javascript push item to beginning of array

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

1let arr = [4, 5, 6]
2
3arr.unshift(1, 2, 3)
4console.log(arr);
5// [1, 2, 3, 4, 5, 6]
6

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