sortType ...string) error {
 	}
 	return nil
 }
+
+// Without creates a slice excluding all given values
+func Without(slice interface{}, values ...interface{}) interface{} {
+	sv := sliceValue(slice)
+	if sv.Len() == 0 {
+		return slice
+	}
+
+	var indexes []int
+	for i := 0; i < sv.Len(); i++ {
+		v := sv.Index(i).Interface()
+		if !Contain(values, v) {
+			indexes = append(indexes, i)
+		}
+	}
+
+	res := reflect.MakeSlice(sv.Type(), len(indexes), len(indexes))
+	for i := range indexes {
+		res.Index(i).Set(sv.Index(indexes[i]))
+	}
+
+	return res.Interface()
+}
--- a/slice/slice_test.go
+++ b/slice/slice_test.go
@@ -4,7 +4,7 @@ import (
 	"reflect"
 	"testing"

-	"github.com/duke-git/lancet/utils"
+	"github.com/duke-git/lancet/internal"
 )

 func TestContain(t *testing.T) {
@@ -28,7 +28,7 @@ func TestContain(t *testing.T) {
 func contain(t *testing.T, test interface{}, value interface{}, expected bool) {
 	res := Contain(test, value)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "Contain", test, expected, res)
+		internal.LogFailedTestInfo(t, "Contain", test, expected, res)
 		t.FailNow()
 	}
 }
@@ -78,7 +78,7 @@ func TestChunk(t *testing.T) {
 func chunk(t *testing.T, test []interface{}, num int, expected [][]interface{}) {
 	res := Chunk(test, num)
 	if !reflect.DeepEqual(res, expected) {
-		utils.LogFailedTestInfo(t, "Chunk", test, expected, res)
+		internal.LogFailedTestInfo(t, "Chunk", test, expected, res)
 		t.FailNow()
 	}
 }
@@ -103,7 +103,7 @@ func TestEvery(t *testing.T) {
 	}
 	res := Every(nums, isEven)
 	if res != false {
-		utils.LogFailedTestInfo(t, "Every", nums, false, res)
+		internal.LogFailedTestInfo(t, "Every", nums, false, res)
 		t.FailNow()
 	}
 }
@@ -115,7 +115,7 @@ func TestSome(t *testing.T) {
 	}
 	res := Some(nums, isEven)
 	if res != true {
-		utils.LogFailedTestInfo(t, "Some", nums, true, res)
+		internal.LogFailedTestInfo(t, "Some", nums, true, res)
 		t.FailNow()
 	}
 }
@@ -128,7 +128,7 @@ func TestFilter(t *testing.T) {
 	e1 := []int{2, 4}
 	r1 := Filter(nums, even)
 	if !reflect.DeepEqual(r1, e1) {
-		utils.LogFailedTestInfo(t, "Filter", nums, e1, r1)
+		internal.LogFailedTestInfo(t, "Filter", nums, e1, r1)
 		t.FailNow()
 	}

@@ -155,20 +155,70 @@ func TestFilter(t *testing.T) {

 	r2 := Filter(students, filterFunc)
 	if !reflect.DeepEqual(r2, e2) {
-		utils.LogFailedTestInfo(t, "Filter", students, e2, r2)
+		internal.LogFailedTestInfo(t, "Filter", students, e2, r2)
 		t.FailNow()
 	}

