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doc: update doc for datetime fileutil formatter function package

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dudaodong
2023-08-25 14:31:49 +08:00
parent 8ad374bb21
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# Fileutil
Package fileutil implements some basic functions for file operations.
<div STYLE="page-break-after: always;"></div>
## Source:
- [https://github.com/duke-git/lancet/blob/main/fileutil/file.go](https://github.com/duke-git/lancet/blob/main/fileutil/file.go)
<div STYLE="page-break-after: always;"></div>
## Usage:
```go
import (
"github.com/duke-git/lancet/v2/fileutil"
)
```
<div STYLE="page-break-after: always;"></div>
## Index
- [ClearFile](#ClearFile)
- [CreateFile](#CreateFile)
- [CreateDir](#CreateDir)
- [CopyFile](#CopyFile)
- [CurrentPath](#CurrentPath)
- [FileMode](#FileMode)
- [MiMeType](#MiMeType)
- [IsExist](#IsExist)
- [IsLink](#IsLink)
- [IsDir](#IsDir)
- [ListFileNames](#ListFileNames)
- [RemoveFile](#RemoveFile)
- [ReadFileToString](#ReadFileToString)
- [ReadFileByLine](#ReadFileByLine)
- [Zip](#Zip)
- [ZipAppendEntry](#ZipAppendEntry)
- [UnZip](#UnZip)
- [IsZipFile](#IsZipFile)
- [FileSize](#FileSize)
- [MTime](#MTime)
- [Sha](#Sha)
- [ReadCsvFile](#ReadCsvFile)
- [WriteCsvFile](#WriteCsvFile)
- [WriteStringToFile](#WriteStringToFile)
- [WriteBytesToFile](#WriteBytesToFile)
<div STYLE="page-break-after: always;"></div>
<link rel="stylesheet" type="text/css" href="/styles/api_doc.css">
## Documentation
### <span id="ClearFile">ClearFile</span>
<p>Clear the file content, write empty string to the file.</p>
<b>Signature:</b>
```go
func ClearFile(path string) error
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/NRZ0ZT-G94H)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
err := fileutil.ClearFile("./test.txt")
if err != nil {
fmt.Println(err)
}
}
```
### <span id="CreateFile">CreateFile</span>
<p>Create file in path. return true if create succeed.</p>
<b>Signature:</b>
```go
func CreateFile(path string) bool
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/lDt8PEsTNKI)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
isCreatedSucceed := fileutil.CreateFile("./test.txt")
fmt.Println(isCreatedSucceed)
}
```
### <span id="CreateDir">CreateDir</span>
<p>Create directory in absolute path. param `absPath` like /a, /a/b.</p>
<b>Signature:</b>
```go
func CreateDir(absPath string) error
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/qUuCe1OGQnM)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
err := fileutil.CreateDir("/a/b") // will create folder /a/b
fmt.Println(err)
}
```
### <span id="CopyFile">CopyFile</span>
<p>Copy src file to dest file. If dest file exist will overwrite it.</p>
<b>Signature:</b>
```go
func CopyFile(srcPath string, dstPath string) error
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/Jg9AMJMLrJi)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
err := fileutil.CopyFile("./test.txt", "./test_copy.txt")
if err != nil {
fmt.Println(err)
}
}
```
### <span id="CurrentPath">CurrentPath</span>
<p>return current absolute path.</p>
<b>Signature:</b>
```go
func CurrentPath() string
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/s74a9iBGcSw)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
absPath := CurrentPath()
fmt.Println(absPath)
}
```
### <span id="FileMode">FileMode</span>
<p>Return file mode infomation.</p>
<b>Signature:</b>
```go
func FileMode(path string) (fs.FileMode, error)
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/2l2hI42fA3p)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
mode, err := fileutil.FileMode("./test.txt")
if err != nil {
fmt.Println(err)
}
fmt.Println(mode)
}
```
### <span id="MiMeType">MiMeType</span>
<p>Get file mime type, 'file' param's type should be string or *os.File.</p>
<b>Signature:</b>
```go
func MiMeType(file any) string
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/bd5sevSUZNu)</span></b>
```go
package main
import (
"fmt"
"os"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
type1 := fileutil.MiMeType("./test.txt")
fmt.Println(type1) //text/plain; charset=utf-8
f, _ := os.Open("./file.go")
type2 := fileutil.MiMeType(f)
fmt.Println(type2) //text/plain; charset=utf-8
}
```
