🧵  JavaScript Set object  🧵

It stores the collection of unique values of any type in JavaScript.

 

→  Set Methods

1)  Create a new Set from the Array

let uniqueAlpha = new Set(alphabets);

console.log(uniqueAlpha); // Set { 'a', 'b', 'c', 'd' , 'e', 'f'}

2) Size of the Set

let uniqueAlphaSize = uniqueAlpha.size

console.log(uniqueAlphaSize) // 6

3) Add the element to a Set

uniqueAlpha.add('z');

console.log(uniqueAlpha); // Set { 'a', 'b', 'c', 'd' , 'e', 'f', 'z'}

4) Check if the value is in the Set

let hasA = uniqueAlpha.has('a')

let hasK = uniqueAlpha.has('k')

console.log(hasA) // true

console.log(hasK) // false

5) Remove elemnets from a Set

uniqueAlpha.delete('f');

console.log(uniqueAlpha); // Set {"a", "b", "c", "d", "e","z"}

6) Remove all elements from a Set

uniqueAlpha.clear()

console.log(uniqueAlpha) // Set {} => uniqueAlpha.size = 0

→ Weak Set
It is similar to the set but it contains only objects. It gets automatically garbage collected therefore it does not have size method.

Here is the link to the live code demo:
https://js-tewhlh.stackblitz.io

By  @Vanshsh2701 

Reference:  https://www.javascripttutorial.net/es6/javascript-set/

You can read the unrolled version of this thread here: https://typefully.com/Vanshsh2701/doQxn9z

JavaScript Set Object