Derek Kraan
@derekkraan.bsky.social
#ElixirLang
Former Founder: codecodeship.com
Library Author: Horde, Highlander, CurlReq
Former Founder: codecodeship.com
Library Author: Horde, Highlander, CurlReq
This was such a great “talk” to see in person. Highly recommend.
Our final presentation video.
Sam Aaron takes us all the way out. Lighting the fire of making music with code in all of us. What a blast.
Thank you for enduring these releases. #goatmire will aspire to be quiet until we have something new to share.
goatmire.bold.video/v/e85qw
#elixirlang
Sam Aaron takes us all the way out. Lighting the fire of making music with code in all of us. What a blast.
Thank you for enduring these releases. #goatmire will aspire to be quiet until we have something new to share.
goatmire.bold.video/v/e85qw
#elixirlang
Sonic Pi - Sam Aaron
My heart is full, my brain is full. Does anyone have a UK to EU power adapter?
goatmire.bold.video
January 12, 2026 at 11:35 AM
This was such a great “talk” to see in person. Highly recommend.
Reposted by Derek Kraan
i bought the domain ohhh.lol a while back just because and the other night i noticed it gets like 100-150 unique hits a day from people typing it in their posts and group chats where it tries to load the url preview. so i hope this annoys some people while they're trying to get their mack on
January 7, 2026 at 3:09 AM
i bought the domain ohhh.lol a while back just because and the other night i noticed it gets like 100-150 unique hits a day from people typing it in their posts and group chats where it tries to load the url preview. so i hope this annoys some people while they're trying to get their mack on
Reposted by Derek Kraan
It’s insane that within just a few weeks, two of Canada’s major cities opened polar opposite transit systems.
REM - An extension to a high frequency, fast, fully automated metro system
Finch West - A many years late, over budget, disastrously slow light rail line
REM - An extension to a high frequency, fast, fully automated metro system
Finch West - A many years late, over budget, disastrously slow light rail line
December 7, 2025 at 7:27 PM
It’s insane that within just a few weeks, two of Canada’s major cities opened polar opposite transit systems.
REM - An extension to a high frequency, fast, fully automated metro system
Finch West - A many years late, over budget, disastrously slow light rail line
REM - An extension to a high frequency, fast, fully automated metro system
Finch West - A many years late, over budget, disastrously slow light rail line
Merged and published v0.2.2!
Merkle maps are quickly becoming one of my favorite data structures! github.com/derekkraan/m... 👀 #ElixirLang
Fix Dialyzer errors, update deps, fix 1.19 compiler warnings by Nezteb · Pull Request #9 · derekkraan/merkle_map
When trying to use merkle_map from an Elixir 1.19 project and OTP 28, I was getting Dialyzer errors anytime I tried to use MerkleMap.diff_keys/2 and MerkleMap.equal?/2.
So, I added Dialyzer (and Cr...
github.com
December 5, 2025 at 1:13 PM
Merged and published v0.2.2!
#Marktplaats protip:
userContent.css (in FF, not sure in other browsers)
ul.hz-Listings > :not(.hz-Listing) { display: none; }
This will stop all the scroll-jumping that happens as you try to browse results.
userContent.css (in FF, not sure in other browsers)
ul.hz-Listings > :not(.hz-Listing) { display: none; }
This will stop all the scroll-jumping that happens as you try to browse results.
November 2, 2025 at 8:09 AM
#Marktplaats protip:
userContent.css (in FF, not sure in other browsers)
ul.hz-Listings > :not(.hz-Listing) { display: none; }
This will stop all the scroll-jumping that happens as you try to browse results.
userContent.css (in FF, not sure in other browsers)
ul.hz-Listings > :not(.hz-Listing) { display: none; }
This will stop all the scroll-jumping that happens as you try to browse results.
Reposted by Derek Kraan
who creates the lively art and music scenes if the rent is too high? who makes cultural life? who serves you food or washes your dishes? who creates the fancy little restaurants that draw you to urban living? affordable housing is at the heart of what makes city life worthwhile.
October 26, 2025 at 6:04 AM
who creates the lively art and music scenes if the rent is too high? who makes cultural life? who serves you food or washes your dishes? who creates the fancy little restaurants that draw you to urban living? affordable housing is at the heart of what makes city life worthwhile.
