Why JS programmers hate Coffee

x.coffee

    colors = (tag.toLowerCase() for tag in node.tags when tag.toLowerCase() in COLORS)

x.js

      colors = (function() {
        var _j, _len1, _ref2, _ref3, _results1;

        _ref2 = node.tags;
        _results1 = [];
        for (_j = 0, _len1 = _ref2.length; _j < _len1; _j++) {
          tag = _ref2[_j];
          if (_ref3 = tag.toLowerCasease(), __indexOf.call(COLORS, _ref3) >= 0) {
            _results1.push(tag.toLowerCase());
          }
        }
        return _results1;
      })();