JavaScript Archives

Web Apps

Never Mix Promises and Callbacks in NodeJS

The moral of the story is, don’t call callbacks from inside promises in NodeJS. They will swallow your exceptions unexpectedly.

Web Apps

GraphQL + Apollo – Part 2: Building a Server

GraphQL Servers are a powerful tool that can be used in virtually any ecosystem. I've been really happy with the Apollo toolchain so far.

Web Apps

GraphQL + Apollo – Part 1: An Introduction

Understanding of GraphQL through the lens of Apollo, a set of JavaScript libraries and tools that allow for simple and extensible GraphQL clients & servers.

Web Apps

Lazy Sequences with ECMAScript 6 Generators

Some of the ways you can implement ECMAScript 6 lazy sequences using generators.

Software Science

Pixels and Palettes: Extracting Color Palettes From Images

Learn three different approaches to extracting color palettes from images, and use the free Palette Maker app to experiment with an image of your own.

Developer Tools

Custom QUnit Assertions

QUnit makes it easy to write custom assertions that improve the legibility of your tests and their reports. Here's how to log an assertion.

Developer Tools

Sharing Web Data with iOS Using WKWebView

How we found an easy way to pass a user's API credentials from a web page to our iOS application to support single-account, multiple-login using WKWebView.

Developer Tools

Take Your Emacs to the Next Level by Writing Custom Packages

How to write an Emacs package with Emacs Lisp, then publish it to MELPA, using the example of a Mocha test runner.

Web Apps

Avoiding “Undefined is Not a Function” with Constants

Constants pair well with JavaScript's powerful object data structure, and they can prevent all kinds of problems, including "Undefined is Not a Function."

Web Apps

Bye-Bye, Sinon – Hello, testdouble

A review of testdouble.js, a new alternative to Sinon as a test mocking library in JavaScript.

Web Apps

JavaScript Promises – How They’ll Work Someday

JavaScript Promises are good, but still carry friction for the developer. Here's how future JavaScript developments will make using Promises better.

Web Apps

JavaScript Promises – How They Break

JavaScript Promises are great, but there's a number of subtle misuses that can break them. We'll walk through some common mistakes and how to avoid them.