Web Reference: Aug 5, 2025 Β· Nesting for loops is crucial in JavaScript, enabling iteration over multi-dimensional data structures or performing complex tasks. It involves placing one loop inside another, where the outer loop executes for each iteration of the inner loop. Nesting For Loops If you have a multi-dimensional array, you can use the same logic as the prior waypoint to loop through both the array and any sub-arrays. Here is an example: const arr = [ [1, 2], [3, 4], [5, 6] ]; for (let i = 0; i < arr.length; i++) { for (let j = 0; j < arr[i].length; j++) { console.log(arr[i][j]); } } In the first example, using var, the variable declared in the loop redeclares the variable outside the loop. In the second example, using let, the variable declared in the loop does not redeclare the variable outside the loop.
YouTube Excerpt: This challenge we learn how to iterate through multi-dimensional arrays in
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