To check if an element exists in a Set in JavaScript, you can use the has() method. The has() method returns a boolean indicating whether the specified element is present in the Set.
Example: Here, mySet.has(3) returns true because the value 3 is present in the Set. On the other hand, mySet.has(6) returns false because 6 is not present in the Set.
Javascript
let mySet = new Set([1, 2, 3, 4, 5]);
console.log(mySet.has(3)); // Output: true
console.log(mySet.has(6)); // Output: false
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Output
true false