Implicit for loops return values

implicit-return.coffee

sum = ->
  sum = 0
  for i in [1..5]
    sum += i

sum.js

sum = function() {
  var i, _i, _results;
  sum = 0;
  _results = [];
  for (i = _i = 1; _i <= 5; i = ++_i) {
    _results.push(sum += i);
  }
  return _results;
};