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what is set..

set is basically an implemetation of array but is generally have unique values..

when can we use set ?

for example when we want to store username . then we can store it in a set.

real life usage

const mySet = new Set();mySet.add(1);mySet.add(2);mySet.add(3);console.log(mySet.has(4));//how to iterate through a set ?for (let value of mySet) {  console.log(value);}
//how to map through it ?// const array = => value * 2);i did tried but remember son you cannot map through a set in jsfor array to wored but not set.

mySet.size()to check the size.
mySet.delete(3);to delete it : )//just like your ex deleted your number