Nesting For Loops exercise error message

Nesting For Loops exercise error message
0

Tell us what’s happening:
I have double checked the code I used for this exercise and in the end I’ve also used the version provided by freeCodeCamp.

I am stacked, I know the code is correct as it works in real.it; but I keep receiving different code error like :
multiplyAll([[1,2],[3,4],[5,6,7]]) should return 5040
multiplyAll([[5,1],[0.2, 4, 0.5],[3, 9]]) should return 54

or

TypeError: unknown: undefined is not an object (evaluating ‘o[a]’)

Your code so far

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[1].length; j++){
      product = product * arr[i][j];
    }
  }
  // Only change code above this line
  return product;
}

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[1].length; j++){
      product = product * arr[i][j];
    }
  }
  // Only change code above this line
  return product;
}

// Modify values below to test your code
multiplyAll([[1],[2],[3]]);
multiplyAll([[1,2],[3,4],[5,6,7]])
multiplyAll([[5,1],[0.2, 4, 0.5],[3, 9]])

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.1.1 Safari/605.1.15.

Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/basic-javascript/nesting-for-loops/

Why are you limiting j to be less than the length of the 2nd element of arr? What if there are 3 elements or 4 elements in arr?

1 Like

what if the inner arrays have different lengths? what if there is not an array at index 1?

Guys I am sorry this arr[1].length was meant to be arr[i].length.

Thank you for your eagle eye :slight_smile: