How to create a map in Golang

#golang

Last updated on Jun 20, 2021 by Suraj Sharma



In this tutorial, you will learn to create a Map of key-value pairs in Golang using the built-in make function.

To create and initialize a map, we call the make function by passing the map key-value type as the first argument and 0 as the second argument.


Example 1


package main

import "fmt"

func main () {
    simpleMap := make(map[int]string, 0)

    simpleMap[1] = "One"
    simpleMap[2] = "Two"

    // print the complete Map
    fmt.Println(simpleMap) // map[1:One 2:Two]

    // get values from Map using keys
    fmt.Println(simpleMap[1]) // "One"
    fmt.Println(simpleMap[2]) // "Two"
}


Refer to the next example to create a map without using the make function


Example 2


package main

import "fmt"

func main () {
    anotherMap := map[int]string{
        3: "Three",
        4: "Four",
    }
    fmt.Println(anotherMap) // map[3:Three 4:Four]
}


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Suraj Sharma is a Full Stack Software Engineer. He holds a B.Tech degree in Computer Science & Engineering from NIT Rourkela.