Help : Return Largest Numbers in Arrays

JavaScript
6

thanks for your explanation, now i get it. by initializing v with a value of 0 it was gonna see that zero in a subarry with neagtive numbers only. this is my updated code and it’s working

function largestOfFour(arr) {
  // You can do this!
   var largest = [];
   for(var i = 0; i < arr.length; i++){
    var v = arr[i][0];
    for(var j = 0; j < arr[i].length; j++){
      if(arr[i][j] > v){
        v = arr[i][j];
      }
    }
    largest.push(v);
  }
  return largest;
}

console.log(largestOfFour([[17, 23, 25, 12], [25, 7, 34, 48], [4, -10, 18, 21], [-72, -3, -17, -10]]));