Changing an array elements in JavaScript

Array elements can be changed:

let arr = ['a', 'b', 'c'];

arr[0] = '!';
console.log(arr); // shows ['!', 'b', 'c']

Create an array with the elements 'a', 'b', 'c'. Write the number 1 instead of the first element, 2 instead of the second, 3 instead of the third.