About Return Largest Numbers in Arrays

JavaScript
1

Can someone help me ?

Why can not return [25, 48, 21, -3]. ?

Tell us what’s happening:

Your code so far


function largestOfFour(arr) {
   var largestNumber = [0,0,0,0];
   for(var arrayIndex = 0; arrayIndex < arr.length; arrayIndex++) {
    for(var subArrayIndex = 0; subArrayIndex < arr[arrayIndex].length; subArrayIndex++) {
       if(arr[arrayIndex][subArrayIndex] > largestNumber[arrayIndex]) {         
          largestNumber[arrayIndex] = arr[arrayIndex][subArrayIndex];
        }
    }
 }
 return largestNumber;
}
largestOfFour([[4, 5, 1, 3], [13, 27, 18, 26], [32, 35, 37, 39], [1000, 1001, 857, 1]]);

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Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/basic-algorithm-scripting/return-largest-numbers-in-arrays

2

It’s because your initial array is [0, 0, 0, 0]. Zero is greater than any negative integer.