Migrating to promises about instagram-node HOT 6 OPEN

var promisedAPI = {};

Object.keys(api).forEach(function (key) {
    promisedAPI[key] = function () {
        var context = this,
            args = Array.prototype.slice.call(arguments);

        return new Promise(function (fulfill, reject) {
            args.push(function (err) {
                if (err) {
                    reject(err);
                } else {
                    Array.prototype.shift.call(arguments);
                    fulfill.apply(null, arguments);
                }
            });

            api[key].apply(null, args);
        });
    }
});

// Sample usage based on the demo express app from README file
app.get('/', function (req, res) {
    // BEFORE:
    // api.user_media_recent('30739527', function (err, result) {
    //     res.send(JSON.stringify(result));
    // });

    // AFTER:
    promisedAPI.user_media_recent('30739527').then(JSON.stringify).then(res.send.bind(res));
});