feat: merge some new functions from v2 branch

2026-02-04 12:52:28 +08:00 · 2024-09-04 10:13:36 +08:00
parent ab2e5a3137
commit c9a8c70ee6
7 changed files with 771 additions and 160 deletions
--- a/docs/random.md
+++ b/docs/random.md
@@ -30,7 +30,13 @@ import (
 -   [RandNumeral](#RandNumeral)
 -   [RandNumeralOrLetter](#RandNumeralOrLetter)
 -   [UUIdV4](#UUIdV4)
+-   [RandFloat](#RandFloat)
+-   [RandFloats](#RandFloats)
 -   [RandUniqueIntSlice](#RandUniqueIntSlice)
+-   [RandIntSlice](#RandIntSlice)
+-   [RandStringSlice](#RandStringSlice)
+-   [RandBool](#RandBool)
+-   [RandBoolSlice](#RandBoolSlice)

 <div STYLE="page-break-after: always;"></div>

@@ -247,6 +253,58 @@ func main() {
 }
 ```

+### <span id="RandFloat">RandFloat</span>
+
+<p>Generate a random float64 number between [min, max) with specific precision.</p>
+
+<b>Signature:</b>
+
+```go
+func RandFloat(min, max float64, precision int) float64
+```
+
+<b>Example:<span style="float:right;display:inline-block;">[Run](https://go.dev/play/p/zbD_tuobJtr)</span></b>
+
+```go
+package main
+
+import (
+    "fmt"
+    "github.com/duke-git/lancet/random"
+)
+
+func main() {
+    floatNumber := random.RandFloat(1.0, 5.0, 2)
+    fmt.Println(floatNumber) //2.14 (random number)
+}
+```
+
+### <span id="RandFloats">RandFloats</span>
+
+<p>Generate a slice of random float64 numbers of length n that do not repeat. Number range in [min, max)</p>
+
+<b>Signature:</b>
+
+```go
+func RandFloats(length int, min, max float64, precision int) []float64
+```
+
+<b>Example:<span style="float:right;display:inline-block;">[Run](https://go.dev/play/p/I3yndUQ-rhh)</span></b>
+
+```go
+package main
+
+import (
+    "fmt"
+    "github.com/duke-git/lancet/random"
+)
+
+func main() {
+    floatNumbers := random.RandFloats(5, 1.0, 5.0, 2)
+    fmt.Println(floatNumbers) //[3.42 3.99 1.3 2.38 4.23] (random)
+}
+```
+
 ### <span id="RandUniqueIntSlice">RandUniqueIntSlice</span>

 <p>Generate a slice of random int of length n that do not repeat.</p>
@@ -272,3 +330,110 @@ func main() {
    fmt.Println(result) //[0 4 7 1 5] (random)
 }
 ```
+
+### <span id="RandIntSlice">RandIntSlice</span>
+
+<p>Generate a slice of random int. Number range in [min, max)</p>
+
+<b>Signature:</b>
+
+```go
+func RandIntSlice(length, min, max int) []int
+```
+
+<b>Example:</b>
+
+```go
+package main
+
+import (
+    "fmt"
+    "github.com/duke-git/lancet/random"
+)
+
+func main() {
+    result := random.RandIntSlice(5, 0, 10)
+    fmt.Println(result) //[1 4 7 1 5] (random)
+}
+```
+
+### <span id="RandStringSlice">RandStringSlice</span>
+
+<p>Generate a slice of random string of length strLen based on charset. chartset should be one of the following: random.Numeral, random.LowwerLetters, random.UpperLetters random.Letters, random.SymbolChars, random.AllChars. or a combination of them.</p>
+
+<b>Signature:</b>
+
+```go
+func RandStringSlice(charset string, sliceLen, strLen int) []string
+```
+
+<b>Example:</b>
+
+```go
+package main
+
+import (
+    "fmt"
+    "github.com/duke-git/lancet/random"
+)
+
+func main() {
+    strs := random.RandStringSlice(random.Letters, 4, 6)
