How to append something to an array?

Answer 1

I think it's worth mentioning that push can be called with multiple arguments, which will be appended to the array in order. For example:

var arr = ['first'];
arr.push('second', 'third');
console.log(arr);

As a result of this you can use push.apply to append an array to another array like so:

var arr = ['first'];
arr.push('second', 'third');
arr.push.apply(arr, ['forth', 'fifth']);
console.log(arr);

Annotated ES5 has more info on exactly what push and apply do.

2016 update: with spread, you don't need that apply anymore, like:

var arr = ['first'];
arr.push('second', 'third');

arr.push(...['fourth', 'fifth']);
console.log(arr) ;