### <span id="IsExist">IsExist</span>
<p>Checks if a file or directory exists.</p>
<b>Signature:</b>
```go
func IsExist(path string) bool
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/nKKXt8ZQbmh)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
fileutil.CreateFile("./test.txt")
isFileExist := fileutil.IsExist("./test.txt")
fmt.Println(isFileExist) //true
}
```
### <span id="IsLink">IsLink</span>
<p>Checks if a file is symbol link or not.</p>
<b>Signature:</b>
```go
func IsLink(path string) bool
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/TL-b-Kzvf44)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
isLinkFile := fileutil.IsLink("./test.txt")
fmt.Println(isLinkFile) //false
}
```
### <span id="IsDir">IsDir</span>
<p>Checks if the path is directy or not.</p>
<b>Signature:</b>
```go
func IsDir(path string) bool
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/WkVwEKqtOWk)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
isDir := fileutil.IsDir("./")
fmt.Println(isDir) //true
isDir = fileutil.IsDir("./test.txt")
fmt.Println(isDir) //false
}
```
### <span id="ListFileNames">ListFileNames</span>
<p>List all file names in given path.</p>
<b>Signature:</b>
```go
func ListFileNames(path string) ([]string, error)
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/Tjd7Y07rejl)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
fileNames, _ := fileutil.ListFileNames("./")
fmt.Println(fileNames)
}
```
### <span id="RemoveFile">RemoveFile</span>
<p>Remove the file of path.</p>
<b>Signature:</b>
```go
func RemoveFile(path string) error
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/P2y0XW8a1SH)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
err := fileutil.RemoveFile("./test.txt")
if err != nil {
fmt.Println(err)
}
}
```
### <span id="ReadFileToString">ReadFileToString</span>
<p>Return string of file content.</p>
<b>Signature:</b>
```go
func ReadFileToString(path string) (string, error)
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/cmfwp_5SQTp)</span></b>
```go
package main
import (
"fmt"
"os"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
path := "./test.txt"
fileutil.CreateFile(path)
f, _ := os.OpenFile(path, os.O_WRONLY|os.O_TRUNC, 0777)
f.WriteString("hello world")
content, _ := fileutil.ReadFileToString(path)
fmt.Println(content) //hello world
}
```
### <span id="ReadFileByLine">ReadFileByLine</span>
<p>Read file line by line, and return slice of lines</p>
<b>Signature:</b>
```go
func ReadFileByLine(path string)([]string, error)
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/svJP_7ZrBrD)</span></b>
```go
package main
import (
"fmt"
"os"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
path := "./text.txt"
fileutil.CreateFile(path)
f, _ := os.OpenFile(path, os.O_WRONLY|os.O_TRUNC, 0777)
defer f.Close()
f.WriteString("hello\nworld")
contents, _ := fileutil.ReadFileByLine(path)
fmt.Println(contents) //[]string{"hello", "world"}
}
```
### <span id="Zip">Zip</span>
<p>Create a zip file of fpath, fpath could be a file or a directory.</p>
<b>Signature:</b>
```go
func Zip(fpath string, destPath string) error
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/j-3sWBp8ik_P)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
err := fileutil.Zip("./test.txt", "./test.zip")
if err != nil {
fmt.Println(err)
}
}
```
### <span id="ZipAppendEntry">ZipAppendEntry</span>
<p>Append a single file or directory by fpath to an existing zip file.</p>
<b>Signature:</b>
```go
func ZipAppendEntry(fpath string, destPath string) error
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/cxvaT8TRNQp)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
err := fileutil.ZipAppendEntry("./test.txt", "./test.zip")
if err != nil {
fmt.Println(err)
}
}
```
### <span id="UnZip">UnZip</span>
<p>Unzip the file and save it to dest path.</p>
<b>Signature:</b>
```go
func UnZip(zipFile string, destPath string) error
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/g0w34kS7B8m)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
err := fileutil.Zip("./test.zip", "./unzip/test.txt")
if err != nil {
fmt.Println(err)
}
}
```
### <span id="IsZipFile">IsZipFile</span>
<p>Checks if file is zip file or not.</p>
<b>Signature:</b>
```go
func IsZipFile(filepath string) bool
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/9M0g2j_uF_e)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
