How to use golang anonymous functions

Anonymous functions have no names in Go and can be passed as parameters to other functions. Usage: Syntax: func([parameter list]) ([return value list]) { // Function body } Parameters and return values ​​can be omitted. Can be passed directly to other functions. Practical case: When sorting a list, you can compare elements through anonymous functions.

Usage of anonymous functions

In the Go language, an anonymous function is a special type of function that has no name. And usually used as parameters of other functions. They can appear where function pointers are used, such as callback functions.

Usage

The syntax of the anonymous function is as follows:

func([参数列表]) ([返回值列表]) {
    // 函数体
}

where [parameter list] and [return value List] is optional. When omitted, the anonymous function has no parameters or return value.

Example

We take an anonymous function that calculates the sum of two numbers as an example:

sum := func(a, b int) int {
    return a + b
}

We can also pass the anonymous function directly to Other functions, as follows:

otherFunction(func(i int) bool {
    return i % 2 == 0
})

This anonymous bool function checks whether an integer is even.

Practical Case

Let us consider an example of sorting a list of strings:

// 比较两个字符串的函数
compareStrings := func(a, b string) int {
    return strings.Compare(a, b)
}

// 使用 sort.Slice 对字符串列表进行排序
strings := []string{"apple", "banana", "cherry"}
sort.Slice(strings, compareStrings)

fmt.Print(strings) // [apple banana cherry]

In the above code, we declare an anonymous function compareStrings, which is used to compare two strings. We then pass this function to the sort.Slice function, which sorts the list of strings using an anonymous function.

Anonymous functions are very useful in Go, they can make the code cleaner and easier to read.

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