Challenge: Nesting For Loops
If you have a multi-dimensional array, you can use the same logic as the prior Challenge to loop through both the array and any sub-arrays. Here is an example:
var arr = [
[1,2], [3,4], [5,6]
];
for (var i=0; i < arr.length; i++) {
for (var j=0; j < arr[i].length; j++) {
console.log(arr[i][j]);
}
}
This outputs each sub-element in arr
one at a time. Note that for the inner loop, we are checking the .length
of arr[i]
, since arr[i]
is itself an array.