Push multiple elements to array

Question

I'm trying to push multiple elements as one array, but getting an error:

> a = [] [] > a.push.apply(null, [1,2]) TypeError: Array.prototype.push called on null or undefined 

I'm trying to do similar stuff that I'd do in ruby, I was thinking that apply is something like *.

>> a = [] => [] >> a.push(*[1,2]) => [1, 2] 

Answer 1

You can push multiple elements into an array in the following way

var a = [];        a.push(1, 2, 3);    console.log(a);

Answer 2

Now in ECMAScript2015 (a.k.a. ES6), you can use the spread operator to append multiple items at once:

var arr = [1];  var newItems = [2, 3];  arr.push(...newItems);  console.log(arr);

See Kangax's ES6 compatibility table to see what browsers are compatible