How to use the unshift in javascript?

Question

javascript unshift

Answer 1

https://www.w3schools.com/jsref/jsref_unshift.asp

Answer 2

var arr=[6,5,2];
arr=arr.unshift(3);
alert(arr);
//3,6,5,2
the unshift() method pushes an element into an array's first index
it is the opposite of push() which pushes an element into an array's last index

Answer 3

Hello, Ronalyn Joy Sardañas !
This method changes the original array.
Adds arguments to it and returns the resulting length.

var arrOne = ["a", "b"]

var unshiftedOne = arrOne.unshift(-2, -1);

alert(arr); // [-2, -1, "a", "b"]

alert("New length:" + unshiftedOne); // 4