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TWiW|1.9.19 #87

This week we take a look at Symbols in JavaScript, practical Test Driven Development, embedded image previews and more!

 

Enjoy 🎉

Faster image loading with embedded image previews
HTML

Faster image loading with embedded image previews

By Christoph Erdmann
Christoph Erdmann discusses the Embedded Image Preview (EIP) technique and how it allows us to load preview images during lazy loading via progressive JPEGs, Ajax and HTTP range requests.
A practical guide to Symbols in JavaScript
JavaScript

A practical guide to Symbols in JavaScript

By Valeri Karpov
JavaScript introduced symbols in ES6 as a way to prevent property name collisions. As an added bonus, symbols also provide a way to simulate private properties in 2015-2019 JavaScript.
Creating an object validator in JS the Test-Driven Development way
Testing

Creating an object validator in JS the Test-Driven Development way

By Nick Scialli
Test-Driven Development (TDD) seems like a great concept, but it’s hard to fully understand and appreciate until you see it in action. In this blog post, Nick Scialli shows us how to build a JavaScript object validator using TDD.
@EmmaWedekind
Tweet

@EmmaWedekind

By Emma Wedekind
Just found out about an awesome VSCode plugin that lets you turn markdown hierarchy into ASCII trees. FINALLY. http://marketplace.visualstudio.com/items?itemName...
How to build an API
Podcast

How to build an API

By SynTax
In this episode, Scott and Wes talk about creating APIs - what's happening behind the scenes and why it's important.
 
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