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Learning About Functions

Learning About Functions

Learn about functions in Go, including variadic arguments and anonymous functions.

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Functions in Go are what we’d expect from a modern programming language. There are only a few things that make Go functions different:

  • Multiple return values are supported

  • Variadic arguments

  • Named return values

The basic function signature is as follows:

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func functionName([varName] [varType], ...) ([return value],[return value], ...) {
}

Let's make a basic function that adds two numbers together and returns the result:

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func add(x int, y int) int {
    return x + y
}

As we can see, this takes in two integers, x and y, adds them together, and returns the result (which is an integer). Let's show how we can call this function and print its output:

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package main
import "fmt"
func add(x int, y int) int {
    return x + y
}
func main() {
    result := add(2, 2)
    fmt.Println(result)
}

We can simplify this function signature by declaring both x and y types with a single int keyword:

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func add(x, y int) int {
    return x + y
}

This is equivalent to the previous one.

Returning multiple values and named results

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