+    fmt.Println(strs)
+
+    // output random string slice like below:
+    //[CooSMq RUFjDz FAeMPf heRyGv]
+}
+```
+
+### <span id="RandBool">RandBool</span>
+
+<p>Generate a random boolean value (true or false).</p>
+
+<b>Signature:</b>
+
+```go
+func RandBool() bool
+```
+
+<b>Example:</b>
+
+```go
+package main
+
+import (
+    "fmt"
+    "github.com/duke-git/lancet/random"
+)
+
+func main() {
+    result := random.RandBool()
+    fmt.Println(result) // true or false (random)
+}
+```
+
+### <span id="RandBoolSlice">RandBoolSlice</span>
+
+<p>Generates a random boolean slice of specified length.</p>
+
+<b>Signature:</b>
+
+```go
+func RandBoolSlice(length int) []bool
+```
+
+<b>Example:</b>
+
+```go
+package main
+
+import (
+    "fmt"
+    "github.com/duke-git/lancet/random"
+)
+
+func main() {
+    result := random.RandBoolSlice(2)
+    fmt.Println(result) // [true false] (random)
+}
+```
--- a/docs/random_zh-CN.md
+++ b/docs/random_zh-CN.md
@@ -30,7 +30,13 @@ import (
 -   [RandNumeral](#RandNumeral)
 -   [RandNumeralOrLetter](#RandNumeralOrLetter)
 -   [UUIdV4](#UUIdV4)
+-   [RandFloat](#RandFloat)
+-   [RandFloats](#RandFloats)
 -   [RandUniqueIntSlice](#RandUniqueIntSlice)
+-   [RandIntSlice](#RandIntSlice)
+-   [RandStringSlice](#RandStringSlice)
+-   [RandBool](#RandBool)
+-   [RandBoolSlice](#RandBoolSlice)

 <div STYLE="page-break-after: always;"></div>

@@ -247,6 +253,58 @@ func main() {
 }
 ```

+### <span id="RandFloat">RandFloat</span>
+
+<p>Generate a random float64 number between [min, max) with specific precision.</p>
+
+<b>Signature:</b>
+
+```go
+func RandFloat(min, max float64, precision int) float64
+```
+
+<b>Example:<span style="float:right;display:inline-block;">[Run](https://go.dev/play/p/zbD_tuobJtr)</span></b>
+
+```go
+package main
+
+import (
+    "fmt"
+    "github.com/duke-git/lancet/random"
+)
+
+func main() {
+    floatNumber := random.RandFloat(1.0, 5.0, 2)
+    fmt.Println(floatNumber) //2.14 (random number)
+}
+```
+
+### <span id="RandFloats">RandFloats</span>
+
+<p>Generate a slice of random float64 numbers of length n that do not repeat. Number range in [min, max)</p>
+
+<b>Signature:</b>
+
+```go
+func RandFloats(length int, min, max float64, precision int) []float64
+```
+
+<b>Example:<span style="float:right;display:inline-block;">[Run](https://go.dev/play/p/I3yndUQ-rhh)</span></b>
+
+```go
+package main
+
+import (
+    "fmt"
+    "github.com/duke-git/lancet/random"
+)
+
+func main() {
+    floatNumbers := random.RandFloats(5, 1.0, 5.0, 2)
+    fmt.Println(floatNumbers) //[3.42 3.99 1.3 2.38 4.23] (random)
+}
+```
+
 ### <span id="RandUniqueIntSlice">RandUniqueIntSlice</span>

 <p>生成一个不重复的长度为n的随机int切片。</p>
@@ -272,3 +330,110 @@ func main() {
    fmt.Println(result) //[0 4 7 1 5] (random)
 }
 ```
+
+### <span id="RandIntSlice">RandIntSlice</span>
+
+<p>生成一个特定长度的随机int切片，数值范围[min, max)。</p>
+
+<b>函数签名:</b>
+
+```go
+func RandIntSlice(length, min, max int) []int
+```
+
+<b>示例:</b>
+
+```go
+package main
+
+import (
+    "fmt"
+    "github.com/duke-git/lancet/random"
+)
+
+func main() {
+    result := random.RandIntSlice(5, 0, 10)
