Write Your Own Node.js Promise Library from Scratch

Promises are the preferred async primitive in JavaScript. Callbacks are becoming increasingly uncommon, especially now that async/await is available in Node.js. Async/await is based on promises, so you need to understand promises to master async/await. In this article, I’ll walk you through writing your own promise library and demonstrate using it with async/await.

http://thecodebarbarian.com/write-your-own-node-js-promise-library-from-scratch.html

An easy guide to object rest/spread properties in JavaScript

Merging multiple JavaScript objects is a frequent task. Unfortunately JavaScript is sloppy at providing a convenient syntax to do the merge. At least until now.

In ES5 your solution is _.extend(target, [sources]) from Lodash (or any alternative), and ES2015 introduces Object.assign(target, [sources]).

Luckily object spread syntax (an ECMASript proposal at stage 3) is a step forward how to manipulate objects, providing a short and easy to follow syntax.

https://dmitripavlutin.com/object-rest-spread-properties-javascript/

AWS Lambda Node.js 8 support: what it changes for serverless developers

Node.js 8.10 runtime now available in AWS Lambda

The Lambda programming model for Node.js 8.10 now supports defining a function handler using the async/await pattern.

Asynchronous or non-blocking calls are an inherent and important part of applications, as user and human interfaces are asynchronous by nature. If you decide to have a coffee with a friend, you usually order the coffee then start or continue a conversation with your friend while the coffee is getting ready. You don’t wait for the coffee to be ready before you start talking. These activities are asynchronous, because you can start one and then move to the next without waiting for completion. Otherwise, you’d delay (or block) the start of the next activity.

Asynchronous calls used to be handled in Node.js using callbacks. That presented problems when they were nested within other callbacks in multiple levels, making the code difficult to maintain and understand.

Promises were implemented to try to solve issues caused by “callback hell.” They allow asynchronous operations to call their own methods and handle what happens when a call is successful or when it fails. As your requirements become more complicated, even promises become harder to work with and may still end up complicating your code.

Async/await is the new way of handling asynchronous operations in Node.js, and makes for simpler, easier, and cleaner code for non-blocking calls. It still uses promises but a callback is returned directly from the asynchronous function, just as if it were a synchronous blocking function.

https://aws.amazon.com/pt/blogs/compute/node-js-8-10-runtime-now-available-in-aws-lambda/


Node 8 support for AWS Lambda is here!

If you’re a serverless developer on Lambda, read on for what you need to know about Node 8. Namely: speed, Async/Await, object rest and spread, and NPX.

https://serverless.com/blog/aws-lambda-node-8-support-what-changes-serverless-developers/

Using React, Firebase, and Ant Design to Quickly Prototype Web Applications

In this guide I will show you how to use Firebase, React, and Ant Design as building blocks to build functional, high-fidelity web applications. To illustrate this, we’ll go through an example of building a todo list app.

These days, there are so many tools available for web development that it can feel paralyzing. Which server should you use? What front-end framework are you going to choose? Usually, the recommended approach is to use the technologies that you know best. Generally, this means choosing a battle-tested database like PostgreSQL or MySQL, choosing a MVC framework for your webserver (my favourite is Adonis), and either using that framework’s rendering engine or using a client-side javascript library like ReactJS or AngularJS.

Using the above approach is productive – especially if you have good boilerplate to get you started – but what if you want to build something quickly with nearly zero setup time? Sometimes a mockup doesn’t convey enough information to a client; sometimes you want to build out an MVP super fast for a new product.

The source code for this example is available here. If you’re looking for a good IDE to use during this guide, I highly recommend Visual Studio Code.

https://nrempel.com/guides/react-firebase-ant-design/

17 JavaScript / node.js performance coding tips to make applications faster

Though JavaScript has the highest number of developers in its community with respect to any other language on earth at this moment; there are a lot of misconceptions, shallow knowledge, bad assumptions among the community members.
In this article we have come up with a list of tips, which can make your javascript application faster.

This article is not about dev-ops and doesn’t discuss on things like minify your files or setup redis or use docker and kubernetes to make your application performant. This article is about coding in JavaScript to make the performance better.

http://voidcanvas.com/javascript-performant-coding-tips/