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jrlarsen

@jrlarsen

Author of React Hooks in Action and Get Programming with JavaScript. Learner of Japanese and teacher of maths, computing and English. Exploring web components for mathematics education.

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05.02.2024
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Latest posts by jrlarsen @jrlarsen

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Web Components Demystified online course | Scott Jehl, Web Designer/Developer A comprehensive, premium course about building dynamic, fast, resilient apps with standard web components.

Want to learn all about web components this week? My 8-hour online course, Web Components Demystified, is on sale for $10 through March 13th. Use the code JUST10

scottjehl.com/learn/webcom...

07.03.2026 12:59 πŸ‘ 63 πŸ” 27 πŸ’¬ 3 πŸ“Œ 6
Two straight lines, one with two angles at a point, the other with three.
Underneath are two empty bar models with 180Β° written in the top bar of each.

Two straight lines, one with two angles at a point, the other with three. Underneath are two empty bar models with 180Β° written in the top bar of each.

I used another #BlankIsBest slide this week to introduce angles on the straight line.

The bar model underneath each diagram really helped some of my Y7's make sense of the problems I made up.

#MathsToday

05.03.2026 16:48 πŸ‘ 24 πŸ” 6 πŸ’¬ 3 πŸ“Œ 0
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Two years ago, I set off on a personal pilgrimage, walking the length of Britain from Lands End to John O’Groats.

The single most transformative experience of my life.

Along the way, I published a blog and daily video of the trip.

markwalks.com

03.03.2026 09:34 πŸ‘ 5 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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Release v1.0.0-alpha.5 Β· wakujs/waku This version introduces a new implementation of Waku Router. While the API remains unchanged, there may be slight differences in behavior. If you notice any issues or unexpected behavior, please re...

Just released Waku ⛩️ v1.0.0-alpha.5!

Waku is a React framework built for React Server Components. Getting closer to v1 and your feedback is important to get there!

github.com/wakujs/waku/...

01.03.2026 04:33 πŸ‘ 49 πŸ” 4 πŸ’¬ 1 πŸ“Œ 0

So - does anyone have a list of good YouTubers for #ALevelMaths and #ALevelFurtherMaths?
I’m trying to collate a list but don’t want to reinvent the wheel…
I know there is @tayyubmajeed.bsky.social and @bicenmaths.bsky.social - who else?
@robeastaway.bsky.social @maths

26.02.2026 14:38 πŸ‘ 3 πŸ” 3 πŸ’¬ 2 πŸ“Œ 0
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JSHeroes 2026 | Community Organized JS Conference JSHeroes is an yearly event organized by the local JS community in Cluj, Romania. Check the latest updates and join us on the 14th and 15th of May 2026

I've been wanting to give an talk about HTML in a JS-focused event for quite some time now, and I'm happy to deliver it @jsheroes.io 🫢🏻

I hope you'll come and join us!

26.02.2026 17:28 πŸ‘ 9 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0
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Season 2 of our podcast "For a Better Web" premieres tomorrow! With guest Patricia Egger head of Security at @proton.me

26.02.2026 13:28 πŸ‘ 13 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0
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a brown and white llama is standing in a grassy field looking at the camera . ALT: a brown and white llama is standing in a grassy field looking at the camera .

Hey @tessmachling.bsky.social @drclairenolan.bsky.social @claireboardman.bsky.social @reblambert.bsky.social @drtobydriver.bsky.social
I've just got a new job in a factory making plastic Draculas.
There are only two of us working there, so I have to make every second count.

25.02.2026 07:17 πŸ‘ 81 πŸ” 13 πŸ’¬ 8 πŸ“Œ 0

That looks so awesome!

24.02.2026 16:51 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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To celebrate the brand new piccalil.li homepage, we're knocking 20% off all courses throughout the rest of February and March.

Use code NEXTLEVEL to save 20% and get some high quality education, written by humans *for* humans.

PPP discounts also available.

piccalil.li/courses

24.02.2026 15:04 πŸ‘ 6 πŸ” 4 πŸ’¬ 0 πŸ“Œ 0

πŸŽ‰ Looking for new work.

15 years front-end dev + Design Systems specialist.

I help folks build, maintain & transform design systems.

I'm also available for focused projects, front-end builds, codebase modernisation.

Short to long term.

Let's chat - stu@alwaystwisted.com

reposts appreciated <3

24.02.2026 09:15 πŸ‘ 65 πŸ” 75 πŸ’¬ 2 πŸ“Œ 2
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Gift a membership for Finite Group on Patreon Bring the world of Finite Group to your friends and family.

Do you know anyone who's interested in maths and might like to watch monthly livestreams of people chatting about interesting maths? You can buy a gift membership to our Finite Group community to give someone livestream access for a number of months of your choice! www.patreon.com/FiniteGroup/...