+    fmt.Println(result) //[1 2 7 1 5] (random)
+}
+```
+
+### <span id="RandStringSlice">RandStringSlice</span>
+
+<p>生成随机字符串slice. 字符串类型需要是以下几种或者它们的组合: random.Numeral, random.LowwerLetters, random.UpperLetters random.Letters, random.SymbolChars, random.AllChars。</p>
+
+<b>函数签名:</b>
+
+```go
+func RandStringSlice(charset string, sliceLen, strLen int) []string
+```
+
+<b>实例:</b>
+
+```go
+package main
+
+import (
+    "fmt"
+    "github.com/duke-git/lancet/random"
+)
+
+func main() {
+    strs := random.RandStringSlice(random.Letters, 4, 6)
+    fmt.Println(strs)
+
+    // output random string slice like below:
+    //[CooSMq RUFjDz FAeMPf heRyGv]
+}
+```
+
+### <span id="RandBool">RandBool</span>
+
+<p>生成随机bool值(true or false)。</p>
+
+<b>函数签名:</b>
+
+```go
+func RandBool() bool
+```
+
+<b>实例:</b>
+
+```go
+package main
+
+import (
+    "fmt"
+    "github.com/duke-git/lancet/random"
+)
+
+func main() {
+    result := random.RandBool()
+    fmt.Println(result) // true or false (random)
+}
+```
+
+### <span id="RandBoolSlice">RandBoolSlice</span>
+
+<p>生成特定长度的随机bool slice。</p>
+
+<b>函数签名:</b>
+
+```go
+func RandBoolSlice(length int) []bool
+```
+
+<b>实例:</b>
+
+```go
+package main
+
+import (
+    "fmt"
+    "github.com/duke-git/lancet/random"
+)
+
+func main() {
+    result := random.RandBoolSlice(2)
+    fmt.Println(result) // [true false] (random)
+}
+```
--- a/docs/strutil.md
+++ b/docs/strutil.md
@@ -60,6 +60,10 @@ import (
 -   [RemoveWhiteSpace](#RemoveWhiteSpace)
 -   [SubInBetween](#SubInBetween)
 -   [HammingDistance](#HammingDistance)
+-   [Concat](#Concat)
+-   [Ellipsis](#Ellipsis)
+-   [Shuffle](#Shuffle)
+-   [Rotate](#Rotate)

 <div STYLE="page-break-after: always;"></div>

@@ -1340,4 +1344,128 @@ func main() {
    // 0
    // 1
 }
-```
+```
+
+### <span id="Concat">Concat</span>
+
+<p>Concatenates strings. <b>length</b> is the length of the concatenated string. If unsure, pass 0 or a negative number.</p>
+
+<b>Signature:</b>
+
+```go
+func Concat(length int, str ...string) string
+```
+
+<b>Example:</b>
+
+```go
+import (
+    "fmt"
+    "github.com/duke-git/lancet/strutil"
+)
+
+func main() {
+    result1 := strutil.Concat(12, "Hello", " ", "World", "!")
+    result2 := strutil.Concat(11, "Go", " ", "Language")
+    result3 := strutil.Concat(0, "An apple a ", "day，", "keeps the", " doctor away")
+    fmt.Println(result1)
+    fmt.Println(result2)
+    fmt.Println(result3)
+
+    // Output:
+    // Hello World!
+    // Go Language
+    // An apple a day，keeps the doctor away
+}
+```
+
+### <span id="Ellipsis">Ellipsis</span>
+
+<p>Truncates a string to a specified length and appends an ellipsis.</p>
+
+<b>Signature:</b>
+
+```go
+func Ellipsis(str string, length int) string
+```
+
+<b>Example:</b>
+
+```go
+import (
+    "fmt"
+    "github.com/duke-git/lancet/strutil"
+)
+
+func main() {
+    result1 := strutil.Ellipsis("hello world", 5)
+    result2 := strutil.Ellipsis("你好，世界!", 2)
+    result3 := strutil.Ellipsis("😀😃😄😁😆", 3)
+
+    fmt.Println(result1)
+    fmt.Println(result2)
+    fmt.Println(result3)
+
+    // Output:
+    // hello...
+    // 你好...
+    // 😀😃😄...
