Also CoffeeScript sometimes generates very ugly code. Example:

SelectParser.select_to_array = (select) ->
  parser = new SelectParser()
  parser.add_node( child ) for child in select.childNodes

Generated JavaScript:
  SelectParser.select_to_array = function(select) {
    var child, parser, _i, _len, _ref;
    parser = new SelectParser();
    _ref = select.childNodes;
    for (_i = 0, _len = _ref.length; _i < _len; _i++) {
      child = _ref[_i];
    return parser.parsed;

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