24.02.2026 10:21 πŸ‘ 3 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0
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Piccalilli - level up your front-end development skills Premium courses, articles, links and newsletters give you a real-world, industry specific education that actually matters and that will far outlive any hype and help you level up your career.

We have a new @piccalil.li homepage!

After lots of research, we determined we were doing a bad job of talking about what we actually do, so this refresh aims to make that *very* clear.

piccalil.li

24.02.2026 09:36 πŸ‘ 73 πŸ” 10 πŸ’¬ 5 πŸ“Œ 1
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sugarcube Design tokens, generated CSS, and optional components. Build front ends on strong, reusable foundations.

Sugarcube is now publicly available!

sugarcube.sh

24.02.2026 03:27 πŸ‘ 48 πŸ” 14 πŸ’¬ 4 πŸ“Œ 1
Daphne Oram – Electronic music pioneer

I was listening to some Daphne Oram just the other day!

www.daphneoram.org

19.02.2026 23:05 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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An in-depth guide to customising lists with CSS Richard Rutter helps you to make sense of list-style, list-item, ::marker, counters(), counter(), @counter-style, symbolic, symbols(), symbols and more to push your HTML and CSS lists to the next level.

Richard Rutter helps you to make sense of list-style, list-item, ::marker, counters(), counter(), @counter-style, symbolic, symbols(), symbols and more to push your HTML and CSS lists to the next level.

piccalil.li/blog/an-in-d...

19.02.2026 12:05 πŸ‘ 25 πŸ” 7 πŸ’¬ 1 πŸ“Œ 2

This may be a long shot, but who do I know who’s familiar with Wix Studio?

19.02.2026 11:01 πŸ‘ 0 πŸ” 2 πŸ’¬ 2 πŸ“Œ 0
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Humble Tech Book Bundle: High Tech Career Playbook Bundle by Manning Level up your tech skills and start a new career as a programmer, data scientist, or CTO with the High Tech Career Playbook Bundle by Manning Publications!

new @humblebundle.com tailored to getting and/or advancing your career in tech.

this time, proceeds go to @feedingamerica.org β€” a nationwide network of food banks.

check it out: hubs.la/Q043JWkt0

19.02.2026 00:05 πŸ‘ 1 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0

How do you think the real answer might deviate from the value calculated via proportional? Why?

18.02.2026 23:24 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

And does having a tag make it easier or harder to catch them? Lots to chew on. Which is great!

18.02.2026 23:21 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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Embroidery

Love this cool JS pattern-making script. [codepen.io]

18.02.2026 22:56 πŸ‘ 19 πŸ” 2 πŸ’¬ 1 πŸ“Œ 0

I have lots of questions about the types of fish she has and how and when she captures and recaptures them. And whether the local heron likes or loathes tags.

18.02.2026 23:09 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

⚠️ State of React survey results are live! I just went through the results, and there’s *a ton* of interesting stuff in here.

Sharing my highlights in this thread. 🧡

18.02.2026 22:13 πŸ‘ 60 πŸ” 8 πŸ’¬ 3 πŸ“Œ 2

I reckon I’m a shoe-in once they see how continvouclous my morgs can be!

17.02.2026 12:54 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

I’ve just seen a job post requiring at least five years of morging experience!

17.02.2026 12:49 πŸ‘ 4 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Boyfriend in bed meme:

"I bet he's thinking about continvoucly morging"

"I could be continvoucly morging rn"

Boyfriend in bed meme: "I bet he's thinking about continvoucly morging" "I could be continvoucly morging rn"

And she'd be right

17.02.2026 12:01 πŸ‘ 230 πŸ” 29 πŸ’¬ 3 πŸ“Œ 1

Journal: Magic


Knock, knock! Who’s there? Control freak (now you say β€œcontrol freak who?”)


πŸ”—https://adactio.com/journal/22399

17.02.2026 10:06 πŸ‘ 10 πŸ” 4 πŸ’¬ 2 πŸ“Œ 1

Need a north east MathsConf - have a word with them or me!

12.10.2025 06:13 πŸ‘ 3 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0
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In graph theory, there are algorithms that find the shortest path between two nodes. I made one with pure CSS (including the graph drawing).

Drag the nodes, and the shortest path will update in real-time!

css-tip.com/graph-theory/

A fun demo powered by all the modern & cool CSS features 🀩

16.02.2026 15:30 πŸ‘ 122 πŸ” 23 πŸ’¬ 9 πŸ“Œ 5

I’m slightly worried that this is an easy mistake to spot (although it wasn’t spotted) and there could be many more less obvious mistakes emerging.

17.02.2026 06:16 πŸ‘ 13 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0