Functions in Go Programming

Introduction

In this lab, we will learn about functions in Go. We will see how to define functions, how to pass arguments to them, and how to return values from them.

Skills Graph

Functions

In the given code, we have two functions plus and plusPlus. The plus function takes two integers as arguments and returns their sum. The plusPlus function takes three integers as arguments and returns their sum. Your task is to complete the plusPlus function by adding the third integer to the sum of the first two integers.

• The plus function should take two integers as arguments and return their sum as an integer.
• The plusPlus function should take three integers as arguments and return their sum as an integer.
• The plusPlus function should use the plus function to calculate the sum of the first two integers.

$ go run functions.go
1+2 = 3
1+2+3 = 6

## There are several other features to Go functions. One is
## multiple return values, which we'll look at next.

There is the full code below:

// _Functions_ are central in Go. We'll learn about
// functions with a few different examples.

package main

import "fmt"

// Here's a function that takes two `int`s and returns
// their sum as an `int`.
func plus(a int, b int) int {

	// Go requires explicit returns, i.e. it won't
	// automatically return the value of the last
	// expression.
	return a + b
}

// When you have multiple consecutive parameters of
// the same type, you may omit the type name for the
// like-typed parameters up to the final parameter that
// declares the type.
func plusPlus(a, b, c int) int {
	return a + b + c
}

func main() {

	// Call a function just as you'd expect, with
	// `name(args)`.
	res := plus(1, 2)
	fmt.Println("1+2 =", res)

	res = plusPlus(1, 2, 3)
	fmt.Println("1+2+3 =", res)
}

Summary

In this lab, we learned about functions in Go. We saw how to define functions, how to pass arguments to them, and how to return values from them. We also saw how to use one function inside another function.