How to check if a map contains a key in Golang

#golang

Last updated on Jun 28, 2021 by Suraj Sharma



In this tutorial, you will learn how you can check if a given map contains a keyin Golang

Map in Golang contains key value associative pairs, the index expression of a map always returns two values, one is the value associated with the key and another is a bool value, which is true if the key is present in the map, otherwise it is false.


strMap := make(map[string]string)
strMap["1"] = "One"

fmt.Print(strMap["1"]) // prints "One"
fmt.Print(strMap["2"]) // prints ""


Check if a map contains a key in Golang


package main

import "fmt"

func main () {
    strMap := make(map[string]string)
    strMap["1"] = "One"
    if val, isKeyExists := strMap["2"]; isKeyExists {
        fmt.Printf("key exists: value [%s]", val)
    } else {
        fmt.Print("key doesn't exist")
    }
}


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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.