Nesting For Loops(0)

Tell us what’s happening:
I’m trying to solve a problem where you multiply all elements of a 2 dimensional array together using nested for loops. The code I have written so far won’t correctly compute the product, though it appears to me that it should. What is wrong with the code I have written?

Your code so far

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

// Modify values below to test your code

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Link to the challenge:

You have off-by-one errors. Your loop conditions should not subtract 1 from the length, or the last numbers won’t be multiplied.