He visto por ahí esta librería de JavaScript y lo comparto con todos.
http://underscorejs.org/
Ejemplo de esta librería:
_.each([1, 2, 3], function(num, i) {
equal(num, i + 1, 'each iterators provide value and iteration count');
});
var answers = [];
_.each([1, 2, 3], function(num){ answers.push(num * this.multiplier);}, {multiplier : 5});
equal(answers.join(', '), '5, 10, 15', 'context object property accessed');
answers = [];
_.forEach([1, 2, 3], function(num){ answers.push(num); });
equal(answers.join(', '), '1, 2, 3', 'aliased as "forEach"');
answers = [];
var obj = {one : 1, two : 2, three : 3};
obj.constructor.prototype.four = 4;
_.each(obj, function(value, key){ answers.push(key); });
equal(answers.join(", "), 'one, two, three', 'iterating over objects works, and ignores the object prototype.');
delete obj.constructor.prototype.four;
var answer = null;
_.each([1, 2, 3], function(num, index, arr){ if (_.include(arr, num)) answer = true; });
ok(answer, 'can reference the original collection from inside the iterator');
answers = 0;
_.each(null, function(){ ++answers; });
equal(answers, 0, 'handles a null properly');
Recursos: