numberarray.js

function largestOfFour(arr) {

  var end = []; // so we create an array called end
  for(var a = 0; a < arr.length; a++){ // as we cycle through the sub-arrays that were given to us by arr...
    var maximum = 0; // we create a variable called maximum
    var inner = arr[a]; // we create a variable called inner.. it is equal in value to the selected arr array
    for(var b = 0; b < inner.length; b++){ // as we cycle through the values in the selected array...
      if (inner[b] > maximum) // if there is a higher value than what we have found...
        maximum = inner[b]; // then the higher value that we found is now the highest value
    }
    end.push(maximum); // push the highest number out of the array
  }
  return end; // output the values in the end array out of the largestOfFour function
  
  
  
}

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