Basic JavaScript - Nesting For Loops

JavaScript
1

Hi!

I need help to understand why I have an error on my code, please.

I cannot figure out why I have this error message: “TypeError: Cannot read properties of undefined (reading ‘length’)”.

Thanks!!

Your code so far

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

multiplyAll([[1, 2], [3, 4], [5, 6, 7]]);

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User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36

Challenge: Basic JavaScript - Nesting For Loops

Link to the challenge:

2

You are using the function name here (and elsewhere), but you should be using the array which is passed to the function instead.

1 Like
3

Your first line function multiplyAll(arr) shows that multiplyAll is a function and you are going to use an argument called arr.

Given the above, have another look at your code and see if you can spot the errors

1 Like
4

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