 }

+func TestGroupBy(t *testing.T) {
+	nums := []int{1, 2, 3, 4, 5, 6}
+	evenFunc := func(i, num int) bool {
+		return (num % 2) == 0
+	}
+	expectedEven := []int{2, 4, 6}
+	even, odd := GroupBy(nums, evenFunc)
+
+	t.Log("odd", odd)
+
+	t.Log("even", even)
+
+	if !reflect.DeepEqual(IntSlice(even), expectedEven) {
+		internal.LogFailedTestInfo(t, "GroupBy even", nums, expectedEven, even)
+		t.FailNow()
+	}
+
+	expectedOdd := []int{1, 3, 5}
+	if !reflect.DeepEqual(IntSlice(odd), expectedOdd) {
+		internal.LogFailedTestInfo(t, "GroupBy odd", nums, expectedOdd, odd)
+		t.FailNow()
+	}
+}
+
 func TestFind(t *testing.T) {
 	nums := []int{1, 2, 3, 4, 5}
 	even := func(i, num int) bool {
 		return num%2 == 0
 	}
-	res := Find(nums, even)
+	res, ok := Find(nums, even)
+	if !ok {
+		t.Fatal("found nothing")
+	}
+
 	if res != 2 {
-		utils.LogFailedTestInfo(t, "Find", nums, 2, res)
+		internal.LogFailedTestInfo(t, "Find", nums, 2, res)
+		t.FailNow()
+	}
+}
+
+func TestFindFoundNothing(t *testing.T) {
+	nums := []int{1, 1, 1, 1, 1, 1}
+	findFunc := func(i, num int) bool {
+		return num > 1
+	}
+	_, ok := Find(nums, findFunc)
+	if ok {
+		t.Fatal("found something")
+	}
+}
+
+func TestFlattenDeep(t *testing.T) {
+	input := [][][]string{{{"a", "b"}}, {{"c", "d"}}}
+	expected := []string{"a", "b", "c", "d"}
+
+	res := FlattenDeep(input)
+	if !reflect.DeepEqual(res, expected) {
+		internal.LogFailedTestInfo(t, "FlattenDeep", input, expected, res)
 		t.FailNow()
 	}
 }
@@ -181,7 +231,7 @@ func TestMap(t *testing.T) {
 	e1 := []int{2, 4, 6, 8}
 	r1 := Map(s1, multiplyTwo)
 	if !reflect.DeepEqual(r1, e1) {
-		utils.LogFailedTestInfo(t, "Map", s1, e1, r1)
+		internal.LogFailedTestInfo(t, "Map", s1, e1, r1)
 		t.FailNow()
 	}

@@ -206,7 +256,7 @@ func TestMap(t *testing.T) {
 	}
 	r2 := Map(students, mapFunc)
 	if !reflect.DeepEqual(r2, e2) {
-		utils.LogFailedTestInfo(t, "Filter", students, e2, r2)
+		internal.LogFailedTestInfo(t, "Filter", students, e2, r2)
 		t.FailNow()
 	}
 }
@@ -223,7 +273,7 @@ func TestReduce(t *testing.T) {
 	for i := 0; i < len(cases); i++ {
 		res := Reduce(cases[i], f, 0)
 		if res != expected[i] {
-			utils.LogFailedTestInfo(t, "Reduce", cases[i], expected[i], res)
+			internal.LogFailedTestInfo(t, "Reduce", cases[i], expected[i], res)
 			t.FailNow()
 		}
 	}
@@ -237,12 +287,10 @@ func TestIntSlice(t *testing.T) {
 }

 func intSlice(t *testing.T, test interface{}, expected []int) {
-	res, err := IntSlice(test)
-	if err != nil {
-		t.Error("IntSlice Error: " + err.Error())
-	}
+	res := IntSlice(test)
+
 	if !reflect.DeepEqual(res, expected) {
-		utils.LogFailedTestInfo(t, "IntSlice", test, expected, res)
+		internal.LogFailedTestInfo(t, "IntSlice", test, expected, res)
 		t.FailNow()
 	}
 }
@@ -257,7 +305,7 @@ func TestStringSlice(t *testing.T) {
 func stringSlice(t *testing.T, test interface{}, expected []string) {
 	res := StringSlice(test)
 	if !reflect.DeepEqual(res, expected) {
-		utils.LogFailedTestInfo(t, "StringSlice", test, expected, res)
+		internal.LogFailedTestInfo(t, "StringSlice", test, expected, res)
 		t.FailNow()
 	}
 }
@@ -271,7 +319,7 @@ func TestInterfaceSlice(t *testing.T) {
 func interfaceSlice(t *testing.T, test interface{}, expected []interface{}) {
 	res := InterfaceSlice(test)
 	if !reflect.DeepEqual(res, expected) {
-		utils.LogFailedTestInfo(t, "InterfaceSlice", test, expected, res)
+		internal.LogFailedTestInfo(t, "InterfaceSlice", test, expected, res)
 		t.FailNow()
 	}
 }
@@ -323,7 +371,30 @@ func deleteByIndex(t *testing.T, origin, test interface{}, start, end int, expec
 	}

