fcc_sum_all_numbers_in_a_range_ugly.js

function sumAll(arr) {
  var min = Math.min.apply(null, arr),
      max = Math.max.apply(null, arr),
      newArr = [],
      i;
  for (i = min; i <= max; i++) {
    newArr.push(i);
  }
  return newArr.reduce(function (a,b) {
    return a+b;
  });
}

sumAll([10, 5]);