yew

Generator based flow-control

Caution

Since generators is a new feature in JavaScript ES6, so you need:

Node version: ~0.11.x

Then run with node --harmony-generators flag

Installation

$ npm install yew --save

Usage

Async way:

var request = require('request');

request({
    url: 'https://graph.facebook.com/GitHub',
    method: 'GET',
    json: true
}, function(err, res, body) {
    console.log(body);
});

Yew way: (Sync way :smiley:)

var yew     = require('yew');
var request = require('request');

yew(function *() {
    var data = yield [request, {
        url: 'https://graph.facebook.com/GitHub',
        method: 'GET',
        json: true
    }];

    console.log(data[0]); //err
    console.log(data[1]); //res
    console.log(data[2]); //body
});

How to use

• yield an array
• Array format: [function, argument1 [, argument2, ...]]
• No need callback function in array
• Callback of function must be the last argument

Return

request('https://graph.facebook.com/GitHub', function(err, res, body) {
})

var data = yield [request, 'https://graph.facebook.com/GitHub'];

/*
data = [
    0: err,
    1: res,
    2: body
]
*/

Example

var yew     = require('yew');
var request = require('request');

yew(function *() {
    var facebook = yield [request, 'https://graph.facebook.com/facebook'];

    var tj       = yield [request.get, 'https://graph.facebook.com/tjholowaychuk'];

    var github   = yield [request, {
        url: 'https://graph.facebook.com/GitHub',
        json: true
    }];

    console.log(facebook[2]);
    console.log(tj[2]);
    console.log(github[2]);
});

Todo

• Error handler