add an item to the beginning of an array

1var colors = ["white","blue"];
2colors.unshift("red"); //add red to beginning of colors
3// colors = ["red","white","blue"]

1// Use unshift method if you don't mind mutating issue
2// If you want to avoid mutating issue
3const array = [3, 2, 1]
4
5const newFirstElement = 4
6
7const newArray = [newFirstElement].concat(array) // [ 4, 3, 2, 1 ]
8
9console.log(newArray);
10

1let newLength = fruits.unshift('Strawberry') // add to the front
2// ["Strawberry", "Banana"]
3