 	if !reflect.DeepEqual(res, expected) {
-		utils.LogFailedTestInfo(t, "DeleteByIndex", origin, expected, res)
+		internal.LogFailedTestInfo(t, "DeleteByIndex", origin, expected, res)
+		t.FailNow()
+	}
+}
+
+func TestDrop(t *testing.T) {
+	drop(t, []int{}, 0, []int{})
+	drop(t, []int{}, 1, []int{})
+	drop(t, []int{}, -1, []int{})
+
+	drop(t, []int{1, 2, 3, 4, 5}, 0, []int{1, 2, 3, 4, 5})
+	drop(t, []int{1, 2, 3, 4, 5}, 1, []int{2, 3, 4, 5})
+	drop(t, []int{1, 2, 3, 4, 5}, 5, []int{})
+	drop(t, []int{1, 2, 3, 4, 5}, 6, []int{})
+
+	drop(t, []int{1, 2, 3, 4, 5}, -1, []int{1, 2, 3, 4})
+	drop(t, []int{1, 2, 3, 4, 5}, -5, []int{})
+	drop(t, []int{1, 2, 3, 4, 5}, -6, []int{})
+}
+
+func drop(t *testing.T, test interface{}, n int, expected interface{}) {
+	res := Drop(test, n)
+	if !reflect.DeepEqual(res, expected) {
+		internal.LogFailedTestInfo(t, "Drop", test, expected, res)
 		t.FailNow()
 	}
 }
@@ -360,7 +431,7 @@ func insertByIndex(t *testing.T, test interface{}, index int, value, expected in
 	}

 	if !reflect.DeepEqual(res, expected) {
-		utils.LogFailedTestInfo(t, "InsertByIndex", test, expected, res)
+		internal.LogFailedTestInfo(t, "InsertByIndex", test, expected, res)
 		t.FailNow()
 	}
 }
@@ -387,7 +458,7 @@ func updateByIndex(t *testing.T, test interface{}, index int, value, expected in
 	}

 	if !reflect.DeepEqual(res, expected) {
-		utils.LogFailedTestInfo(t, "UpdateByIndex", test, expected, res)
+		internal.LogFailedTestInfo(t, "UpdateByIndex", test, expected, res)
 		t.FailNow()
 	}
 }
@@ -395,27 +466,74 @@ func updateByIndex(t *testing.T, test interface{}, index int, value, expected in
 func TestUnique(t *testing.T) {
 	t1 := []int{1, 2, 2, 3}
 	e1 := []int{1, 2, 3}
-	r1, _ := IntSlice(Unique(t1))
+	r1 := Unique(t1)
 	if !reflect.DeepEqual(r1, e1) {
-		utils.LogFailedTestInfo(t, "Unique", t1, e1, r1)
+		internal.LogFailedTestInfo(t, "Unique", t1, e1, r1)
 		t.FailNow()
 	}

 	t2 := []string{"a", "a", "b", "c"}
 	e2 := []string{"a", "b", "c"}
-	r2 := StringSlice(Unique(t2))
+	r2 := Unique(t2)
 	if !reflect.DeepEqual(r2, e2) {
-		utils.LogFailedTestInfo(t, "Unique", t2, e2, r2)
+		internal.LogFailedTestInfo(t, "Unique", t2, e2, r2)
 		t.FailNow()
 	}
 }

+func TestUnion(t *testing.T) {
+	s1 := []int{1, 3, 4, 6}
+	s2 := []int{1, 2, 5, 6}
+	s3 := []int{0, 4, 5, 7}
+
+	expected1 := []int{1, 3, 4, 6, 2, 5, 0, 7}
+	res1 := Union(s1, s2, s3)
+	if !reflect.DeepEqual(res1, expected1) {
+		internal.LogFailedTestInfo(t, "Union", s1, expected1, res1)
+		t.FailNow()
+	}
+
+	expected2 := []int{1, 3, 4, 6}
+	res2 := Union(s1)
+	if !reflect.DeepEqual(res2, expected2) {
+		internal.LogFailedTestInfo(t, "Union", s1, expected2, res2)
+		t.FailNow()
+	}
+}
+
+func TestIntersection(t *testing.T) {
+	s1 := []int{1, 2, 2, 3}
+	s2 := []int{1, 2, 3, 4}
+	s3 := []int{0, 2, 3, 5, 6}
+	s4 := []int{0, 5, 6}
+
+	expected := [][]int{
+		{2, 3},
+		{1, 2, 3},
+		{1, 2, 3},
+		{},
+	}
+	res := []interface{}{
+		Intersection(s1, s2, s3),
+		Intersection(s1, s2),
+		Intersection(s1),
+		Intersection(s1, s4),
+	}
+	for i := 0; i < len(res); i++ {
+		if !reflect.DeepEqual(res[i], expected[i]) {
+			internal.LogFailedTestInfo(t, "Intersection", "Intersection", expected[i], res[i])
+			t.FailNow()
+		}
+	}
+
+}
+
 func TestReverseSlice(t *testing.T) {
 	s1 := []int{1, 2, 3, 4, 5}
 	e1 := []int{5, 4, 3, 2, 1}
 	ReverseSlice(s1)
 	if !reflect.DeepEqual(s1, e1) {
-		utils.LogFailedTestInfo(t, "ReverseSlice", s1, e1, s1)
+		internal.LogFailedTestInfo(t, "ReverseSlice", s1, e1, s1)
 		t.FailNow()
 	}

