Introduction

Functions are a core part of many languages and Go is no exception. A function is a section of code that has been declared to perform a task. Go functions can have zero or more inputs and outputs. One feature that sets Go apart from other programming languages is the multiple return values; most programming languages are limited to one return value.

In the following section, we will see some features of Go functions that differ from other languages, such as returning multiple types. We will also see that Go has support for first-class functions. This means that Go has the ability to assign a variable to a function, pass a function as an argument, and have a function as a return type for a function. We will show how functions can be used to break up complex parts into smaller parts.

Functions in Go are considered first-class citizens and higher-order functions. First-class citizens are the functions that are assigned to a variable. Higher-order functions are functions...