Javascript :: Add an item at the start of an Array

 Two options mostly use:

• unshift()
• splice()

Considering splice because it's always used for inserting at any position in the array.

Using unshift:

var myArray = [1, 2];
myArray.unshift(0);
console.log(JSON.stringify(myArray));
//outputs: [0, 1, 2]

Using splice:

var myArray = [1, 2];
var valueToInsert = -1;
var indexToInsert = 0;
var deleteCount = 0;
myArray.splice(indexToInsert, deleteCount, valueToInsert);
console.log(JSON.stringify(myArray));

//outputs: [-1, 1, 2]