michael@0: Object.extend = function(destination, source) {
michael@0:     for (var property in source)
michael@0:         destination[property] = source[property];
michael@0: };
michael@0: var Enumerable = {
michael@0:     _each: function(iterator) {
michael@0:         for (var i = 0, length = this.length; i < length; i++)
michael@0:             iterator(this[i]);
michael@0:     },
michael@0:     each: function(iterator, context) {
michael@0:         var index = 0;
michael@0:         this._each(function(value) {
michael@0:             iterator.call(context, value, index++);
michael@0:         });
michael@0:     },
michael@0:     map: function(iterator, context) {
michael@0:         var results = [];
michael@0:         this.each(function(value, index) {
michael@0:             var res = iterator.call(context, value);
michael@0:             results.push(res);
michael@0:         });
michael@0:         return results;
michael@0:     },
michael@0:     invoke: function(method) {
michael@0:         var args = $A(arguments).slice(1);
michael@0:         return this.map(function(value) {
michael@0:             return value[method].apply(value, args);
michael@0:         });
michael@0:     },
michael@0: };
michael@0: Object.extend(Array.prototype, Enumerable);
michael@0: function $A(iterable) {
michael@0:     var length = iterable.length || 0, results = new Array(length);
michael@0:     while (length--) results[length] = iterable[length];
michael@0:     return results;
michael@0: }
michael@0: function g() {
michael@0:     return [1, 2, 3, 4, 5].each(function(part) {
michael@0:         return 0;
michael@0:     });
michael@0: }
michael@0: function f() {
michael@0:     g();
michael@0:     g();
michael@0:     g();
michael@0:     g();
michael@0:     var result = [[2, 1, 3], [6, 5, 4]];    
michael@0:     result = result.invoke('invoke', 'toString', 2);
michael@0:     result[0].join(', ');
michael@0: };
michael@0: f();