Last Updated : 11 Jul, 2025
The has() method in JavaScript Map returns a boolean indicating whether a specified element is present in the Map object or not. It returns true if the element is found, otherwise false.
Syntax:mapObj.has(key)Parameters:
Example 1: In this example, a map object "myMap" has been created with a single [key, value] pair, and the Map.has() method is used to check whether an element with the key '0' exists in the map or not.
javascript
// creating a map object
let myMap = new Map();
// Adding [key, value] pair to the map
myMap.set(0, 'geeksforgeeks');
// displaying whether an element with
// the key '0' exists in the map or not
// using Map.has() method
console.log(myMap.has(0));
Output:
true
Example 2: In this example, a map object "myMap" has been created with three [key, value] pairs, and the Map.has() method is used to check whether an element with the key '0' and '3' exists in the map or not.
javascript
// creating a map object
let myMap = new Map();
// Adding [key, value] pair to the map
myMap.set(0, 'geeksforgeeks');
myMap.set(1, 'is an online portal');
myMap.set(2, 'for geeks');
// displaying whether an element with the
// key '0' and '3' exists in
// the map or not using Map.has() method
console.log(myMap.has(0));
console.log(myMap.has(3));
Output:
true
false
We have a complete list of Javascript Map methods, to check those please go through this JavaScript MapComplete Reference article.
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