Mastering Go - Second Edition

Functions that accept other functions as parameters

Go functions can accept other Go functions as parameters, which is a feature that adds versatility to what you can do with a Go function. The two most common uses of this functionality are functions for sorting elements and the filepath.Walk() function. However, in the example presented here, which is named funFun.go, we will implement a much simpler case that deals with integer values. The relevant code will be presented in three parts.

The first code segment of funFun.go is shown in the following Go code:

package main 
 
import "fmt" 
 
func function1(i int) int { 
    return i + i 
} 
 
func function2(i int) int { 
    return i * i 
} 

What we have here is two functions that both accept an int and return ...