+}
+```
+
+### <span id="Shuffle">Shuffle</span>
+
+<p>Shuffle the order of characters of given string.</p>
+
+<b>Signature:</b>
+
+```go
+func Shuffle(str string) string
+```
+
+<b>Example:</b>
+
+```go
+import (
+    "fmt"
+    "github.com/duke-git/lancet/strutil"
+)
+
+func main() {
+    result := strutil.Shuffle("hello")
+    fmt.Println(result)  //olelh (random order)
+}
+```
+
+### <span id="Rotate">Rotate</span>
+
+<p>Rotates the string by the specified number of characters.</p>
+
+<b>Signature:</b>
+
+```go
+func Rotate(str string, shift int) string
+```
+
+<b>Example:</b>
+
+```go
+import (
+    "fmt"
+    "github.com/duke-git/lancet/strutil"
+)
+
+func main() {
+    result1 := Rotate("Hello", 0)
+    result2 := Rotate("Hello", 1)
+    result3 := Rotate("Hello", 2)
+
+    fmt.Println(result1)
+    fmt.Println(result2)
+    fmt.Println(result3)
+
+    // Output:
+    // Hello
+    // oHell
+    // loHel
+}
--- a/docs/strutil_zh-CN.md
+++ b/docs/strutil_zh-CN.md
@@ -60,6 +60,10 @@ import (
 -   [RemoveWhiteSpace](#RemoveWhiteSpace)
 -   [SubInBetween](#SubInBetween)
 -   [HammingDistance](#HammingDistance)
+-   [Concat](#Concat)
+-   [Ellipsis](#Ellipsis)
+-   [Shuffle](#Shuffle)
+-   [Rotate](#Rotate)


 <div STYLE="page-break-after: always;"></div>
@@ -1373,4 +1377,130 @@ func main() {
    // 0
    // 1
 }
+```
+
+### <span id="Concat">Concat</span>
+
+<p>拼接字符串。length是拼接后字符串的长度，如果不确定则传0或负数。</p>
+
+<b>函数签名:</b>
+
+```go
+func Concat(length int, str ...string) string
+```
+
+<b>示例:</b>
+
+```go
+import (
+    "fmt"
+    "github.com/duke-git/lancet/strutil"
+)
+
+func main() {
+
+     result1 := strutil.Concat(12, "Hello", " ", "World", "!")
+    result2 := strutil.Concat(11, "Go", " ", "Language")
+    result3 := strutil.Concat(0, "An apple a ", "day，", "keeps the", " doctor away")
+    fmt.Println(result1)
+    fmt.Println(result2)
+    fmt.Println(result3)
+
+    // Output:
+    // Hello World!
+    // Go Language
+    // An apple a day，keeps the doctor away
+}
+```
+
+### <span id="Ellipsis">Ellipsis</span>
+
+<p>将字符串截断到指定长度，并在末尾添加省略号。</p>
+
+<b>函数签名:</b>
+
+```go
+func Ellipsis(str string, length int) string
+```
+
+<b>示例:</b>
+
+```go
+import (
+    "fmt"
+    "github.com/duke-git/lancet/strutil"
+)
+
+func main() {
+    result1 := strutil.Ellipsis("hello world", 5)
+    result2 := strutil.Ellipsis("你好，世界!", 2)
+    result3 := strutil.Ellipsis("😀😃😄😁😆", 3)
+
+    fmt.Println(result1)
+    fmt.Println(result2)
+    fmt.Println(result3)
+
+    // Output:
+    // hello...
+    // 你好...
+    // 😀😃😄...
+}
+```
+
+### <span id="Shuffle">Shuffle</span>
+
+<p>打乱给定字符串中的字符顺序。</p>
+
+<b>函数签名:</b>
+
+```go
+func Shuffle(str string) string
+```
+
+<b>示例:</b>
+
+```go
+import (
+    "fmt"
+    "github.com/duke-git/lancet/strutil"
+)
+
+func main() {
+    result := strutil.Shuffle("hello")
+    fmt.Println(result)  //olelh (random order)
+}
+```
+
+### <span id="Rotate">Rotate</span>
+
+<p>按指定的字符数旋转字符串。</p>
+
+<b>函数签名:</b>
+
+```go
+func Rotate(str string, shift int) string
+```
+
+<b>示例:</b>
+
+```go
+import (
+    "fmt"
+    "github.com/duke-git/lancet/strutil"
+)
+
+func main() {
+    result1 := Rotate("Hello", 0)
+    result2 := Rotate("Hello", 1)
+    result3 := Rotate("Hello", 2)
+
+    fmt.Println(result1)
+    fmt.Println(result2)
+    fmt.Println(result3)
+
+    // Output:
+    // Hello
+    // oHell
+    // loHel
+}
 ```
--- a/random/random.go
+++ b/random/random.go
@@ -31,6 +31,25 @@ func init() {
 	rand.Seed(time.Now().UnixNano())
 }

+// RandBool generates a random boolean value (true or false).
