paranymph-sync

Function

    const paranymphSync = (list, callback) => {
        (function loop(list, callback, i, result) {
            list[i]((err, data) => {
                return list[++i] && !err ? loop(list, callback, i, data) : callback(err, data)
            }, result)
        })(list, callback, 0)
    }

Minification

const paranymphSync = (l,c) => (function $(l,c,i,r){l[i]((e,d)=>l[++i]&&!e?$(l,c,i,d):c(e,d),r)})(l,c,0)

Speed test paranymphSync vs async.waterfall in node.js

Requesting findOne to MongoDB

setTimeout test synchronously

paranymphSync([
	callback => setTimeout(() => callback(null, 1), 500),
	(callback, result) => setTimeout(() => callback(500, 'Some error'), 200),
	(callback, result) => setTimeout(() => callback(null, result*2), 50)
], (err, data) => console.log('Callback with error: => ', err, data))

result

Callback with error: => 500 Some error

paranymphSync([
	callback => setTimeout(() => callback(null, 1), 500),
	(callback, result) => setTimeout(() => callback(null, result*2), 200),
	(callback, result) => setTimeout(() => callback(null, result*2), 50)
], (err, data) => console.log('Callback without error: => ', err, data))

result

Callback without error: => null 4

XMLHttpRequest test synchronously

paranymphSync([
    (callback) => {
        //Get time
        const req = new XMLHttpRequest()
        req.onload = () => callback(null, JSON.parse(req.responseText))
        req.onerror = () => callback(true, req.status)
        req.ontimeout = () => callback(true, req.status)
        req.open('GET', 'http://time.jsontest.com/')  
        req.send()
    },
    (callback, result) => {
        //Hash time
        const req = new XMLHttpRequest()
        req.onload = () => callback(null, JSON.parse(req.responseText))
        req.onerror = () => callback(true, req.status)
        req.ontimeout = () => callback(true, req.status)
        req.open('GET', 'http://md5.jsontest.com/?text='+result.time)  
        req.send()
    },
    (callback, result) => {
        //Create value
        const req = new XMLHttpRequest()
        req.onload = () => callback(null, JSON.parse(req.responseText))
        req.onerror = () => callback(true, req.status)
        req.ontimeout = () => callback(true, req.status)
        req.open('GET', ' http://echo.jsontest.com/hashtime/'+result.md5)  
        req.send()
    }
], (err, data) => console.log(err, data))

result

null Object {hashtime: "e75923f1ef2977abf5ebc988a40a188b"}

browser result