@@ -423,7 +541,7 @@ func TestReverseSlice(t *testing.T) {
 	e2 := []string{"e", "d", "c", "b", "a"}
 	ReverseSlice(s2)
 	if !reflect.DeepEqual(s2, e2) {
-		utils.LogFailedTestInfo(t, "ReverseSlice", s2, e2, s2)
+		internal.LogFailedTestInfo(t, "ReverseSlice", s2, e2, s2)
 		t.FailNow()
 	}
 }
@@ -434,7 +552,7 @@ func TestDifference(t *testing.T) {
 	e1 := []int{1, 2, 3}
 	r1 := Difference(s1, s2)
 	if !reflect.DeepEqual(r1, e1) {
-		utils.LogFailedTestInfo(t, "Difference", s1, e1, r1)
+		internal.LogFailedTestInfo(t, "Difference", s1, e1, r1)
 		t.FailNow()
 	}
 }
@@ -464,8 +582,30 @@ func TestSortByField(t *testing.T) {
 	}

 	if !reflect.DeepEqual(students, sortByAge) {
-		utils.LogFailedTestInfo(t, "SortByField", students, sortByAge, students)
+		internal.LogFailedTestInfo(t, "SortByField", students, sortByAge, students)
 		t.FailNow()
 	}

 }
+
+func TestWithout(t *testing.T) {
+	s := []int{1, 2, 3, 4, 5}
+	expected := []int{3, 4, 5}
+	res := Without(s, 1, 2)
+
+	if !reflect.DeepEqual(res, expected) {
+		internal.LogFailedTestInfo(t, "Without", s, expected, res)
+		t.FailNow()
+	}
+}
+
+func TestShuffle(t *testing.T) {
+	s := []int{1, 2, 3, 4, 5}
+	res := Shuffle(s)
+	t.Log("Shuffle result: ", res)
+
+	if reflect.TypeOf(s) != reflect.TypeOf(res) {
+		internal.LogFailedTestInfo(t, "Shuffle", s, res, res)
+		t.FailNow()
+	}
+}
--- a/slice/slice_util.go
+++ b/slice/slice_util.go
@@ -52,3 +52,14 @@ func checkSliceCallbackFuncSignature(fn reflect.Value, types ...reflect.Type) bo
 	}
 	return true
 }
+
+// sliceElemType get slice element type
+func sliceElemType(reflectType reflect.Type) reflect.Type {
+	for {
+		if reflectType.Kind() != reflect.Slice {
+			return reflectType
+		}
+
+		reflectType = reflectType.Elem()
+	}
+}
--- a/strutil/string.go
+++ b/strutil/string.go
@@ -7,6 +7,8 @@ package strutil
 import (
 	"regexp"
 	"strings"
+	"unicode"
+	"unicode/utf8"
 )

 // CamelCase covert string to camelCase string.
@@ -40,18 +42,16 @@ func Capitalize(s string) string {
 		return ""
 	}

-	res := ""
-	for i, v := range []rune(s) {
+	out := make([]rune, len(s))
+	for i, v := range s {
 		if i == 0 {
-			if v >= 97 && v <= 122 {
-				v -= 32
-			}
-			res += string(v)
+			out[i] = unicode.ToUpper(v)
 		} else {
-			res += strings.ToLower(string(v))
+			out[i] = unicode.ToLower(v)
 		}
 	}
-	return res
+
+	return string(out)
 }

 // LowerFirst converts the first character of string to lower case.
@@ -60,20 +60,10 @@ func LowerFirst(s string) string {
 		return ""
 	}

-	res := ""
-	for i, v := range []rune(s) {
-		if i == 0 {
-			if v >= 65 && v <= 96 {
-				v += 32
-				res += string(v)
-			} else {
-				return s
-			}
-		} else {
-			res += string(v)
-		}
-	}
-	return res
+	r, size := utf8.DecodeRuneInString(s)
+	r = unicode.ToLower(r)
+
+	return string(r) + s[size:]
 }

