Why this is not working?

function largestOfFour(arr) {

  let res = [];

  for (let i = 0; i < arr.length; i++) {

    let biggestNumer = arr[i][0];

    for (let j = 1; j < arr[i].length; i++) {

      if (arr[i][j] > biggestNumer) {

        biggestNumer = arr[i][j];

      }

    }

    res[i] = biggestNumer;

  }

  return res;

}

can you link to the problem

I’ve edited your post for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.

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Thanks a lot, this is my first time posting here.

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The function Math.max() will return the largest number in a given list so if you spread on array out as such Math.max(...[1,2,3]) it would return 3.

Yeah i know about that but in the solutions they gave us this

function largestOfFour(arr) {
  var results = [];
  for (var n = 0; n < arr.length; n++) {
    var largestNumber = arr[n][0];
    for (var sb = 1; sb < arr[n].length; sb++) {
      if (arr[n][sb] > largestNumber) {
        largestNumber = arr[n][sb];
      }
    }

    results[n] = largestNumber;
  }

  return results;
}

So how is this any different from my solution?

function largestOfFour(arr) {
  return arr.map(e => Math.max(...e));
}

functionally they are the same, but it is more compact

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Your function works well and you may not be familiar with higher level functions yet, but freecodecamp will teach you them

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But that is the problem, my function is not working I am getting an error:
TypeError: Cannot read property ‘length’ of undefined

I don’t know what is wrong with my code

Your increminting has a typo.

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Thank you very much. How did I not see that