What is new Set() in javascript?

In JavaScript, Set is a built-in object that allows you to store unique values of any type, whether primitive values or object references. The Set object was introduced in ECMAScript 2015 (ES6) and provides a simple and efficient way to manage a collection of unique values.

Here's a brief explanation of Set:

1. Unique Values:

   • A Set can only contain unique values. If you try to add a duplicate value, it won't be added, and the set will remain unchanged.

2. Creation:

   • You can create a new Set using the new Set() constructor. You can also initialize a Set with an iterable, such as an array.

    const mySet = new Set();
   

   or
   

    const mySet = new Set([1, 2, 3, 4, 5]);
   

3. Adding and Removing Elements:

   • You can add an element to a Set using the add method:

    mySet.add(6);
   

• To remove an element, you can use the delete method:
  

   mySet.delete(3);
  

1. Checking for Existence:

   • You can check if a value exists in a Set using the has method:

    console.log(mySet.has(3)); // Returns false after deleting 3
   

2. Size:

   • The size property returns the number of elements in a Set:

    console.log(mySet.size); // Returns the number of elements
   

3. Iteration:

   • You can iterate through the elements of a Set using methods like forEach or the for...of loop:

    mySet.forEach(value => {
      console.log(value);
    });
   

   or
   

    for (const value of mySet) {
      console.log(value);
    }
   

4. Clearing the Set:

   • The clear method removes all elements from the Set:

    mySet.clear();
   

Set is particularly useful when you need to maintain a collection of unique values without duplicates. It provides a convenient and performant way to handle such scenarios.