 // PadEnd pads string on the right side if it's shorter than size.
--- a/strutil/string_test.go
+++ b/strutil/string_test.go
@@ -3,7 +3,7 @@ package strutil
 import (
 	"testing"

-	"github.com/duke-git/lancet/utils"
+	"github.com/duke-git/lancet/internal"
 )

 func TestCamelCase(t *testing.T) {
@@ -16,7 +16,7 @@ func TestCamelCase(t *testing.T) {
 func camelCase(t *testing.T, test string, expected string) {
 	res := CamelCase(test)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "CamelCase", test, expected, res)
+		internal.LogFailedTestInfo(t, "CamelCase", test, expected, res)
 		t.FailNow()
 	}
 }
@@ -30,7 +30,7 @@ func TestCapitalize(t *testing.T) {
 func capitalize(t *testing.T, test string, expected string) {
 	res := Capitalize(test)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "Capitalize", test, expected, res)
+		internal.LogFailedTestInfo(t, "Capitalize", test, expected, res)
 		t.FailNow()
 	}
 }
@@ -45,7 +45,7 @@ func TestKebabCase(t *testing.T) {
 func kebabCase(t *testing.T, test string, expected string) {
 	res := KebabCase(test)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "KebabCase", test, expected, res)
+		internal.LogFailedTestInfo(t, "KebabCase", test, expected, res)
 		t.FailNow()
 	}
 }
@@ -61,7 +61,7 @@ func TestSnakeCase(t *testing.T) {
 func snakeCase(t *testing.T, test string, expected string) {
 	res := SnakeCase(test)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "SnakeCase", test, expected, res)
+		internal.LogFailedTestInfo(t, "SnakeCase", test, expected, res)
 		t.FailNow()
 	}
 }
@@ -70,12 +70,13 @@ func TestLowerFirst(t *testing.T) {
 	lowerFirst(t, "foo", "foo")
 	lowerFirst(t, "BAR", "bAR")
 	lowerFirst(t, "FOo", "fOo")
+	lowerFirst(t, "FOo大", "fOo大")
 }

 func lowerFirst(t *testing.T, test string, expected string) {
 	res := LowerFirst(test)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "LowerFirst", test, expected, res)
+		internal.LogFailedTestInfo(t, "LowerFirst", test, expected, res)
 		t.FailNow()
 	}
 }
@@ -91,7 +92,7 @@ func TestPadEnd(t *testing.T) {
 func padEnd(t *testing.T, source string, size int, fillString string, expected string) {
 	res := PadEnd(source, size, fillString)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "PadEnd", source, expected, res)
+		internal.LogFailedTestInfo(t, "PadEnd", source, expected, res)
 		t.FailNow()
 	}
 }
@@ -107,7 +108,7 @@ func TestPadStart(t *testing.T) {
 func padStart(t *testing.T, source string, size int, fillString string, expected string) {
 	res := PadStart(source, size, fillString)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "PadEnd", source, expected, res)
+		internal.LogFailedTestInfo(t, "PadEnd", source, expected, res)
 		t.FailNow()
 	}
 }
@@ -121,7 +122,7 @@ func TestBefore(t *testing.T) {
 func before(t *testing.T, source, char, expected string) {
 	res := Before(source, char)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "Before", source, expected, res)
+		internal.LogFailedTestInfo(t, "Before", source, expected, res)
 		t.FailNow()
 	}
 }
@@ -135,7 +136,7 @@ func TestBeforeLast(t *testing.T) {
 func beforeLast(t *testing.T, source, char, expected string) {
 	res := BeforeLast(source, char)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "BeforeLast", source, expected, res)
+		internal.LogFailedTestInfo(t, "BeforeLast", source, expected, res)
 		t.FailNow()
 	}
 }
@@ -149,7 +150,7 @@ func TestAfter(t *testing.T) {
 func after(t *testing.T, source, char, expected string) {
 	res := After(source, char)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "After", source, expected, res)
+		internal.LogFailedTestInfo(t, "After", source, expected, res)
 		t.FailNow()
 	}
 }
@@ -163,7 +164,7 @@ func TestAfterLast(t *testing.T) {
 func afterLast(t *testing.T, source, char, expected string) {
 	res := AfterLast(source, char)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "AfterLast", source, expected, res)
+		internal.LogFailedTestInfo(t, "AfterLast", source, expected, res)
 		t.FailNow()
 	}
 }
@@ -178,7 +179,7 @@ func TestIsString(t *testing.T) {
 func isString(t *testing.T, test interface{}, expected bool) {
 	res := IsString(test)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "IsString", test, expected, res)
+		internal.LogFailedTestInfo(t, "IsString", test, expected, res)
 		t.FailNow()
 	}
 }
@@ -194,7 +195,7 @@ func TestReverseStr(t *testing.T) {
 func reverseStr(t *testing.T, test string, expected string) {
 	res := ReverseStr(test)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "ReverseStr", test, expected, res)
+		internal.LogFailedTestInfo(t, "ReverseStr", test, expected, res)
 		t.FailNow()
 	}
 }
--- a/validator/validator_test.go
+++ b/validator/validator_test.go
@@ -3,7 +3,7 @@ package validator
 import (
 	"testing"

