What functions are there for string operations in Go language?

The Go language is a relatively new programming language that provides rich functionality for string operations. This article will introduce commonly used string manipulation functions in Go language.

1. len function

The len function is a function built into the Go language, used to return the length of a string. Its usage is very simple, just pass in the string as a parameter.

Example:

package main

import "fmt"

func main() {
    str := "Hello, World!"
    fmt.Println(len(str)) // 输出：13
}

2. strings.Contains function

The strings.Contains function is used to check whether a string contains another string. Its return value is a Boolean type, indicating whether it is included.

Example:

package main

import (
    "fmt"
    "strings"
)

func main() {
    str := "Hello, World!"
    fmt.Println(strings.Contains(str, "World")) // 输出：true
}

3. strings.HasPrefix and strings.HasSuffix functions

The strings.HasPrefix function is used to check whether a string starts with another character string begins, and the strings.HasSuffix function is used to check whether a string ends with another string.

Example:

package main

import (
    "fmt"
    "strings"
)

func main() {
    str := "Hello, World!"
    fmt.Println(strings.HasPrefix(str, "Hello")) // 输出：true
    fmt.Println(strings.HasSuffix(str, "World!")) // 输出：true
}

4. strings.Index and strings.LastIndex functions

The strings.Index function is used to find a string within another string position in , it returns the position of the first occurrence. If not, returns -1. The strings.LastIndex function returns the position of the last occurrence.

Example:

package main

import (
    "fmt"
    "strings"
)

func main() {
    str := "Hello, World!"
    fmt.Println(strings.Index(str, "o"))     // 输出：4
    fmt.Println(strings.LastIndex(str, "o")) // 输出：8
}

5. strings.Replace function

The strings.Replace function is used to replace one string with another. It accepts three parameters: the string to be replaced, the replaced string, and the replaced string. If you need to replace all occurrences of the string, set the fourth parameter to -1.

Example:

package main

import (
    "fmt"
    "strings"
)

func main() {
    str := "Hello, World!"
    fmt.Println(strings.Replace(str, "Hello", "Hi", 1))  // 输出：Hi, World!
    fmt.Println(strings.Replace(str, "o", "z", -1))     // 输出：Hellz, Wzrld!
}

6. strings.Split function

strings.Split function is used to split a string according to the specified delimiter, and Returns an array of strings.

Example:

package main

import (
    "fmt"
    "strings"
)

func main() {
    str := "Hello,World!"
    arr := strings.Split(str, ",")
    fmt.Println(arr) // 输出：[Hello World!]
}

7. strings.Join function

strings.Join function is used to join a string array into a large string, and Adds the specified delimiter between array elements.

Example:

package main

import (
    "fmt"
    "strings"
)

func main() {
    arr := []string{"Hello", "World!"}
    str := strings.Join(arr, ", ")
    fmt.Println(str) // 输出：Hello, World!
}

8. strconv.Itoa and strconv.Atoi functions

strconv.Itoa function is used to convert an integer to a string, while strconv.Atoi is used to convert a string to an integer.

Example:

package main

import (
    "fmt"
    "strconv"
)

func main() {
    num := 123
    str := strconv.Itoa(num)
    fmt.Println(str) // 输出：123

    str = "456"
    num, _ = strconv.Atoi(str)
    fmt.Println(num) // 输出：456
}

Summary:

This article introduces the commonly used string operation functions in the Go language, including len, strings.Contains, strings.HasPrefix, strings.HasSuffix , strings.Index, strings.LastIndex, strings.Replace, strings.Split, strings.Join, strconv.Itoa and strconv.Atoi functions. These functions are powerful, simple and convenient to use, and can greatly facilitate code writing.

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