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)); |
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" ));
|
true false
We have a complete list of Javascript Set methods, to check those please go through this Sets in JavaScript article.
We have a Cheat Sheet on Javascript where we covered all the important topics of Javascript to check those please go through Javascript Cheat Sheet-A Basic guide to JavaScript.