-	"github.com/duke-git/lancet/utils"
+	"github.com/duke-git/lancet/internal"
 )

 func TestIsNumberStr(t *testing.T) {
@@ -17,7 +17,7 @@ func TestIsNumberStr(t *testing.T) {
 func isNumberStr(t *testing.T, source string, expected bool) {
 	res := IsNumberStr(source)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "IsNumberStr", source, expected, res)
+		internal.LogFailedTestInfo(t, "IsNumberStr", source, expected, res)
 		t.FailNow()
 	}
 }
@@ -33,7 +33,7 @@ func TestIsFloatStr(t *testing.T) {
 func isFloatStr(t *testing.T, source string, expected bool) {
 	res := IsFloatStr(source)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "IsFloatStr", source, expected, res)
+		internal.LogFailedTestInfo(t, "IsFloatStr", source, expected, res)
 		t.FailNow()
 	}
 }
@@ -48,7 +48,7 @@ func TestIsIntStr(t *testing.T) {
 func isIntStr(t *testing.T, source string, expected bool) {
 	res := IsIntStr(source)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "IsIntStr", source, expected, res)
+		internal.LogFailedTestInfo(t, "IsIntStr", source, expected, res)
 		t.FailNow()
 	}
 }
@@ -63,7 +63,7 @@ func TestIsIp(t *testing.T) {
 func isIp(t *testing.T, source string, expected bool) {
 	res := IsIp(source)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "IsIp", source, expected, res)
+		internal.LogFailedTestInfo(t, "IsIp", source, expected, res)
 		t.FailNow()
 	}
 }
@@ -76,7 +76,7 @@ func TestIsIpV4(t *testing.T) {
 func isIpV4(t *testing.T, source string, expected bool) {
 	res := IsIpV4(source)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "IsIpV4", source, expected, res)
+		internal.LogFailedTestInfo(t, "IsIpV4", source, expected, res)
 		t.FailNow()
 	}
 }
@@ -89,7 +89,7 @@ func TestIsIpV6(t *testing.T) {
 func isIpV6(t *testing.T, source string, expected bool) {
 	res := IsIpV6(source)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "IsIpV6", source, expected, res)
+		internal.LogFailedTestInfo(t, "IsIpV6", source, expected, res)
 		t.FailNow()
 	}
 }
@@ -102,7 +102,7 @@ func TestIsDns(t *testing.T) {
 func isDns(t *testing.T, source string, expected bool) {
 	res := IsDns(source)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "IsDns", source, expected, res)
+		internal.LogFailedTestInfo(t, "IsDns", source, expected, res)
 		t.FailNow()
 	}
 }
@@ -115,7 +115,7 @@ func TestIsEmail(t *testing.T) {
 func isEmail(t *testing.T, source string, expected bool) {
 	res := IsEmail(source)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "IsEmail", source, expected, res)
+		internal.LogFailedTestInfo(t, "IsEmail", source, expected, res)
 		t.FailNow()
 	}
 }
@@ -129,7 +129,7 @@ func TestContainChinese(t *testing.T) {
 func containChinese(t *testing.T, source string, expected bool) {
 	res := ContainChinese(source)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "IsContainChineseChar", source, expected, res)
+		internal.LogFailedTestInfo(t, "IsContainChineseChar", source, expected, res)
 		t.FailNow()
 	}
 }
@@ -142,7 +142,7 @@ func TestIsChineseMobile(t *testing.T) {
 func isChineseMobile(t *testing.T, source string, expected bool) {
 	res := IsChineseMobile(source)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "IsChineseMobile", source, expected, res)
+		internal.LogFailedTestInfo(t, "IsChineseMobile", source, expected, res)
 		t.FailNow()
 	}
 }
@@ -156,7 +156,7 @@ func TestIsChinesePhone(t *testing.T) {
 func isChinesePhone(t *testing.T, source string, expected bool) {
 	res := IsChinesePhone(source)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "IsChinesePhone", source, expected, res)
+		internal.LogFailedTestInfo(t, "IsChinesePhone", source, expected, res)
