Frequently asked questions about golang functions

Here are the answers to common questions about Golang functions: functions do not belong to any type, while methods belong to a specific type. A function pointer is a variable that stores the address of a function and can be used like any other pointer. Functions can return multiple values, returned as tuples. Functions can declare variable-length parameter lists using the ... syntax. Anonymous functions are functions without a name that are used to create one-time use functions.

Frequently asked questions about Golang functions

1. The difference between functions and methods

• Function: A function that does not belong to any type.
• Method: Function belonging to a specific type.

Code example:

// 函数
func add(a, b int) int {
    return a + b
}

// 方法
type Person struct {
    name string
}

func (p Person) greet() string {
    return "Hello, my name is " + p.name
}

2. Function pointer

The function pointer is a variable that stores the function address. They can be used like other pointers to call functions.

Code example:

func add(a, b int) int {
    return a + b
}

var addFunc = add // 函数指针

func main() {
    result := addFunc(1, 2) // 使用函数指针调用函数
    fmt.Println(result) // 输出: 3
}

3. Return multiple values

The function can use return Statement returns multiple values. The return value is returned as a tuple.

Code example:

func getMinMax(nums []int) (int, int) {
    min := nums[0]
    max := nums[0]
    for _, num := range nums {
        if num < min {
            min = num
        }
        if num > max {
            max = num
        }
    }
    return min, max
}

4. Variable parameter list

Function can be used... Syntax for declaring a variable length parameter list.

Code example:

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

func main() {
    result := sum(1, 2, 3, 4, 5) // 可变参数列表
    fmt.Println(result) // 输出: 15
}

5. Anonymous function

Anonymous function is a function without a name. It is typically used to create one-time use functions.

Code example:

func main() {
    // 创建匿名函数
    add := func(a, b int) int {
        return a + b
    }

    // 使用匿名函数
    result := add(1, 2)
    fmt.Println(result) // 输出: 3
}

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