How can I add new array elements at the beginning of an array in JavaScript?

I have a need to add or prepend elements at the beginning of an array. For example, if my array looks like below: [23, 45, 12, 67] And the response from my AJAX call is 34, I want the updated array to be like the following: [34, 23, 45, 12, 67] Currently I am planning to do it like this: var newArray = []; newArray.push(response); for (var i = 0; i < theArray.length; i++) { newArray.push(theArray[