 		t.FailNow()
 	}
 }
@@ -171,7 +171,7 @@ func TestIsChineseIdNum(t *testing.T) {
 func isChineseIdNum(t *testing.T, source string, expected bool) {
 	res := IsChineseIdNum(source)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "IsChineseIdNum", source, expected, res)
+		internal.LogFailedTestInfo(t, "IsChineseIdNum", source, expected, res)
 		t.FailNow()
 	}
 }
@@ -184,7 +184,7 @@ func TestIsCreditCard(t *testing.T) {
 func isCreditCard(t *testing.T, source string, expected bool) {
 	res := IsCreditCard(source)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "IsCreditCard", source, expected, res)
+		internal.LogFailedTestInfo(t, "IsCreditCard", source, expected, res)
 		t.FailNow()
 	}
 }
@@ -197,7 +197,7 @@ func TestIsBase64(t *testing.T) {
 func isBase64(t *testing.T, source string, expected bool) {
 	res := IsBase64(source)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "IsBase64", source, expected, res)
+		internal.LogFailedTestInfo(t, "IsBase64", source, expected, res)
 		t.FailNow()
 	}
 }
@@ -212,7 +212,7 @@ func TestIsEmptyString(t *testing.T) {
 func isEmptyString(t *testing.T, source string, expected bool) {
 	res := IsEmptyString(source)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "IsEmptyString", source, expected, res)
+		internal.LogFailedTestInfo(t, "IsEmptyString", source, expected, res)
 		t.FailNow()
 	}
 }
@@ -228,7 +228,7 @@ func TestIsAlpha(t *testing.T) {
 func isAlpha(t *testing.T, source string, expected bool) {
 	res := IsAlpha(source)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "IsAlpha", source, expected, res)
+		internal.LogFailedTestInfo(t, "IsAlpha", source, expected, res)
 		t.FailNow()
 	}
 }
@@ -243,7 +243,7 @@ func TestIsRegexMatch(t *testing.T) {
 func isRegexMatch(t *testing.T, source, regex string, expected bool) {
 	res := IsRegexMatch(source, regex)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "IsRegexMatch", source, expected, res)
+		internal.LogFailedTestInfo(t, "IsRegexMatch", source, expected, res)
 		t.FailNow()
 	}
 }
@@ -261,7 +261,7 @@ func TestIsStrongPassword(t *testing.T) {
 func isStrongPassword(t *testing.T, source string, length int, expected bool) {
 	res := IsStrongPassword(source, length)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "IsStrongPassword", source, expected, res)
+		internal.LogFailedTestInfo(t, "IsStrongPassword", source, expected, res)
 		t.FailNow()
 	}
 }
@@ -277,7 +277,7 @@ func TestIsWeakPassword(t *testing.T) {
 func isWeakPassword(t *testing.T, source string, expected bool) {
 	res := IsWeakPassword(source)
 	if res != expected {
-		utils.LogFailedTestInfo(t, "IsWeakPassword", source, expected, res)
+		internal.LogFailedTestInfo(t, "IsWeakPassword", source, expected, res)
 		t.FailNow()
 	}
 }
Author	SHA1	Message	Date
dudaodong	4fd8a18677	release v1.1.6	2022-01-03 15:58:19 +08:00
dudaodong	3de906d7c9	refactor: reduce gocyclo of doHttpRequest func	2022-01-03 15:53:25 +08:00
dudaodong	56fc12c660	refactor: reduce gocyclo of ToString func	2022-01-03 15:15:22 +08:00
dudaodong	7a9b0847f9	fix: fix some go line issue in go report card	2022-01-03 14:57:14 +08:00
dudaodong	9266d99249	add chinese comment for GroupBy func	2022-01-02 22:12:01 +08:00
donutloop	f15131f032	Slice: find nothing case (#11 ) The current behavior can result into wired edge cases. Current behavior if find was unsuccessfully then it will return the first element of the slice Desired behavior if find was unsuccessfully then it should return negative ok and a none value	2022-01-02 22:05:27 +08:00
