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This article has been given a more permanent home on my blog. Also, since it was first written, the development of the Promises/A+ specification has made the original emphasis on Promises/A seem somewhat outdated.

You're Missing the Point of Promises

Promises are a software abstraction that makes working with asynchronous operations much more pleasant. In the most basic definition, your code will move from continuation-passing style:

getTweetsFor("domenic", function (err, results) {
 // the rest of your code goes here.

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console.log("%c      ","font-size:50px;background-image:url(http://goo.gl/uMbhMT); background-size:contain; background-repeat:no-repeat;")

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The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

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*Handling performance for Progressive Web Apps at scale: Flipkart
PRPL
<link rel="preload">
https://developers.google.com/web/updates/2016/03/link-rel-preload?hl=en
requestAnimationFrame(function(){
performance.mark('first paint')});
https://developers.google.com/web/fundamentals/performance/critical-rendering-path/analyzing-crp?hl=en

First slide: tiny.cc/nxtgen

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function decimalAdjust(value)
{
   value = value.toString().split('e');
	 value = Math.round(+(value[0] + 'e' + (value[1] ? (+value[1] + 2) : 2)));
   value = value.toString().split('e');
   return +(value[0] + 'e' + (value[1] ? (+value[1] - 2) : -2));
}

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upstream websocket {
    server localhost:3000;
}

server {
    listen       80;
    server_name  localhost;

    access_log  /var/log/nginx/websocket.access.log  main;

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In this article I will take a very simplistic approach in understanding memory leaks and I will also attempt to diagnose them.

In todays world of abundant memory, we seldom worry about memory leakages. But I hate to tell you that we live in a real world and nothing comes for free.

Oh my fancy functional programming

Disclosure: I absolutely love functional programming. Functional programming is cool and with the new ES6 syntax it becomes even cooler.

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Array<T>

Legend:

• ✏️ method changes this.
• 🔒 method does not change this.

Array<T>.prototype.*:

• concat(...items: Array: T[] 🔒 ^ES3

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// Simple gist to test parallel promise resolution when using async / await

function promiseWait(time) {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
        resolve(true);
    }, time);
});
}

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https://www.hackerrank.com/challenges/birthday-cake-candles/problem
https://www.hackerrank.com/challenges/compare-the-triplets/problem
https://www.hackerrank.com/challenges/queens-attack-2/problem
https://www.hackerrank.com/challenges/bigger-is-greater/problem