A small promise lib

gistfile1.js

/// Promise.js

function Promise() {

    this.then = function (handler) {
        this.thenHandler = handler;
        return this;
    };

    this.error = function (handler) {
        this.errorHandler = handler;
        return this;
    };

}

Promise.defer = function () {

    var promise = new Monad();

    return {
        resolve: function (data) {
            if (promise.thenHandler) promise.thenHandler(data);
        },
        reject: function (data) {
            if (promise.errorHandler) promise.errorHandler(data);
        },
        promise: function () {
            return promise;
        }
    }

};

module.exports = Promise;




/// exmaple.js

var Promise = require('./Promise');


function foo() {
    var deferred = Promise.defer();
    setTimeout(function () {
        deferred.resolve('Hoi');
    }, 3000);
    return deferred.promise();
}



function read(path) {
    var deferred = Promise.defer(),
        fs = require('fs');

    fs.readFile(path, function(err, text) {

        deferred.resolve(text.toString());

    });

    return deferred.promise();
}



read('./Promise.js')
    .then(function(_fib) {
        console.log(_fib);
    }).error(function(err) {
        console.log('Something went wrong:', err);
    });


var promise = foo();
promise.then(function(data) {
    console.log(data);
});