JavaScript

Posts tagged JavaScript

JavaScript objects, methods, regular expressions, guides, hints, tips, and more.

PSA: Cache your prettier writes

If you’re using Prettier in your projects, you might benefit from caching that’s been introduced since version 2.7 (June 2022). Let’s have a look at how it works and how much faster it runs.

- 3 min read

I'm in the 512KB Club

Since February 2025, my website’s now listed on The 512KB Club! This collection of small websites is a showcase of what’s possible when you set out to do a lot, using only a little. Let’s see what that’s all about and why it matters.

- 5 min read

Intl.Segmenter for l10n in JavaScript

Earlier this year, JavaScript Intl.Segmenter gained support in all three major browser engines, meaning it’s achieved Baseline status of “newly available”. Now, your applications can natively retrieve meaningful information from strings in a variety of locales in the latest browsers.

- 6 min read

New JavaScript Set methods

There’s some fresh JavaScript Set features that have just achieved cross-browser support, so let’s have a look at what they can do. Read on if you’re new to Set in JavaScript and you’re curious how to use these new JavaScript methods. I’ll highlight some advantages with basic examples to show why you might reach for these instead of building your own implementations.

- 13 min read

Page Visibility API usage & hints

Checking document visibility gives you insight into how visitors are interacting with your pages and can provide hints about the status of your applications. This post takes a look at what page visibility is, how you can use the Page Visibility API in your websites, and describes pitfalls to avoid if you build features around this functionality.

- 7 min read

JavaScript console methods

Earlier in the year, I wrote about using grep on the MDN Blog for code search under the “developer essential” category. I categorize it this way because I think it will give people unfamiliar with grep a massive productivity boost and exposure to skills like working on the command line and regular expressions. This looks like it’s becoming a series of posts on “essentials” (or what I think are incredibly beneficial skills, at least) for working effectively as a web developer.

- 1 min read

JavaScript regular expressions reference docs

The JavaScript regular expressions (regex) documentation had a big update recently thanks to the efforts of Joshua Chen. Josh did the heavy lifting, and I was glad to give some feedback and reviews to land the changes. There are new, dedicated pages for each JS language feature for regular expressions, with information about the syntax and browser compat data, too.

- 3 min read