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Elixir ▷ Max

@mxgrn.com

1.7K followers 100 following 350 posts

Have *you* fallen for #ElixirLang yet? TILs and reflections from my 9 years with Elixir. Cranking out Elixir for jumpapp.com on weekdays. Cooking on my days off.

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Elixir ▷ Max @mxgrn.com · Mar 16

When to name your #ElixirLang function with a bang?

Only if the function is *expected* to throw errors during normal execution.

Do not simply 'inherit' bangs from what’s inside that function (`Repo.update!`) if those exceptions would signal a bug (that is, should never happen).

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Elixir ▷ Max @mxgrn.com · 2d

Now I MUST get a copy.

Elixir ▷ Max @mxgrn.com · 3d

bsky.app/profile/mxgr...

Elixir ▷ Max @mxgrn.com · Mar 18

Vibe Mitigation Engineer. Full-time, on-site.

Peter Solnica 🇺🇦 🇵🇱 🇪🇺 @solnic.dev · Mar 18

Vibe Risk Senior Manager

Elixir ▷ Max @mxgrn.com · 10d

Nope, custom config, built through the years. :)

Elixir ▷ Max @mxgrn.com · 11d

Neovim geeks 🫶 — this helps me debug in #ElixirLang:

With the cursor inside a function, :ElixirCopyFuncFqn copies its fully qualified name (FQN) to the clipboard — ready to paste into IEx, local or remote.

github.com/mxgrn/dotfil...

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Elixir ▷ Max @mxgrn.com · 12d

My favorite application of AI? Sharpening my tools.

Just vibe-coded this toggle for #ElixirLang maps in Neovim.

Elixir ▷ Max @mxgrn.com · 13d

Want to disable all unmocked HTTP calls from Req at once during #ElixirLang tests?

Simply add this to test/test_helper.exs:

Req.default_options(
adapter: fn req ->
raise "Unmocked call to #{req.url}"
end
)

(replace `raise` with a log warning if that's more useful)

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Elixir ▷ Max @mxgrn.com · 16d

Very high level!

Elixir ▷ Max @mxgrn.com · 23d

It's easy to keep nudging the AI until it 'fixes' the tests, and it feels like achieving something, while the value of such tests may be plainly negative.
Seeing too many false positives like that lately.

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Elixir ▷ Max @mxgrn.com · 29d

Isn’t it neat that Elixir’s AST is valid Elixir?
What other languages besides Lisp can claim that?

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Elixir ▷ Max @mxgrn.com · Aug 30

It's beyond me why Quokka, the awesome Elixir formatter plugin, has so few stars on GitHub, I use it on every project: github.com/emkguts/quokka

GitHub - emkguts/quokka: A configurable Elixir styler

A configurable Elixir styler. Contribute to emkguts/quokka development by creating an account on GitHub.

github.com

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Elixir ▷ Max @mxgrn.com · Aug 22

Sotano de las golondrinas ❤️

Elixir ▷ Max @mxgrn.com · Aug 18

Interesting! Never realized it had such a narrow application.

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Elixir ▷ Max @mxgrn.com · Aug 5

when oh when

Elixir ▷ Max @mxgrn.com · Aug 4

- macros

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Elixir ▷ Max @mxgrn.com · Jul 15

A very nice, concise, top-level introduction to Elixir and BEAM. Share it with anyone who's willing to understand why you're so lucky to work with the tech. youtu.be/_5B_B_IgtAg

Practical Arguments for Erlang / Elixir - Shawn McCool

YouTube video by Shawn McCool

youtu.be

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Elixir ▷ Max @mxgrn.com · Jun 23

I never miss a talk by Evan Czaplicki, and a fresh one just dropped: www.youtube.com/watch?v=YPAa...

Keynote: Rethinking our Adoption Strategy - Evan Czaplicki | Lambda Days 2025

YouTube video by Code Sync

www.youtube.com

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Elixir ▷ Max @mxgrn.com · Jun 14

Been using Airthings for the past few years, don't know how to assert its accuracy, but otherwise, it works fine.

Elixir ▷ Max @mxgrn.com · May 17

Ok, I ran out of available <c-somekey> mappings. But guess what, Ghostty enabled the whole bunch of <option-somekey>'s for mapping. Current challenge: what finger do I use to press <option>? 🤔

Elixir ▷ Max @mxgrn.com · May 17

Just something to casually mention to your next non-Elixir developer friend.

Josh Price @joshcprice.bsky.social · May 16

Let’s recap:

BBC uses custom Elixir DSLs to serve

📈 600m+ monthly unique views
💻 12 servers (down from 100
🧑‍💻 7 #elixirlang engineers!

Mind blowing! 🤯

Elixir ▷ Max @mxgrn.com · May 16

Yep

Elixir ▷ Max @mxgrn.com · May 15

Me: What's your current favorite escape hatch when LiveView doesn't quite cut it?
Chris McCord: Web components with Lit.
#ElixirConfEU

Elixir ▷ Max @mxgrn.com · Apr 19

#Elixirlang is syntactic sugar for its AST

Elixir ▷ Max @mxgrn.com · Apr 17

Aerospace looks interesting, although usually I have only 1 window per screen (either a browser, or a terminal with tmux or neovim panes).

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Elixir ▷ Max @mxgrn.com · Apr 9

also helps staying unrecognized