How to add an element into an array from differernt orders in Javascript?

Question

The is an array, and I wanna add an element at the beginning and the end of the array.

Answer

So the array is

var array = [2, 3, 4];

The new element is var newBeginning = 1;, and var newEnd = 5;.

To the beginning

If we wanna at to the beginning, we can use unshift function.

array.unshift(newBeginning);   // [1, 2, 3, 4]

To the end

If we wanna at to the end, we can use push function.

array.unshift(newEnd);   // [2, 3, 4, 5]

Reference

• Javascript - Wait 5 seconds before executing next line

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