tkbjs63

gistfile1.js

var mammal = function (spec) {
   var that = {};
   that.get_name = function () {
      return spec.name;
   };
   that.says = function () {
      return spec.saying || '';
   };
   return that;
};

var cat = function (spec) {
   spec.saying = spec.saying || 'meow';
   var that = mammal(spec);
   that.purr = function (n) {
      var i, s = '';
      for (i = 0; i < n; i += 1) {
         if (s) {
            s += '-';
         }
         s += 'r';
      }
      return s;
   };
   that.get_name = function () {
      return that.says() + ' ' + spec.name + ' ' + that.says();
   };
   return that;
};


Function.prototype.method = function (name, func) {
   this.prototype[name] = func;
   return this;
};

Object.method('superior', function(name) {
   var that = this,
   method = that[name];
   return function () {
      return method.apply(that, arguments);
   };
} );

var coolcat = function (spec) {
   var that = cat(spec),
      super_get_name = that.superior('get_name');
   that.get_name = function (n) {
      return 'like' + super_get_name() + 'baby';
   };
   return that;
};

var myCat = cat({name: 'Henrietta'});
document.writeln(myCat.get_name());
document.writeln(myCat.purr(2));

var myCoolcat = coolcat({name: 'Bix'});
var name = myCoolcat.get_name();
document.writeln(name);