Bring back the railway bubble!
While Trump talks up manufacturing, Bloomberg notes the only real growth outside tech and healthcare is AI data center spending, likening it to past buildouts like the 1870s railways or the 1990s fiber and wireless booms (and bubbles).
The U.S. economy now hinges on OpenAI 10xing revenue in 5 years
The U.S. economy now hinges on OpenAI 10xing revenue in 5 years
October 26, 2025 at 6:13 PM
Bring back the railway bubble!
PSA!
It's so easy to forget to handle websocket reconnects in LV, but if you're deploying regularly, your users are likely seeing A LOT of bugs coming from this.
Go to one of your pages, click around a bit, then run `liveSocket.socket.triggerChanError()`, and see what happens.
#ElixirLang
It's so easy to forget to handle websocket reconnects in LV, but if you're deploying regularly, your users are likely seeing A LOT of bugs coming from this.
Go to one of your pages, click around a bit, then run `liveSocket.socket.triggerChanError()`, and see what happens.
#ElixirLang
October 7, 2025 at 2:43 PM
PSA!
It's so easy to forget to handle websocket reconnects in LV, but if you're deploying regularly, your users are likely seeing A LOT of bugs coming from this.
Go to one of your pages, click around a bit, then run `liveSocket.socket.triggerChanError()`, and see what happens.
#ElixirLang
It's so easy to forget to handle websocket reconnects in LV, but if you're deploying regularly, your users are likely seeing A LOT of bugs coming from this.
Go to one of your pages, click around a bit, then run `liveSocket.socket.triggerChanError()`, and see what happens.
#ElixirLang
I'm pulling the plug on Code Code Ship next week Friday.
As part of this, I'm releasing highlander_pg as open source. It's a variant of my original highlander package, which uses postgres advisory locks. It's solid! It is ergonomic! It is production-tested!
hex.pm/packages/hig...
#elixirlang
As part of this, I'm releasing highlander_pg as open source. It's a variant of my original highlander package, which uses postgres advisory locks. It's solid! It is ergonomic! It is production-tested!
hex.pm/packages/hig...
#elixirlang
highlander_pg
There can only be one! (run a globally unique singleton process)
hex.pm
September 19, 2025 at 12:44 PM
I'm pulling the plug on Code Code Ship next week Friday.
As part of this, I'm releasing highlander_pg as open source. It's a variant of my original highlander package, which uses postgres advisory locks. It's solid! It is ergonomic! It is production-tested!
hex.pm/packages/hig...
#elixirlang
As part of this, I'm releasing highlander_pg as open source. It's a variant of my original highlander package, which uses postgres advisory locks. It's solid! It is ergonomic! It is production-tested!
hex.pm/packages/hig...
#elixirlang
Reposted by Derek Kraan
Wrapped up my conference season for this year with #goatmire Elixir. Had too much fun telling a story one last time, and had even more fun watching some of the most unusual and memorable talks I've ever seen.
Photo credits: @petterbos.bsky.social
Photo credits: @petterbos.bsky.social
September 15, 2025 at 6:24 AM
Wrapped up my conference season for this year with #goatmire Elixir. Had too much fun telling a story one last time, and had even more fun watching some of the most unusual and memorable talks I've ever seen.
Photo credits: @petterbos.bsky.social
Photo credits: @petterbos.bsky.social
Testing out Elixir 1.19-rc.0. App compilation times are unchanged.
But dependency compilation is pinning all 24 cores on my machine and is down to 55s from 143s. Big upgrade!
#elixirlang
But dependency compilation is pinning all 24 cores on my machine and is down to 55s from 143s. Big upgrade!
#elixirlang
September 15, 2025 at 8:36 AM
Testing out Elixir 1.19-rc.0. App compilation times are unchanged.
But dependency compilation is pinning all 24 cores on my machine and is down to 55s from 143s. Big upgrade!
#elixirlang
But dependency compilation is pinning all 24 cores on my machine and is down to 55s from 143s. Big upgrade!
#elixirlang
Reposted by Derek Kraan
I just published this video, and the next night, Russia launches drones at Poland. It really underscores the point. The European NATO countries need Ukraine just as much as Ukraine needs security guarantees from them.
