Eloquent JS Ch. 4

gistfile1.js

var range = function(start, end, step){
  var range = [];
  if (step === undefined) { step = 1;} //fuck you JS

  var pushToRange = function(num) {
    range.push(num);
  };

  if (start < end) {
    for (var num = start; num <= end; num += step) {
      pushToRange(num);
    }
  }

  else {
    for (var num = start; num >= end; num += step){
      pushToRange(num);
    }
  }

  return range;
};

var sum = function(rangeOfNumbersToAdd){
  var total = 0;

  for (var i in rangeOfNumbersToAdd) {
    total += rangeOfNumbersToAdd[i];
  }

  return total;
};

console.log(sum([1,2,3]));
console.log(sum(range(1,10)));