Javascript Sets

The Set object is an unordered collection of unique values. It allows you to store any type of value, whether it be primitive data types or object references. Unlike arrays, Set does not maintain any particular order, and each value can occur only once within a Set instance.

To create a Set, we simply invoke the Set constructor without any arguments. Here’s an example:

const mySet = new Set();

// Add to the Set
mySet.add(1);
mySet.add('Hello');
mySet.add({ name: 'John', age: 25 });

// Remove from the Set
mySet.delete('Hello');

// Remove all values
mySet.clear();

// Check if it contains a value
mySet.has(1); // returns true
mySet.has('Hello'); // returns false (after deletion)

// Length of the Set
mySet.size;

One of the advantages of the Set object is its iterable nature. You can easily iterate through the values using loops or iterable methods, such as forEach, **filter**, and map. Here’s an example:

mySet.add(1);
mySet.add(2);
mySet.add(3);

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

// Output:
// 1
// 2
// 3

The Set object has various applications in JavaScript. Here are a few common scenarios where it proves beneficial:

With Set, you can effortlessly remove duplicate values from an array by converting it into a Set and then back into an array.

It is efficient to check if a value exists in a Set without the need for additional looping or complex logic.

The Set object can be utilized to implement custom data structures such as stacks, queues, or linked lists.