"use strict";
const s = [5, 6, 7];
s = [1, 2, 3]; // throws error, trying to assign a const
s[2] = 45; // works just as it would with an array declared with var or let
console.log(s); // returns [5, 6, 45]
it explaines that you can’t just reassing the whole array, but you can change single array elements, via bracket notation
like you learned in the challenge Modify Array Data With Indexes