An Introduction to Programming in Go/

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Maps in Go

Maps in Go

This lesson gives an introduction to maps, using the map literals and mutating maps in Go

We'll cover the following...

Introduction

Maps are somewhat similar to what other languages call “dictionaries” or “hashes”.

A map maps​ keys to values. Here we are mapping string keys (actor names) to an integer value (age).

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package main
import "fmt"
func main() {
	celebs := map[string]int{ //mapping strings to integers
		"Nicolas Cage":       50,
		"Selena Gomez":       21,
		"Jude Law":           41,
		"Scarlett Johansson": 29,
	}
	fmt.Printf("%#v", celebs)
}

When not using map literals like above, maps must be created with make (not new) before use. The nil map is ...