+func RandBool() bool {
+	return rand.Intn(2) == 1
+}
+
+// RandBoolSlice generates a random boolean slice of specified length.
+func RandBoolSlice(length int) []bool {
+	if length <= 0 {
+		return []bool{}
+	}
+
+	result := make([]bool, length)
+	for i := range result {
+		result[i] = RandBool()
+	}
+
+	return result
+}
+
 // RandInt generate random int between [min, max).
 func RandInt(min, max int) int {
 	if min == max {
@@ -44,6 +63,45 @@ func RandInt(min, max int) int {
 	return rand.Intn(max-min) + min
 }

+// RandIntSlice generates a slice of random integers.
+// The generated integers are between min and max (exclusive).
+func RandIntSlice(length, min, max int) []int {
+	if length <= 0 || min > max {
+		return []int{}
+	}
+
+	result := make([]int, length)
+	for i := range result {
+		result[i] = RandInt(min, max)
+	}
+
+	return result
+}
+
+// RandUniqueIntSlice generate a slice of random int of length n that do not repeat.
+func RandUniqueIntSlice(n, min, max int) []int {
+	if min > max {
+		return []int{}
+	}
+	if n > max-min {
+		n = max - min
+	}
+
+	nums := make([]int, n)
+	used := make(map[int]struct{}, n)
+	for i := 0; i < n; {
+		r := RandInt(min, max)
+		if _, use := used[r]; use {
+			continue
+		}
+		used[r] = struct{}{}
+		nums[i] = r
+		i++
+	}
+
+	return nums
+}
+
 // RandFloat generate random float64 number between [min, max) with specific precision.
 func RandFloat(min, max float64, precision int) float64 {
 	if min == max {
@@ -59,6 +117,23 @@ func RandFloat(min, max float64, precision int) float64 {
 	return mathutil.RoundToFloat(n, precision)
 }

+// RandFloats generate a slice of random float64 numbers of length n that do not repeat.
+func RandFloats(n int, min, max float64, precision int) []float64 {
+	nums := make([]float64, n)
+	used := make(map[float64]struct{}, n)
+	for i := 0; i < n; {
+		r := RandFloat(min, max, precision)
+		if _, use := used[r]; use {
+			continue
+		}
+		used[r] = struct{}{}
+		nums[i] = r
+		i++
+	}
+
+	return nums
+}
+
 // RandBytes generate random byte slice.
 // Play: https://go.dev/play/p/EkiLESeXf8d
 func RandBytes(length int) []byte {
@@ -79,6 +154,23 @@ func RandString(length int) string {
 	return random(Letters, length)
 }

+// RandString generate a slice of random string of length strLen based on charset.
+// chartset should be one of the following: random.Numeral, random.LowwerLetters, random.UpperLetters
+// random.Letters, random.SymbolChars, random.AllChars. or a combination of them.
+func RandStringSlice(charset string, sliceLen, strLen int) []string {
+	if sliceLen <= 0 || strLen <= 0 {
+		return []string{}
+	}
+
+	result := make([]string, sliceLen)
+
+	for i := range result {
+		result[i] = random(charset, strLen)
+	}
+
+	return result
+}
+
 // RandUpper generate a random upper case string of specified length.
 func RandUpper(length int) string {
 	return random(UpperLetters, length)
@@ -176,160 +268,3 @@ func UUIdV4() (string, error) {

 	return fmt.Sprintf("%x-%x-%x-%x-%x", uuid[0:4], uuid[4:6], uuid[6:8], uuid[8:10], uuid[10:]), nil
 }
-
-// RandUniqueIntSlice generate a slice of random int of length n that do not repeat.
