Posts tagged with "JavaScript"

Introducing Mentoss: The fetch mocker

A new approach to mocking global fetch() calls that works in both browsers and server-side runtimes.

January 27, 2025• 10 min read

What's the difference between JavaScript engines and JavaScript runtimes?

Runtimes and engines are often incorrectly referred to as the same thing.

March 26, 2024• 5 min read

JavaScript ECMAScript APIs

Introducing humanfs (formerly fsx): A modern filesystem API for JavaScript

Filesystem APIs in JavaScript runtimes haven't been great for a long time. This is my attempt to make a better one.

January 10, 2024• 11 min read

JavaScript Filesystem APIs

JavaScript WTF: Why does every() return true for empty arrays?

How can a condition be satisified when there aren't any values to test?

September 8, 2023• 6 min read

JavaScript WTF

Disabling paste in textboxes is not a security feature

This common, and annoying, pattern on many government and financial websites causes more problems than it solves.

July 3, 2023• 11 min read

HTML Security Accessibility

Automating tweets with Twitter API v2

As Twitter disables many apps that use the v1.1 API, it's time to learn how to automate tweets using v2.

April 18, 2023• 5 min read

Twitter API OAuth

Creating a Jekyll-style blog post URL in Astro

It's not obvious from the examples, but you can emulate Jekyll-style blog post URLs including years and months in Astro.

March 14, 2023• 6 min read

JavaScript Astro Jekyll

Creating a Jekyll-style blog post year archive in Astro

While not included in their default blog template, it is straightforward to create a year-based archive for your posts in Astro.

February 14, 2023• 4 min read

JavaScript Astro Jekyll

The lazy-loading property pattern in JavaScript

You can defer computationally-expensive operations until needed using an accessor property.

April 20, 2021• 6 min read

JavaScript Design Patterns

Introducing Env: a better way to read environment variables in JavaScript

Reading environment variables in JavaScript is fraught with peril. Env makes it better.

February 16, 2021• 6 min read

JavaScript Environment Variables Node.js

Creating a JavaScript promise from scratch, Part 7: Unhandled rejection tracking

Rejected promises without rejection handlers can hide important errors, which is why both Node.js and browsers have a way of tracking them.

January 19, 2021• 19 min read

JavaScript Promises ECMAScript 6

Creating a JavaScript promise from scratch, Part 6: Promise.all() and Promise.allSettled()

Promise.all() and Promise.allSettled() work on any number of promises to allow you to know when all of the promises have resolved

December 16, 2020• 11 min read

JavaScript Promises ECMAScript 6

Creating a JavaScript promise from scratch, Part 5: Promise.race() and Promise.any()

Promise.race() and Promise.any() work on any number of promises to allow you to know when certain ones have resolved

November 24, 2020• 19 min read

JavaScript Promises ECMAScript 6

Creating a JavaScript promise from scratch, Part 4: Promise.resolve() and Promise.reject()

Promises created with Promise.resolve() and Promise.reject() go through a different process than when created with a constructor.

October 13, 2020• 8 min read

JavaScript Promises ECMAScript 6

Creating a JavaScript promise from scratch, Part 3: then(), catch(), and finally()

Promise handlers are where all of the asynchronous actions happens and it helps to look at the internals to understand how they work.

October 6, 2020• 22 min read

JavaScript Promises ECMAScript 6

Creating a JavaScript promise from scratch, Part 2: Resolving to a promise

Resolving promises to non-thenables is easy; resolving promises to other promises requires a bit of work.

September 29, 2020• 7 min read

JavaScript Promises ECMAScript 6

Creating a JavaScript promise from scratch, Part 1: Constructor

Sometimes it's easier to understand complex concepts like promises by creating them yourself.

September 22, 2020• 14 min read

JavaScript Promises ECMAScript 6

Computer science in JavaScript: Circular Doubly-linked lists

Expanding on a doubly linked list by adding circular traversal.

March 5, 2019• 14 min read

Computer Science Data Structures JavaScript

Computer science in JavaScript: Doubly linked lists

Implementing a doubly linked list in JavaScript.

February 5, 2019• 11 min read

Computer Science Data Structures JavaScript

Why I've stopped exporting defaults from my JavaScript modules

After years of fighting with default exports, I've changed my ways.

January 15, 2019• 11 min read

JavaScript Modules CommonJS

Computer science in JavaScript: Linked list

Building the classic computer science data structure in JavaScript.

January 8, 2019• 15 min read

Computer Science JavaScript Linked List

Extracting command line arguments from Node.js using destructuring

Using array destructuring to easily handle command line arguments.

October 2, 2018• 2 min read

JavaScript Destructuring Node.js

Detecting new posts with Jekyll and Netlify

Use Node.js to tell when a new Jekyll blog post is published.

September 4, 2018• 5 min read

JavaScript Jekyll Netlify

The inception of ESLint

The story of how one bug at work spawned the pluggable linter.

February 27, 2018• 6 min read

JavaScript ESLint ECMAScript

The ECMAScript 2016 change you probably don't know

How the JavaScript strict mode directive changed in 2016.

October 18, 2016• 7 min read

JavaScript ECMAScript 2016 Strict Mode

ES6 module loading: More complicated than you think

Module JavaScript can be indistinguishable from non-module JavaScript.

April 5, 2016• 7 min read

JavaScript ECMAScript 6 Modules

Mimicking npm script in Node.js

Run command line tools with specific environment settings.

March 8, 2016• 4 min read

JavaScript Node.js npm

Reflections on ESLint's success

The little linter that could has grown up before my eyes.

February 9, 2016• 13 min read

JavaScript ESLint JSHint

Classes ECMAScript 6 JavaScript