Use the strings.HasPrefix function in golang to determine whether a string starts with a certain prefix

Use the strings.HasPrefix function in golang to determine whether a string begins with a certain prefix

In golang, the strings.HasPrefix function can help us determine a string Whether to start with the specified prefix. I often use this function at work to determine whether a file path meets the requirements. The following is the specific usage and code example of this function.

Function introduction

Function name: HasPrefix
Function function: Determine whether the string s starts with prefix
Function parameters: s string - the string to be judged; prefix string - Prefix string
Function return value: bool - whether the string s begins with prefix

Function code example

The following is a sample code using this function:

package main

import (

"fmt"
"strings"

)

func main(){

str1 := "/usr/local/go/bin/go"
str2 := "/usr/local/go/src"
api1 := "/api/v1/user"
api2 := "/api/v2/user"

// 判断str1是否以指定的前缀"/usr"开头
if strings.HasPrefix(str1, "/usr"){
    fmt.Printf("str1以/usr开头

")

} else {
    fmt.Printf("str1不以/usr开头

")

}

// 判断str2是否以指定的前缀"/usr"开头
if strings.HasPrefix(str2, "/usr"){
    fmt.Printf("str2以/usr开头

")

} else {
    fmt.Printf("str2不以/usr开头

")

}

// 判断api1是否以指定的前缀"/api/v1"开头
if strings.HasPrefix(api1, "/api/v1"){
    fmt.Printf("api1以/api/v1开头

")

} else {
    fmt.Printf("api1不以/api/v1开头

")

}

// 判断api2是否以指定的前缀"/api/v1"开头
if strings.HasPrefix(api2, "/api/v1"){
    fmt.Printf("api2以/api/v1开头

")

} else {
    fmt.Printf("api2不以/api/v1开头

")

}

}

Output result:

str1 starts with /usr
str2 starts with /usr
api1 starts with /api/v1
api2 Not starting with /api/v1

As you can see from the output, the strings.HasPrefix function can easily determine whether a string starts with the specified prefix. In actual work, we can use this function flexibly according to business needs, thereby improving the readability and execution efficiency of the code.

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