-func RandUniqueIntSlice(n, min, max int) []int {
-	if min > max {
-		return []int{}
-	}
-	if n > max-min {
-		n = max - min
-	}
-
-	nums := make([]int, n)
-	used := make(map[int]struct{}, n)
-	for i := 0; i < n; {
-		r := RandInt(min, max)
-		if _, use := used[r]; use {
-			continue
-		}
-		used[r] = struct{}{}
-		nums[i] = r
-		i++
-	}
-
-	return nums
-}
-
-// RandFloats generate a slice of random float64 numbers of length n that do not repeat.
-func RandFloats(n int, min, max float64, precision int) []float64 {
-	nums := make([]float64, n)
-	used := make(map[float64]struct{}, n)
-	for i := 0; i < n; {
-		r := RandFloat(min, max, precision)
-		if _, use := used[r]; use {
-			continue
-		}
-		used[r] = struct{}{}
-		nums[i] = r
-		i++
-	}
-
-	return nums
-}
-
-// const (
-// 	NUMERAL       = "0123456789"
-// 	LOWER_LETTERS = "abcdefghijklmnopqrstuvwxyz"
-// 	UPPER_LETTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
-// 	LETTERS       = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
-// )
-
-// var rn = rand.NewSource(time.Now().UnixNano())
-
-// func init() {
-// 	rand.Seed(time.Now().UnixNano())
-// }
-
-// // RandInt generate random int between min and max, maybe min,  not be max
-// func RandInt(min, max int) int {
-// 	if min == max {
-// 		return min
-// 	}
-
-// 	if max < min {
-// 		min, max = max, min
-// 	}
-
-// 	return rand.Intn(max-min) + min
-// }
-
-// // RandBytes generate random byte slice
-// func RandBytes(length int) []byte {
-// 	if length < 1 {
-// 		return []byte{}
-// 	}
-// 	b := make([]byte, length)
-
-// 	if _, err := io.ReadFull(crand.Reader, b); err != nil {
-// 		return nil
-// 	}
-// 	return b
-// }
-
-// // RandString generate random string
-// func RandString(length int) string {
-// 	return random(LETTERS, length)
-// }
-
-// // RandUpper generate a random upper case string
-// func RandUpper(length int) string {
-// 	return random(UPPER_LETTERS, length)
-// }
-
-// // RandLower generate a random lower case string
-// func RandLower(length int) string {
-// 	return random(LOWER_LETTERS, length)
-// }
-
-// // RandNumeral generate a random numeral string
-// func RandNumeral(length int) string {
-// 	return random(NUMERAL, length)
-// }
-
-// // RandNumeralOrLetter generate a random numeral or letter string
-// func RandNumeralOrLetter(length int) string {
-// 	return random(NUMERAL+LETTERS, length)
-// }
-
-// // random generate a random string based on given string range
-// func random(s string, length int) string {
-// 	b := make([]byte, length)
-
-// 	// fix: https://github.com/duke-git/lancet/issues/75
-// 	// r := rand.New(rand.NewSource(time.Now().UnixNano()))
-
-// 	for i := range b {
-// 		b[i] = s[rand.Int63()%int64(len(s))]
-// 	}
-// 	return string(b)
-// }
-
-// // UUIdV4 generate a random UUID of version 4 according to RFC 4122
-// func UUIdV4() (string, error) {
-// 	uuid := make([]byte, 16)
-
-// 	n, err := io.ReadFull(crand.Reader, uuid)
-// 	if n != len(uuid) || err != nil {
-// 		return "", err
-// 	}
-
-// 	uuid[8] = uuid[8]&^0xc0 | 0x80
-// 	uuid[6] = uuid[6]&^0xf0 | 0x40
-
-// 	return fmt.Sprintf("%x-%x-%x-%x-%x", uuid[0:4], uuid[4:6], uuid[6:8], uuid[8:10], uuid[10:]), nil
-// }
-
-// // RandUniqueIntSlice generate a slice of random int of length n that do not repeat.
