Oletem
9/28/2017 - 9:37 PM

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:

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.

Instructions Modify function multiplyAll so that it multiplies the product variable by each number in the sub-arrays of arr

Nesting_for_loops.js
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function multiplyAll(arr) {
  var product = 1;
  // Only change code below this line
  for(var i = 0; i<arr.length; i++){
    
    for(var j = 0; j<arr[i].length; j++){
      
      product*= arr[i][j];
      
    }
  }
  // Only change code above this line
  return product;
}

// Modify values below to test your code
multiplyAll([[1,2],[3,4],[5,6,7]]);