JavaScript Map has() Method (original) (raw)
Last Updated : 12 Jul, 2024
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:
- **key: It is the key of the element of the map which has to be searched.
**Return Value:
- The Map.has() method returns a boolean value. It returns true if the element exists in the map else it returns false if the element doesn’t exist.
**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.