isZip := fileutil.IsZipFile("./zipfile.zip")
fmt.Println(isZip)
}
```
### <span id="FileSize">FileSize</span>
<p>Returns file size in bytes.</p>
<b>Signature:</b>
```go
func FileSize(path string) (int64, error)
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/H9Z05uD-Jjc)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
size, err := fileutil.FileSize("./testdata/test.txt")
fmt.Println(size)
fmt.Println(err)
// Output:
// 20
// <nil>
}
```
### <span id="MTime">MTime</span>
<p>Returns file modified time(unix timestamp).</p>
<b>Signature:</b>
```go
func MTime(filepath string) (int64, error)
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/s_Tl7lZoAaY)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
mtime, err := fileutil.MTime("./testdata/test.txt")
fmt.Println(mtime)
fmt.Println(err)
// Output:
// 1682391110
// <nil>
}
```
### <span id="Sha">Sha</span>
<p>returns file sha value, param `shaType` should be 1, 256 or 512.</p>
<b>Signature:</b>
```go
func Sha(filepath string, shaType ...int) (string, error)
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/VfEEcO2MJYf)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
sha1, err := fileutil.Sha("./testdata/test.txt", 1)
sha256, _ := fileutil.Sha("./testdata/test.txt", 256)
sha512, _ := fileutil.Sha("./testdata/test.txt", 512)
fmt.Println(sha1)
fmt.Println(sha256)
fmt.Println(sha512)
fmt.Println(err)
// Output:
// dda3cf10c5a6ff6c6659a497bf7261b287af2bc7
// aa6d0a3fbc3442c228d606da09e0c1dc98c69a1cac3da1909199e0266171df35
// d22aba2a1b7a2e2f512756255cc1c3708905646920cb1eb95e45b531ba74774dbbb89baebf1f716220eb9cf4908f1cfc5b2a01267704d9a59f59d77cab609870
// <nil>
}
```
### <span id="ReadCsvFile">ReadCsvFile</span>
<p>Reads file content into slice.</p>
<b>Signature:</b>
```go
func ReadCsvFile(filepath string) ([][]string, error)
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/OExTkhGEd3_u)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
content, err := fileutil.ReadCsvFile("./testdata/test.csv")
fmt.Println(content)
fmt.Println(err)
// Output:
// [[Bob 12 male] [Duke 14 male] [Lucy 16 female]]
// <nil>
}
```
### <span id="WriteCsvFile">WriteCsvFile</span>
<p>Write content to target csv file.</p>
<b>Signature:</b>
```go
func WriteCsvFile(filepath string, records [][]string, append bool) error
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/dAXm58Q5U1o)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
fpath := "./test.csv"
fileutil.CreateFile(fpath)
f, _ := os.OpenFile(fpath, os.O_WRONLY|os.O_TRUNC, 0777)
defer f.Close()
data := [][]string{
{"Lili", "22", "female"},
{"Jim", "21", "male"},
}
err := fileutil.WriteCsvFile(fpath, data, false)
if err != nil {
return
}
content, err := fileutil.ReadCsvFile(fpath)
if err != nil {
return
}
fmt.Println(content)
// Output:
// [[Lili 22 female] [Jim 21 male]]
}
```
### <span id="WriteBytesToFile">WriteBytesToFile</span>
<p>Writes bytes to target file.</p>
<b>Signature:</b>
```go
func WriteBytesToFile(filepath string, content []byte) error
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/s7QlDxMj3P8)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
filepath := "./bytes.txt"
file, err := os.Create(filepath)
if err != nil {
return
}
defer file.Close()
err = fileutil.WriteBytesToFile(filepath, []byte("hello"))
if err != nil {
return
}
content, err := fileutil.ReadFileToString(filepath)
if err != nil {
return
}
os.Remove(filepath)
fmt.Println(content)
// Output:
// hello
}
```
### <span id="WriteStringToFile">WriteStringToFile</span>
<p>Writes string to target file.</p>
<b>Signature:</b>
```go
func WriteStringToFile(filepath string, content string, append bool) error
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/GhLS6d8lH_g)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/fileutil"
)
func main() {
filepath := "./test.txt"
file, err := os.Create(filepath)
if err != nil {
return
}
defer file.Close()
err = fileutil.WriteStringToFile(filepath, "hello", true)
if err != nil {
return
}
content, err := fileutil.ReadFileToString(filepath)
if err != nil {
return
}
os.Remove(filepath)
fmt.Println(content)
// Output:
// hello
}
```

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# Formatter
formatter contains some functions for data formatting.
