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What is Sets in JavaScript | JavaScript Tutorials in Hindi | Interview Question #46

In JavaScript, a Set is a built-in object that allows you to store unique values of any type, whether primitive values or object references. It’s similar to an array, but with some differences:

  1. Uniqueness: Sets only allow unique values. If you try to add a value that already exists in the Set, it will not be added again.
  2. Ordering: Sets maintain the insertion order of elements, which means you can iterate through the elements in the order they were added.
  3. No Duplicate Elements: When you try to add a duplicate element to a Set, it won’t throw an error, but it also won’t add the duplicate element. This property makes Sets useful for tasks where you need to ensure uniqueness.

Here’s a basic example of how you can use a Set in JavaScript:

let mySet = new Set();

mySet.add(1); // Won't be added because it's a duplicate

console.log(mySet); // Output: Set(3) { 1, 2, 3 }

console.log(mySet.has(2)); // Output: true

console.log(mySet); // Output: Set(2) { 1, 3 }

mySet.forEach((value) => {
// Output:
// 1
// 3

Sets can be quite handy for tasks like removing duplicates from an array, checking for the presence of unique values, or even as a more efficient alternative to arrays in some situations.

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