donutloop	b4a49fccfd	Slice: Add GroupBy func (#10 ) Group by: split slice into two groups, applies on each slice element a predicate func to categorize this element. Changes * Add groub by func * Add test case for this func	2022-01-02 21:24:56 +08:00
dudaodong	94b1a1d383	feat: add Reset func for watcher	2022-01-01 20:14:41 +08:00
dudaodong	7db46696f6	release v1.1.5	2022-01-01 20:13:21 +08:00
dudaodong	d4f49af2ad	feat: add watcher for record code excution time	2022-01-01 19:56:15 +08:00
dudaodong	ed4acc1c67	feat: add Shuffle func	2022-01-01 19:18:33 +08:00
dudaodong	042a00296f	feat: add FlattenDeep func	2022-01-01 18:14:35 +08:00
dudaodong	b42aac53b3	feat: add Drop func	2022-01-01 17:20:41 +08:00
dudaodong	c625a88067	refactor: rename package 'utils' to 'internal'	2021-12-31 11:36:11 +08:00
dudaodong	e15ae9eb98	update: add Md5String func and Md5File func	2021-12-31 11:25:43 +08:00
dudaodong	bb4ac01209	Merge branch 'main' of github.com:duke-git/lancet into main	2021-12-31 10:18:11 +08:00
donutloop	147c1625b5	Slice: Optimize slice func tools (#9 ) IntSlice and StringSlice: preallocate memory up front for output slice. Instead returning a error throw a panic because most likely it's a programming error. Contain: rename slice to iterableType and add default case for type mismatches	2021-12-31 10:15:38 +08:00
dudaodong	2aed55f704	refactor: function in slice.go	2021-12-31 10:12:14 +08:00
dudaodong	051f20caef	release: v1.1.4, merge pr7 and pr8	2021-12-30 20:25:20 +08:00
donutloop	613785b07c	function: catch earlier programming error (#8 ) Place at first line of the function body a function type safe guard check.	2021-12-30 20:22:00 +08:00
donutloop	0b0eb695e8	datetime: optimized func calls (#7 ) Replace time parsing calls with less expensive operations	2021-12-30 10:29:10 +08:00
dudaodong	745082fff1	fix: update api url for http timeout issue in the task of github actions	2021-12-29 11:39:48 +08:00
dudaodong	24b8da360e	release: v1.1.3, merge pr5 and pr6	2021-12-29 09:55:42 +08:00
donutloop	b106c428ae	Every: use int counter (#6 ) Use counter to verify all elements passed the perdicate func. Replace slice of indexes with int counter.	2021-12-29 09:51:50 +08:00
dudaodong	8b1171d0cb	fmt: go fmt for request_test.go	2021-12-28 19:28:55 +08:00
donutloop	ab012f2545	LowerFirst: use slicing and utf8 func tools (#5 ) Replace looping with slicing and utf8 func tools operations.	2021-12-28 19:25:44 +08:00
dudaodong	a952cb208a	release v1.1.2	2021-12-28 11:28:00 +08:00
dudaodong	f239a8ca8e	fix: fix request timeout issue	2021-12-28 11:04:57 +08:00
dudaodong	5c6626b37e	fmt: go fmt for function.go	2021-12-28 11:00:43 +08:00
dudaodong	16b5101600	fix: fix TestHttpPost timeout issue	2021-12-28 10:56:54 +08:00
dudaodong	ec983b7aa6	fix: fix Intersection slice issue	2021-12-28 10:16:53 +08:00
dudaodong	56fc2aabd6	fmt: fix lint issue	2021-12-28 10:08:08 +08:00
dudaodong	0ddd52225b	Merge branch 'main' of github.com:duke-git/lancet into main	2021-12-28 10:07:33 +08:00
donutloop	3919160e38	Optimized: Capitalize (#4 ) * Use unicode.ToUpper func to convert first letter in string to upper case letter. * Preallocate memory with correct length and cap because the final string is not changing.	2021-12-28 10:04:15 +08:00
dudaodong	40ec5bc0f6	fmt: fix lint issue	2021-12-27 20:40:54 +08:00
dudaodong	99faeccb05	feat: add Intersection, Union, Without func for slice/slice.go	2021-12-27 19:54:04 +08:00
dudaodong	ad777bc877	feat: add Intersection, Union, Without func for slice/slice.go	2021-12-27 19:47:45 +08:00
dudaodong	589ce7404f	refactor: update painc message	2021-12-27 15:12:18 +08:00
dudaodong	6ab4fca433	fmt: go fmt fileutil/file_test.go and function/function.go	2021-12-26 21:41:46 +08:00