<div STYLE="page-break-after: always;"></div>
## Source:
- [https://github.com/duke-git/lancet/blob/main/formatter/formatter.go](https://github.com/duke-git/lancet/blob/main/formatter/formatter.go)
- [https://github.com/duke-git/lancet/blob/main/formatter/byte.go](https://github.com/duke-git/lancet/blob/main/formatter/byte.go)
<div STYLE="page-break-after: always;"></div>
## Usage:
```go
import (
"github.com/duke-git/lancet/v2/formatter"
)
```
<div STYLE="page-break-after: always;"></div>
## Index
- [Comma](#Comma)
- [Pretty](#Pretty)
- [PrettyToWriter](#PrettyToWriter)
- [DecimalBytes](#DecimalBytes)
- [BinaryBytes](#BinaryBytes)
- [ParseDecimalBytes](#ParseDecimalBytes)
- [ParseBinaryBytes](#ParseBinaryBytes)
<div STYLE="page-break-after: always;"></div>
<link rel="stylesheet" type="text/css" href="/styles/api_doc.css">
## Documentation
### <span id="Comma">Comma</span>
<p>Add comma to a number value by every 3 numbers from right to left. ahead by symbol char. if value is a invalid number string like "aa", return empty string.</p>
<b>Signature:</b>
```go
func Comma[T constraints.Float | constraints.Integer | string](value T, symbol string) string
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/eRD5k2vzUVX)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/formatter"
)
func main() {
result1 := formatter.Comma("123", "")
result2 := formatter.Comma("12345", "$")
result3 := formatter.Comma(1234567, "￥")
fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
// Output:
// 123
// $12,345
// ￥1,234,567
}
```
### <span id="Pretty">Pretty</span>
<p>Pretty data to JSON string.</p>
<b>Signature:</b>
```go
func Pretty(v any) (string, error)
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/YsciGj3FH2x)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/formatter"
)
func main() {
result1, _ := formatter.Pretty([]string{"a", "b", "c"})
result2, _ := formatter.Pretty(map[string]int{"a": 1})
fmt.Println(result1)
fmt.Println(result2)
// Output:
// [
// "a",
// "b",
// "c"
// ]
// {
// "a": 1
// }
}
```
### <span id="PrettyToWriter">PrettyToWriter</span>
<p>Pretty encode data to writer.</p>
<b>Signature:</b>
```go
func PrettyToWriter(v any, out io.Writer) error
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/LPLZ3lDi5ma)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/formatter"
)
func main() {
type User struct {
Name string `json:"name"`
Aage uint `json:"age"`
}
user := User{Name: "King", Aage: 10000}
buf := &bytes.Buffer{}
err := formatter.PrettyToWriter(user, buf)
fmt.Println(buf)
fmt.Println(err)
// Output:
// {
// "name": "King",
// "age": 10000
// }
//
// <nil>
}
```
### <span id="DecimalBytes">DecimalBytes</span>
<p>Returns a human readable byte size under decimal standard (base 1000). The precision parameter specifies the number of digits after the decimal point, which is 4 for default.</p>
<b>Signature:</b>
```go
func DecimalBytes(size float64, precision ...int) string
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/FPXs1suwRcs)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/formatter"
)
func main() {
result1 := formatter.DecimalBytes(1000)
result2 := formatter.DecimalBytes(1024)
result3 := formatter.DecimalBytes(1234567)
result4 := formatter.DecimalBytes(1234567, 3)
fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)
// Output:
// 1KB
// 1.024KB
// 1.2346MB
// 1.235MB
}
```
### <span id="BinaryBytes">BinaryBytes</span>
<p>Returns a human readable byte size under binary standard (base 1024). The precision parameter specifies the number of digits after the decimal point, which is 4 for default.</p>
<b>Signature:</b>
```go
func BinaryBytes(size float64, precision ...int) string
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/G9oHHMCAZxP)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/formatter"
)
func main() {
result1 := formatter.BinaryBytes(1024)
result2 := formatter.BinaryBytes(1024 * 1024)
result3 := formatter.BinaryBytes(1234567)
