i and j are index values. You need to use them to get to the elements inside the arrays. Them multiply the elements (not the indexes). Look at the example code on how to access the elements. for (let i = 0; i < arr.length; i++) { for (let j = 0; j < arr[i].length; j++) { console.log(arr[i][j…

This is what nesting does, for each iteration of the outer loop, the inner one loops until the breaking condition is met. for (let i = 0; i < arr.length; i++) { for (let j = 0; j < arr[i].length; j++) { console.log(i, j); } } i.e. Outer loop - i == 0, inner loop will run from j == 0 to j < …

Let’s add some printouts: for (let i = 0; i < arr.length; i++) { console.log('i', i); console.log(`arr[${i}]`, arr[i]); for (let j = 0; j < arr[i].length; j++) { console.log(' j', j) console.log(` arr[${i}][${j}]`, arr[i][j]) } } Does this helps?

length instead of lenght :slight_smile: