JS ALgorithms - Return an array consisting of the largest number from each provided sub-array

JavaScript
1

Tell us what’s happening:
Hey, I am not accounting for a subarray with all negative numbers. I am not sure of how to implement that into this algorithm. Please help me! Thank you : )

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]]);

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.121 Safari/537.36.

Challenge: Return Largest Numbers in Arrays

Link to the challenge:

2

Use -Infinity instead of 0

3

Thank you !!! :grinning:

4

it worked @jenovs. Thank you for your help!