Posts tagged with javascript

• Dynamically enable and disable map scroll wheel zoom with Leaflet.js

  This post was published on February 7, 2026

  Learn how to programmatically require the presence of a modifier key to enable scroll wheel zoom support in Leaflet maps.

• Code Reviewing AI-Generated JavaScript: What I Found

  This post was published on January 19, 2026

  What I learned reviewing AI-generated JavaScript: real-world issues, code review tips, and ways to ensure robust, production-ready code.

• Flexsearch tokenizers - Learning through writing tests

  This post was published on July 1, 2022

  An introduction to Flexsearch and its tokenizers through writing and interpreting tests.

• How Playwright Can Help You Write Better Tests by Separating Test and Production Data

  This post was published on July 1, 2022

  When running your Playwright tests, how do you load a different set of data based on the current execution environment?

• Number and Currency Formatting in JavaScript using Intl.NumberFormat

  This post was published on April 4, 2024

  While this post does not by any means aim to cover all the amazing things you can do with Intl.NumberFormat, I do cover two very common use cases you may have faced when formatting numbers in JavaScript.

• Cancelling asynchronous operations with AbortController

  This post was published on July 1, 2022

  How to cancel asynchronous operations with the AbortController API.

• Progressive Web Apps (PWA) in 2021

  This post was published on July 1, 2021

  Some thoughts on the current state and challenges with regards to building a PWA in 2021.

• Reconsidering double equals in JavaScript

  This post was published on January 1, 2022

  Could it be that the == operator in JavaScript had a bad rap and it’s time to reconsider it?

• Safely Selecting Elements with Special Characters Using CSS.escape()

  This post was published on February 10, 2026

  Learn how to safely select DOM elements with special characters in their IDs or classes using CSS.escape() to avoid selector parsing errors.

• Styling the CodeMirror 5 cursor for light and dark modes

  This post was published on April 1, 2022

  How do you style the cursor in CodeMirror 5? Also, how can you do this for light and dark themes? Let's take a look.

• Switching from babel-eslint to @babel-eslint

  This post was published on June 1, 2022

  There are a couple of steps to take when switching from the older babel-eslint to the newer @babel-eslint. No worries, I'll show you how.

• Using TypeScript Triple-Slash Directives with JSDoc

  This post was published on February 5, 2026

  How to use TypeScript’s triple-slash reference directives to load type definitions when type-checking JavaScript with JSDoc.

• Type Safety and Runtime Validation in JavaScript with Zod and JSDoc

  This post was published on January 26, 2026

  Combining Zod's runtime validation with JSDoc's type annotations to achieve type safety in JavaScript without TypeScript.

• Using EventEmitter in Node.js

  This post was published on August 1, 2022

  Using the Nodejs EventEmitter with GitHub webhooks

• Mocking Browser Image Loading in Vitest: Property Descriptors, Prototypes, and WeakMap

  This post was published on February 20, 2026

  A deep dive into the JavaScript concepts behind mocking HTMLImageElement behaviour in Vitest, including Object.defineProperty, Object.getOwnPropertyDescriptor, prototype manipulation, and WeakMap for per-instance state tracking.