Understand what functions are supported by Go language?

"Understand what functions are supported by Go language? 》

As a modern programming language, Go language supports rich function functions, which can help developers write code and implement logic more efficiently. This article will introduce commonly used functions in Go language and their sample codes to help readers better understand how to use Go language functions.

1. Ordinary functions

In Go language, the definition format of functions is as follows:

func 函数名(参数列表) 返回值类型 {
    // 函数体
}

Sample code:

func add(x, y int) int {
    return x + y
}

func main() {
    result := add(3, 5)
    fmt.Println(result) // 输出8
}

2. Anonymous functions

Anonymous function is a function that does not need to be named. It can be defined and called directly in the code and is very flexible.

Sample code:

func main() {
    add := func(x, y int) int {
        return x + y
    }

    result := add(3, 5)
    fmt.Println(result) // 输出8
}

3. Closure function

A closure is a function value that refers to variables outside the function body. Closures provide access to variables in the scope of an external function.

Sample code:

func adder() func(int) int {
    sum := 0
    return func(x int) int {
        sum += x
        return sum
    }
}

func main() {
    add := adder()
    fmt.Println(add(3)) // 输出3
    fmt.Println(add(5)) // 输出8
}

4. Multiple return value functions

In Go language, functions can return multiple values, which is useful for some functions that need to return multiple results. Very convenient.

Sample code:

func swap(x, y string) (string, string) {
    return y, x
}

func main() {
    a, b := swap("hello", "world")
    fmt.Println(a, b) // 输出world hello
}

5. Variable parameter function

The variable parameter function can accept any number of parameters, and multiple parameters can be passed in when calling.

Sample code:

func sum(nums ...int) int {
    total := 0
    for _, num := range nums {
        total += num
    }
    return total
}

func main() {
    fmt.Println(sum(1, 2, 3)) // 输出6
    fmt.Println(sum(1, 2, 3, 4, 5)) // 输出15
}

Through the above sample code, readers can learn about some common function types supported by Go language and how to use them. Functions are a very important concept in the Go language. Mastering the use of functions can help developers better write efficient and clear code. I hope this article will be helpful to readers and allow everyone to better understand and master the functions in the Go language.

The above is the detailed content of Understand what functions are supported by Go language?. For more information, please follow other related articles on the PHP Chinese website!