Explore the function types and usage supported by Go language

Title: Explore the function types and usages supported by Go language

As a fast and efficient programming language, Go language has rich features and powerful functions. Among them, functions have a special status in the Go language as first-class citizens, and the supported function types and usages are also one of its unique highlights. This article will explore the function types and usage supported by the Go language and analyze it through specific code examples.

Function type

In the Go language, a function is also a type that can be passed as a parameter to other functions, assigned to a variable, and used as the return value of a function. The following are several common function types:

1. Common function type:

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

2. Function type variable:

type Calculate func(int, int) int

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

func main() {
    var c Calculate
    c = add // 将add函数赋值给c
    result := c(10, 20) // 调用c函数变量
    fmt.Println(result)
}

3. Anonymous function type:

func main() {
    add := func(a, b int) int {
        return a + b
    }
    result := add(10, 20)
    fmt.Println(result)
}

Function usage

In addition to supporting function types, Go language also provides some special function usage, such as anonymous functions, closure functions, etc. Here are some common usage examples:

1. Anonymous function:

func main() {
    add := func(a, b int) int { // 定义匿名函数
        return a + b
    }
    result := add(10, 20) // 调用匿名函数
    fmt.Println(result)
}

2. Closure function:

func add(a int) func(int) int { // 定义闭包函数
    return func(b int) int {
        return a + b
    }
}

func main() {
    result := add(10)(20) // 调用闭包函数
    fmt.Println(result)
}

3. Function as parameter:

func compute(a, b int, op func(int, int) int) int { // 函数作为参数
    return op(a, b)
}

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

func main() {
    result := compute(10, 20, add) // 调用函数作为参数
    fmt.Println(result)
}

Through the above code examples, we can see that Go language has flexible support for function types and usage, which makes functions have more possibilities and application scenarios in Go language. . Developers can choose appropriate function types and usage methods based on actual needs to improve code readability and maintainability. I hope this article will inspire and help readers about the function types and usage of Go language.

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