Sept. 29, 2025, 2:37 a.m.

🏡 "I recommend the freedom that comes from asking: Compared to what?" - Gloria Steinem

rendezvous with cassidoo

Hey friends!

We're going to be waking up this week because September is ending! But until then, let's kick back with some content.

Was this forwarded to you? You can subscribe here!


Web links of the week

The Best CSS Unit Might Be a Combination
JSON is not JSON Across Languages
You may be looking for a useSyncExternalStore
Stop using .reverse().find(): meet findLast()


Something that interested me this week

This week was a fairly offline week of cleaning around our home, potty training my toddler (highly recommend this book if you ever need some tips, it has worked super well for us), and just being with family and friends. My inbox is suffering, BUT it's been good for my brain.

That being said... I did mess around a bit with my mobile writing setup, and it's been really nice! I want to mess with it more when I can.


Sponsor

No sponsor this week (the economy, amirite?), but I'm still grateful you're looking here. Have a good week, check out Ductts, check out PocketCal, and dream of a calmer tomorrow.

I'd appreciate deeply if you share this newsletter with your friends, coworkers, or anyone you think might like it. Or who might hate-read it. Or who might just be bored and want another email in their inbox every week.

<3


Interview question of the week

Last week, I had you identify numbers as abundant, deficient, perfect, or amicable! YOU are the perfect ones, Sergio, Amine, Adam, George, Usman, Andrew, Pedro, Elke, David, Marco, Victor, Gavin, John, Jonathan, Neefertiti, Ten, and Paul!

This week's question:
Given the non-negative integer n , output the value of its hyperfactorial. Don't worry about outputs exceeding your language's integer limit.

Examples:

> hyperfactorial(0)
> 1

> hyperfactorial(2)
> 4
> 
> hyperfactorial(3)
> 108

> hyperfactorial(7)
> 3319766398771200000

(you can submit your answers by replying to this email with a link to your solution, or share on Bluesky, Twitter, LinkedIn, or Mastodon)


Cool things from around the internet

Fat Bear Week is here early, and the bears are fat and playful
Always invite Anna
filofax original (personal size) unboxing, setup & flip-through (video)
OwLab Spring | blu4t | DROP+MiTo Keysterine (video)


Joke

Anyone can make a pun... but only a parent can nurture it until it's fully groan!


That's all for now, folks! Have a great week. Be safe, make good choices, and stay hydrated!

Special thanks to Ezell, Ben, Kinetic Labs, Marta, and Flora for supporting my Patreon and this newsletter!

cassidoo

website | blog | github | bluesky | twitter | patreon | twitch | codepen | mastodon

You just read issue #424 of rendezvous with cassidoo. You can also browse the full archives of this newsletter.

Share on Twitter Share on LinkedIn Share on Hacker News Share on Reddit Share via email
GitHub https://cassidoo.co LinkedIn