Question

Is there a built in way to append one list into another like so:

var a = [1,2,3];
a.append([4,5]);
// now a is [1,2,3,4,5];

concat() does something similar but returns the result. I want something that modifies the existing list like push()

Answer 1

push will work, but you also need to use apply.

var a = [1,2,3];
a.push.apply(a, [4,5])