Discussion on: 6 Different Ways to Insert Elements to an Array in JavaScript

[Alex Lohr]

One seventh little known way is you can also use Object.assign on an array, even to add items beyond its original length:

let a = [1, 2, 3];
Object.assign(a, { 2: 4, 3: 8 });
console.log(a); // returns [1, 2, 4, 8]