Advanced Techniques in Go Programming/

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Functions That Return Other Functions

Functions That Return Other Functions

Let’s learn about functions that can return other functions.

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Apart from accepting functions as arguments, functions can also return anonymous functions, which can be handy when the returned function is not always the same but depends on the function's input or other external parameters.

Coding example

This is illustrated in returnFunction.go:

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package main
import "fmt"
func funRet(i int) func(int) int {
	if i < 0 {
		return func(k int) int {
			k = -k
			return k + k
		}
	}
	return func(k int) int {
		return k * k
	}
}

The signature of funRet() declares that the ...