8.3.1. Common Array Methods // unshift Examples
//The general syntax for this method is:
arrayName.unshift(item1, item2, ...)
/*This method adds one or more items to the START of an array and returns
the new length.*/
//The new items may be of any data type.
let arr = ['a', 'b', 'c'];
arr.unshift('hello', 121);
console.log(arr);
//5
//['hello', 121, 'a', 'b', 'c']