Return a function from a function in Go (Golang)

In Golang function are first-order variables meaning that

• They can be assigned to a variable

• Passed around as function argument

• Returned from a function

While returning a function from another function, the exact signature of the function has to be specified return list. As in below example

• The return type of getAreaFunc function is func(int, int) int

func getAreaFunc() func(int, int)

• getAreaFunc function hence it can return a function of type func(int, int) int

Code:

package main

import "fmt"

func main() {
    areaF := getAreaFunc()
    res := areaF(2, 4)
    fmt.Println(res)
}

func getAreaFunc() func(int, int) int {
    return func(x, y int) int {
        return x * y
    }
}

Output:

8