[JavaScript Array push.apply()] Load content to Array without creating array inside array

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Using apply to append an array to another

We can use push to append an element to an array. And, because push accepts a variable number of arguments, we can also push multiple elements at once. But, if we pass an array to push, it will actually add that array as a single element, instead of adding the elements individually, so we end up with an array inside an array. What if that is not what we want? concat does have the behaviour we want in this case, but it does not actually append to the existing array but creates and returns a new array. But we wanted to append to our existing array... So what now? Write a loop? Surely not?

apply to the rescue!var array = ['a', 'b']; var elements = [0, 1, 2]; array.push.apply(array, elements); console.info(array); // ["a", "b", 0, 1, 2]