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How to check if a value exists in a map in Golang

Gutha Vamsi Krishna

In this shot, we will learn to check if a value exists in a map using Golang.

No built-in function checks if a value exists in a map in Golang.

So, we will use the following approach to check if a value exists in a map:

  • Traverse through the entire map.
  • Check if the present value is equal to the value the user wants to check.
    • If it is equal and is found, print the value.

    • Otherwise, print that the value is not found in the map.


In this example, we will have a dictionary where the student names are the key, and their ages are the value.

We will check whether or not students of a certain age are present.


package main

//program execution starts here
func main(){

  //declare a map
  students := map[string]int{
    "john": 10,
    "james": 12,
  //provide user value 
  var userValue = 10

  //call function and proceed according to return
  if checkForValue(userValue,students){
    //executes if a value is present in the map
    println("Value found")
    //executes if a value is NOT present in the map
    println("Value NOT found in the map")


//function to check if a value present in the map
func checkForValue(userValue int, students map[string]int)bool{

  //traverse through the map
  for _,value:= range students{

    //check if present value is equals to userValue
    if(value == userValue){

      //if same return true
      return true

  //if value not found return false
  return false


  • We declare and initialize a map students, with the key as the student’s name and the value as their age.

  • Line 14: We provide user input.

  • Line 30: We declare the function that accepts the userValue and students as parameters and returns a boolean value.

    • Line 33: We traverse through the map, students, and check if the present value equals the userValue. If it is equal, return true.

    • Line 44: If the userValue is not found in the map after traversing, return false.

  • Line 17: We call the checkForValue function and use an if statement to check if the returned value is true or false. We then display the output accordingly.



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