Could someone help me on this code?

JavaScript
1

Tell us what’s happening:
I checked the solution and see they use " result[n] = largestNumber " to have the array with the largest number from the subarray. I don’t know their way before so I wrote my code as following, but it is not working. could someone help to explain why my code is not working? Thank you very much!

Your code so far


function largestOfFour(arr) {
let maxArray = [];
  for (let j = 0; j < arr[0].length; j++) {
    let maxValue = arr[0][0]; 
    if (arr[0][j] > maxValue) {
      maxValue = arr[0][j];
    }  
    maxArray.push(maxValue);
  }
  for (let j = 0; j < arr[1].length; j++) {
    let maxValue = arr[1][0];
    if (arr[1][j] > maxValue) {
      maxValue = arr[1][j];
    }
    maxArray.push(maxValue);
  }
   for (let j = 0; j < arr[2].length; j++) {
    let maxValue = arr[2][0];
    if (arr[2][j] > maxValue) {
      maxValue = arr[2][j];
    }
    maxArray.push(maxValue);
  }
   for (let j = 0; j < arr[3].length; j++) {
    let maxValue = arr[3][0];
    if (arr[3][j] > maxValue) {
      maxValue = arr[3][j];
    }
    maxArray.push(maxValue);
  }
return maxArray;
}

largestOfFour([[4, 5, 1, 3], [13, 27, 18, 26], [32, 35, 37, 39], [1000, 1001, 857, 1]]);

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Challenge: Return Largest Numbers in Arrays

Link to the challenge:

2

Take a look at where you put your maxArray.push(maxValue) statements. They exist in the “for” loop, so they are pushing max value for every iteration of the loop.
Running a console.log(maxArray) just before your return statement will help you debug this.