-// func RandUniqueIntSlice(n, min, max int) []int {
-// 	if min > max {
-// 		return []int{}
-// 	}
-// 	if n > max-min {
-// 		n = max - min
-// 	}
-
-// 	nums := make([]int, n)
-// 	used := make(map[int]struct{}, n)
-// 	for i := 0; i < n; {
-// 		r := RandInt(min, max)
-// 		if _, use := used[r]; use {
-// 			continue
-// 		}
-// 		used[r] = struct{}{}
-// 		nums[i] = r
-// 		i++
-// 	}
-
-// 	return nums
-// }
--- a/random/random_test.go
+++ b/random/random_test.go
@@ -6,6 +6,7 @@ import (
 	"testing"

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

 func TestRandString(t *testing.T) {
@@ -138,3 +139,92 @@ func hasDuplicate(arr []int) bool {
 	}
 	return false
 }
+
+func TestRandBool(t *testing.T) {
+	t.Parallel()
+	assert := internal.NewAssert(t, "TestRandBool")
+
+	result := RandBool()
+	assert.Equal(true, result == true || result == false)
+}
+
+func TestRandBoolSlice(t *testing.T) {
+	t.Parallel()
+	assert := internal.NewAssert(t, "TestRandBoolSlice")
+
+	t.Run("empty slice", func(t *testing.T) {
+		bools := RandBoolSlice(-1)
+		assert.Equal([]bool{}, bools)
+
+		bools = RandBoolSlice(0)
+		assert.Equal([]bool{}, bools)
+	})
+
+	t.Run("random bool slice", func(t *testing.T) {
+		bools := RandBoolSlice(6)
+		assert.Equal(6, len(bools))
+
+		for _, b := range bools {
+			assert.Equal(true, b == true || b == false)
+		}
+	})
+}
+
+func TestRandStringSlice(t *testing.T) {
+	t.Parallel()
+	assert := internal.NewAssert(t, "TestRandStringSlice")
+
+	t.Run("empty slice", func(t *testing.T) {
+		strs := RandStringSlice(Letters, -1, -1)
+		assert.Equal([]string{}, strs)
+
+		strs = RandStringSlice(Letters, 0, 0)
+		assert.Equal([]string{}, strs)
+
+		strs = RandStringSlice(Letters, -1, 0)
+		assert.Equal([]string{}, strs)
+
+		strs = RandStringSlice(Letters, 0, -1)
+		assert.Equal([]string{}, strs)
+
+		strs = RandStringSlice(Letters, 1, 0)
+		assert.Equal([]string{}, strs)
+
+		strs = RandStringSlice(Letters, 0, 1)
+		assert.Equal([]string{}, strs)
+	})
+
+	t.Run("random string slice", func(t *testing.T) {
+		strs := RandStringSlice(Letters, 4, 6)
+		assert.Equal(4, len(strs))
+
+		for _, s := range strs {
+			assert.Equal(true, validator.IsAlpha(s))
+			assert.Equal(6, len(s))
+		}
+	})
+}
+
+func TestRandIntSlice(t *testing.T) {
+	t.Parallel()
+	assert := internal.NewAssert(t, "TestRandIntSlice")
+
+	t.Run("empty slice", func(t *testing.T) {
+		numbers := RandIntSlice(-1, 1, 5)
+		assert.Equal([]int{}, numbers)
+
+		numbers = RandIntSlice(0, 1, 5)
+		assert.Equal([]int{}, numbers)
+
+		numbers = RandIntSlice(3, 5, 1)
+		assert.Equal([]int{}, numbers)
+	})
+
+	t.Run("random int slice", func(t *testing.T) {
+		numbers := RandIntSlice(5, 1, 1)
+		assert.Equal([]int{1, 1, 1, 1, 1}, numbers)
+
+		numbers = RandIntSlice(5, 1, 5)
+		assert.Equal(5, len(numbers))
+	})
+}
--- a/strutil/string.go
+++ b/strutil/string.go
@@ -569,8 +569,6 @@ func HammingDistance(a, b string) (int, error) {
 // Concat uses the strings.Builder to concatenate the input strings.
 //   - `length` is the expected length of the concatenated string.
 //   - if you are unsure about the length of the string to be concatenated, please pass 0 or a negative number.
-//
-// Play: todo
 func Concat(length int, str ...string) string {
 	if len(str) == 0 {
 		return ""