result4 := formatter.BinaryBytes(1234567, 2)
fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)
// Output:
// 1KiB
// 1MiB
// 1.1774MiB
// 1.18MiB
}
```
### <span id="ParseDecimalBytes">ParseDecimalBytes</span>
<p>Returns the human readable bytes size string into the amount it represents(base 1000).</p>
<b>Signature:</b>
```go
func ParseDecimalBytes(size string) (uint64, error)
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/Am98ybWjvjj)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/formatter"
)
func main() {
result1, _ := formatter.ParseDecimalBytes("12")
result2, _ := formatter.ParseDecimalBytes("12k")
result3, _ := formatter.ParseDecimalBytes("12 Kb")
result4, _ := formatter.ParseDecimalBytes("12.2 kb")
fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)
// Output:
// 12
// 12000
// 12000
// 12200
}
```
### <span id="ParseBinaryBytes">ParseBinaryBytes</span>
<p>Returns the human readable bytes size string into the amount it represents(base 1024).</p>
<b>Signature:</b>
```go
func ParseBinaryBytes(size string) (uint64, error)
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/69v1tTT62x8)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/formatter"
)
func main() {
result1, _ := formatter.ParseBinaryBytes("12")
result2, _ := formatter.ParseBinaryBytes("12ki")
result3, _ := formatter.ParseBinaryBytes("12 KiB")
result4, _ := formatter.ParseBinaryBytes("12.2 kib")
fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)
// Output:
// 12
// 12288
// 12288
// 12492
}
```

406
docs/en/api/packages/function.md Normal file
View File

@@ -0,0 +1,406 @@
# Function
Package function can control the flow of function execution and support part of functional programming.
<div STYLE="page-break-after: always;"></div>
## Source:
- [https://github.com/duke-git/lancet/blob/main/function/function.go](https://github.com/duke-git/lancet/blob/main/function/function.go)
- [https://github.com/duke-git/lancet/blob/main/function/watcher.go](https://github.com/duke-git/lancet/blob/main/function/watcher.go)
<div STYLE="page-break-after: always;"></div>
## Usage:
```go
import (
"github.com/duke-git/lancet/v2/function"
)
```
<div STYLE="page-break-after: always;"></div>
## Index
- [After](#After)
- [Before](#Before)
- [CurryFn](#CurryFn)
- [Compose](#Compose)
- [Debounced](#Debounced)
- [Delay](#Delay)
- [Schedule](#Schedule)
- [Pipeline](#Pipeline)
- [Watcher](#Watcher)
<div STYLE="page-break-after: always;"></div>
<link rel="stylesheet" type="text/css" href="/styles/api_doc.css">
## Documentation
### <span id="After">After</span>
<p>Creates a function that invokes given func once it's called n or more times.</p>
<b>Signature:</b>
```go
func After(n int, fn any) func(args ...any) []reflect.Value
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/eRD5k2vzUVX)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/function"
)
func main() {
fn := function.After(2, func() {
fmt.Println("hello")
})
fn()
fn()
// Output:
// hello
}
```
### <span id="Before">Before</span>
<p>creates a function that invokes func once it's called less than n times.</p>
<b>Signature:</b>
```go
func Before(n int, fn any) func(args ...any) []reflect.Value
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/0HqUDIFZ3IL)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/function"
)
func main() {
fn := function.Before(2, func() {
fmt.Println("hello")
})
fn()
fn()
fn()
fn()
// Output:
// hello
// hello
}
```
### <span id="CurryFn">CurryFn</span>
<p>Make curry function.</p>
<b>Signature:</b>
```go
type CurryFn[T any] func(...T) T
func (cf CurryFn[T]) New(val T) func(...T) T
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/5HopfDwANKX)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/function"
)
func main() {
add := func(a, b int) int {
return a + b
}
var addCurry function.CurryFn[int] = func(values ...int) int {
return add(values[0], values[1])
}
add1 := addCurry.New(1)
result := add1(2)
