coffee1.5.coffee

list = [1, 2, 3, 4, 5]

for item in list
  console.log(item)

for item in list by -1
  console.log(item)

coffee1.5.js

// Generated by CoffeeScript 1.5.0
var item, list, _i, _j, _len;

list = [1, 2, 3, 4, 5];

for (_i = 0, _len = list.length; _i < _len; _i++) {
  item = list[_i];
  console.log(item);
}

for (_j = list.length - 1; _j >= 0; _j += -1) {
  item = list[_j];
  console.log(item);
}