Converting Sets to arrays

Sometimes you may need to convert a Set to an array, for example to be able to use Array.prototype methods like .filter(). In order to do so, use Array.from() or destructuring-assignment:

var mySet = new Set([1, 2, 3, 4]);
//use Array.from
const myArray = Array.from(mySet);
//use destructuring-assignment
const myArray = [...mySet];

Now you can filter the array to contain only even numbers and convert it back to Set using Set constructor:

mySet = new Set(myArray.filter(x => x % 2 === 0));

mySet now contains only even numbers:

console.log(mySet); // Set {2, 4}