gistfile1.coffee

list = [1..10]
squares = list.map (num) -> num * num
squares = (num * num for num in list)

// Compiles to...

var list, num, squares;
list = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

squares = list.map(function(num) {
  return num * num;
});

squares = (function() {
  var _i, _len, _results;
  _results = [];
  for (_i = 0, _len = list.length; _i < _len; _i++) {
    num = list[_i];
    _results.push(num * num);
  }
  return _results;
})();