Discuss how to remove the suffix of a string in Golang

In Golang, removing the suffix of a string is a common task. Fortunately, Golang provides many practical functions and methods for string operations to make operations easier.

In this article, we will explore how to remove the suffix of a string in Golang. We'll cover some basics and examples to illustrate the steps of this process.

String suffix

First, we need to understand what a string suffix is. In strings, a suffix is ​​a specific period of characters or substring that appears at the end of the string. For example, a file's suffix can be .jpg or .png, and a URL's suffix can be .html or .php.

In Golang, we can use several built-in methods of strings to obtain and manipulate the suffix of a string.

strings.HasSuffix() method

The HasSuffix() function in the strings package can be used to check whether a given string ends with a specified suffix. This function returns a boolean value that is true if the string ends with the given suffix, false otherwise. Here is an example:

package main

import (
    "fmt"
    "strings"
)

func main() {
    str := "example.txt"
    suffix := ".txt"

    // 使用 HasSuffix() 方法判断是否以指定后缀结尾
    if strings.HasSuffix(str, suffix) {
        fmt.Printf("'%s' has suffix '%s'\n", str, suffix)
    } else {
        fmt.Printf("'%s' does not have suffix '%s'\n", str, suffix)
    }
}

The output is:

'example.txt' has suffix '.txt'

strings.TrimSuffix() method

Another useful string method is TrimSuffix (). This method is used to remove a specific suffix, if present. It returns the modified string, the original string has not been changed.

package main

import (
    "fmt"
    "strings"
)

func main() {
    str := "example.txt"
    suffix := ".txt"

    // 使用 TrimSuffix() 方法删除指定后缀
    newStr := strings.TrimSuffix(str, suffix)
    fmt.Println(newStr)
}

The output result is:

example

In the above example, we passed the string "example.txt" as a parameter to the TrimSuffix() method, and specified " when calling the method .txt" as the suffix. Since this string ends with ".txt", the resulting string is "example".

strings.SplitN() method

Another way to get the suffix is ​​to use the strings.SplitN() method. This method splits the string using the specified delimiter and returns a string slice. The last element is the last part separated by the separator, which is the suffix.

The following is an example:

package main

import (
    "fmt"
    "strings"
)

func main() {
    str := "example.txt"
    sep := "."

    // 使用 SplitN() 方法获取分隔符分隔的最后一部分，即后缀
    parts := strings.SplitN(str, sep, -1)
    fmt.Println(parts[len(parts)-1])
}

The output result is:

txt

In the above code, we use the delimiter "." to split the string "example." txt" and store the results in a string slice named "parts". To get the suffix, we only need to access the last element of the slice, which is the suffix.

The above are three methods for removing string suffixes in Golang. You can choose to use the appropriate method according to the specific situation. These methods are very simple, and we hope this article can provide some convenience to Golang developers who need to operate strings.

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