golang function function passed as parameter

In Go, functions can be passed as parameters to enhance code reusability and maintainability. Syntax: Pass the value of function type, that is, func (parameter list) return value type. Practical case: The function Exclaim takes a string as a parameter, prints the string and adds an exclamation mark. The function PrintWithExcitement receives a function parameter f and uses it to print the string parameter s.

Passing functions as parameters in Go

In Go, you can pass a function as a parameter to another function. This allows the creation of reusable and modular code, thereby enhancing code readability and maintainability.

Syntax

To pass a function as a parameter, simply pass it as a value of the function type. The syntax for function types is as follows:

func(参数列表) 返回值类型

For example, consider the following function, which receives a function as a parameter and uses it to print a message:

func PrintMessage(f func(string)) {
    f("Hello, world!")
}

Practical case

Here is a Practical case showing how to create a function and pass it as a parameter to another function:

package main

import "fmt"

// 定义一个函数并将其作为参数传递
func Exclaim(s string) {
    fmt.Println(s + "!")
}

// 定义一个函数，它接收一个函数作为参数
func PrintWithExcitement(s string, f func(string)) {
    f(s)
}

func main() {
    // 传递 Exclaim 函数作为参数
    PrintWithExcitement("Hello", Exclaim)
}

Running the above code will output:

Hello!

This code shows how to define a functionExclaim and pass it as a parameter to function PrintWithExcitement. Then, PrintWithExcitement calls the Exclaim function to print the message "Hello!" followed by an exclamation mark.

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