fmt.Println(result)
// Output:
// 3
}
```
### <span id="Compose">Compose</span>
<p>Compose the function list from right to left, then return the composed function.</p>
<b>Signature:</b>
```go
func Compose[T any](fnList ...func(...T) T) func(...T) T
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/KKfugD4PKYF)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/function"
)
func main() {
toUpper := func(strs ...string) string {
return strings.ToUpper(strs[0])
}
toLower := func(strs ...string) string {
return strings.ToLower(strs[0])
}
transform := function.Compose(toUpper, toLower)
result := transform("aBCde")
fmt.Println(result)
// Output:
// ABCDE
}
```
### <span id="Debounced">Debounced</span>
<p>Creates a debounced function that delays invoking fn until after wait duration have elapsed since the last time the debounced function was invoked.</p>
<b>Signature:</b>
```go
func Debounced(fn func(), duration time.Duration) func()
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/absuEGB_GN7)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/function"
)
func main() {
count := 0
add := func() {
count++
}
debouncedAdd := function.Debounced(add, 50*time.Microsecond)
debouncedAdd()
debouncedAdd()
debouncedAdd()
debouncedAdd()
time.Sleep(100 * time.Millisecond)
fmt.Println(count)
debouncedAdd()
time.Sleep(100 * time.Millisecond)
fmt.Println(count)
// Output:
// 1
// 2
}
```
### <span id="Delay">Delay</span>
<p>Invoke function after delayed time.</p>
<b>Signature:</b>
```go
func Delay(delay time.Duration, fn any, args ...any)
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/Ivtc2ZE-Tye)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/function"
)
func main() {
var print = func(s string) {
fmt.Println(s)
}
function.Delay(2*time.Second, print, "hello")
// Output:
// hello
}
```
### <span id="Schedule">Schedule</span>
<p>Invoke function every duration time, until close the returned bool chan.</p>
<b>Signature:</b>
```go
func Schedule(d time.Duration, fn any, args ...any) chan bool
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/hbON-Xeyn5N)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/function"
)
func main() {
count := 0
increase := func() {
count++
}
stop := function.Schedule(2*time.Second, increase)
time.Sleep(2 * time.Second)
close(stop)
fmt.Println(count)
// Output:
// 2
}
```
### <span id="Pipeline">Pipeline</span>
<p>Pipeline takes a list of functions and returns a function whose param will be passed into
the functions one by one.</p>
<b>Signature:</b>
```go
func Pipeline[T any](funcs ...func(T) T) func(T) T
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/mPdUVvj6HD6)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/function"
)
func main() {
addOne := func(x int) int {
return x + 1
}
double := func(x int) int {
return 2 * x
}
square := func(x int) int {
return x * x
}
fn := function.Pipeline(addOne, double, square)
result := fn(2)
fmt.Println(result)
// Output:
// 36
}
```
### <span id="Watcher">Watcher</span>
<p>Watcher is used for record code excution time. can start/stop/reset the watch timer. get the elapsed time of function execution.</p>
<b>Signature:</b>
```go
type Watcher struct {
startTime int64
stopTime int64
excuting bool
}
func NewWatcher() *Watcher
func (w *Watcher) Start() //start the watcher
func (w *Watcher) Stop() //stop the watcher
func (w *Watcher) Reset() //reset the watcher
func (w *Watcher) GetElapsedTime() time.Duration //get the elapsed time of function execution
```
<b>Example:<span class="run-container">[Run](https://go.dev/play/p/l2yrOpCLd1I)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/function"
)
func main() {
w := function.NewWatcher()
w.Start()
longRunningTask()
fmt.Println(w.excuting) //true
w.Stop()
eapsedTime := w.GetElapsedTime().Milliseconds()
fmt.Println(eapsedTime)
w.Reset()
}
func longRunningTask() {
var slice []int64
for i := 0; i < 10000000; i++ {
slice = append(slice, int64(i))
}
}
```