How to understand higher-order functions of function types in Golang?

Golang higher-order functions accept and return functions. They fall into two categories: receiving functions as parameters: processing other functions or executing dynamic programs. Return functions as return values: Create and return functions that can be stored and later executed.

Understanding Golang higher-order functions

A higher-order function in Golang is a function that accepts and returns functions as parameters or returns value function. This provides strong potential for code reusability, abstraction, and maintainability.

Types of higher-order functions

There are two main types of higher-order functions in Golang:

• Accept functions as Parameters: These functions handle other functions as input, allowing dynamic execution.
• Return functions as return values: These functions create and return functions that can be stored and used for later execution.

Practical case

Accepting functions as parameters

func mapFunc(fn func(int) int, nums []int) []int {
    result := make([]int, len(nums))
    for i, num := range nums {
        result[i] = fn(num)
    }
    return result
}

func main() {
    nums := []int{1, 2, 3, 4, 5}
    squaredNums := mapFunc(func(num int) int {
        return num * num
    }, nums)
    fmt.Println(squaredNums) // 输出： [1 4 9 16 25]
}

Here, mapFunc Accepts a function fn as argument and applies it to each element. fn Square each element and return a new array.

Return function as return value

func genAdder(x int) func(int) int {
    return func(y int) int {
        return x + y
    }
}

func main() {
    add5 := genAdder(5)
    result := add5(10)
    fmt.Println(result) // 输出：15
}

In this example, genAdder returns a closure function that can be captured and used External variable x. add5 The function is called, taking 10 as a parameter and returning 15.

The above is the detailed content of How to understand higher-order functions of function types in Golang?. For more information, please follow other related articles on the PHP Chinese website!