JavaScript Set has() Method
Last Updated :
23 Jul, 2025
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The Set.has() method in JavaScript is used to check whether an element with a specified value exists in a Set or not. It returns a boolean value indicating the presence or absence of an element with a specified value in a Set.
Syntax:
mySet.has(value);Parameters:
- value: It is the value of the element that has to be checked if it exists in the Set.
Example 1: In this example, we have used sethas() method.
// Create a new set using Set() constructor
let myset = new Set();
// Append new elements to the
// set using add() method
myset.add(23);
myset.add(12);
// As 23 exists 23, it will return true
console.log(myset.has(23));
Output
true
Example 2: In this example, we have used sethas() method.
// Create a new set using Set() constructor
let myset = new Set();
// Append new elements to the
// set using add() method
myset.add("Chicago");
myset.add("California");
myset.add("London");
// As London exists in the set,
// it will return true
console.log(myset.has("London"));
// As Manchester does not exist in the
// set, it will return false
console.log(myset.has("Manchester"));
Output
true false
Supported Browsers:
- Chrome
- Edge
- Firefox
- Opera
- Safari
