http://www.freecodecamp.com/kkas 's solution for Bonfire: Return Largest Numbers in Arrays

bonfire-return-largest-numbers-in-arrays#.js

// Bonfire: Return Largest Numbers in Arrays
// Author: @kkas
// Challenge: http://www.freecodecamp.com/challenges/bonfire-return-largest-numbers-in-arrays#
// Learn to Code at Free Code Camp (www.freecodecamp.com)

function largestOfFour(arr) {
  // You can do this!
  return arr.map(function(elemAry) {
    return elemAry.sort(function(a, b) { return a - b;})[elemAry.length - 1];
  });
}

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