Push multiple elements to array
You can push multiple elements into an array in the following way
var a = [];
a.push(1, 2, 3);
console.log(a);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
When using most functions of objects with apply or call, the context parameter MUST be the object you are working on.
In this case, you need a.push.apply(a, [1,2]) (or more correctly Array.prototype.push.apply(a, [1,2]))
You can use Array.concat:
var result = a.concat(b);