Object promisification. Playing with method mixin to build chain of callbacks and flatten. Not real promises yet.

promisify.js

function Promisify(obj) {

  var original = Object.getPrototypeOf(obj);

	var Promise = function Promise() {
		this._chain = [];
	};

	Promise.prototype = Object.create(Promise, {
		constructor : {
			value : original.constructor
		},
		_push : {
			value : function(fn) {
				this._chain.push(fn);
			}
		},
		then : {
			value : function(fn) {
				var cb = this._chain.shift();
				return cb(fn.bind(promise));
			}
		}
	});

	Object.keys(original).forEach(function(key) {
		if(typeof original[key] === "function" && key !== "then") {
			Promise.prototype[key] = function() {
				var args = Array.prototype.slice.call(arguments);

				promise._push(function(fn) {
					args.push(fn);
					obj[key].apply(promise, args);
					return promise;
				});

				return promise;
			};
		}
	});

	var promise = new Promise();

	return promise;
}

usage.js

Promisify(obj)
	.hello("Joe")
	.then(function(message) {
		console.log(message);
		this.hello("Fred");
	})
	.then(function(message) {
		console.log(message);
	})
	.goodbye("Joe")
	.then(function(message) {
		console.log(message);
		this.goodbye("Fred");
	})
	.then(function(message) {
		console.log(message);
		next();
	});
});