European security depends on Ukraine
YouTube video by Anders Puck Nielsen
www.youtube.com
September 10, 2025 at 6:07 AM
I just published this video, and the next night, Russia launches drones at Poland. It really underscores the point. The European NATO countries need Ukraine just as much as Ukraine needs security guarantees from them.
youtu.be/RxapAZRYJ6I?... I have to post this video by @anderspucknielsen.dk. If you want to know how (and why) Ukraine really fits into our security in Europe then watch this video.
European security depends on Ukraine
YouTube video by Anders Puck Nielsen
youtu.be
September 10, 2025 at 7:22 AM
youtu.be/RxapAZRYJ6I?... I have to post this video by @anderspucknielsen.dk. If you want to know how (and why) Ukraine really fits into our security in Europe then watch this video.
Reposted by Derek Kraan
Toronto has tried this with Bloor, University and Yonge by installing bike lanes, making the street safer, slower for all and Ford is going to court again to rip them out. So speed cameras it as good as we might get (ignoring the "tax grab" nonsense toddler rhetoric).
I agree with Ford on this. These cameras are nothing but a tax grab
If municipalities were serious about managing speed they would design the roads appropriately
Cameras should be the last tool used
If municipalities were serious about managing speed they would design the roads appropriately
Cameras should be the last tool used
September 9, 2025 at 4:37 PM
Toronto has tried this with Bloor, University and Yonge by installing bike lanes, making the street safer, slower for all and Ford is going to court again to rip them out. So speed cameras it as good as we might get (ignoring the "tax grab" nonsense toddler rhetoric).
Reposted by Derek Kraan
A friend’s 3-year old on a pedestrian street: “There’s no cars here so we don’t have to hold hands. I can run!”
August 19, 2025 at 3:19 PM
A friend’s 3-year old on a pedestrian street: “There’s no cars here so we don’t have to hold hands. I can run!”
Reposted by Derek Kraan
In #Phoenix #LiveView v1.1.0-rc.0 we shipped `:key` support for comprehensions in HEEx. The idea was to finally be able to have change tracking in comprehensions. We did this by leveraging LiveComponents. Sounds easy enough, right? There were some problems though. A thread. #MyElixirStatus
July 7, 2025 at 1:09 PM
In #Phoenix #LiveView v1.1.0-rc.0 we shipped `:key` support for comprehensions in HEEx. The idea was to finally be able to have change tracking in comprehensions. We did this by leveraging LiveComponents. Sounds easy enough, right? There were some problems though. A thread. #MyElixirStatus
PSA: Tailwind (aka Phoenix) users should add the following CSS to their project:
.\@container > * + * { border: 5px solid red !important; }
With a comment saying "if you see this, you messed up, containers should only ever have one child element!"
#elixirlang
.\@container > * + * { border: 5px solid red !important; }
With a comment saying "if you see this, you messed up, containers should only ever have one child element!"
#elixirlang
July 7, 2025 at 3:32 PM
PSA: Tailwind (aka Phoenix) users should add the following CSS to their project:
.\@container > * + * { border: 5px solid red !important; }
With a comment saying "if you see this, you messed up, containers should only ever have one child element!"
#elixirlang
.\@container > * + * { border: 5px solid red !important; }
With a comment saying "if you see this, you messed up, containers should only ever have one child element!"
#elixirlang
Are we doing transit hot takes?
America (🇺🇸) has lots of transit actually, it just needs to use it.
America has a land use problem, not a transit problem.
(Exception: NYC)
America (🇺🇸) has lots of transit actually, it just needs to use it.
America has a land use problem, not a transit problem.
(Exception: NYC)
It is remarkable how many supposedly pro transit politicians do not understand that we do not have a capital underinvestment problem, but a costs problem
June 24, 2025 at 2:59 PM
Are we doing transit hot takes?
America (🇺🇸) has lots of transit actually, it just needs to use it.
America has a land use problem, not a transit problem.
(Exception: NYC)
America (🇺🇸) has lots of transit actually, it just needs to use it.
America has a land use problem, not a transit problem.
(Exception: NYC)
Reposted by Derek Kraan
One of the most consequential transit Youtube videos has just dropped:
How Hong Kong built the world's most valuable subway
YouTube video by The Flying Moose
www.youtube.com
June 8, 2025 at 1:47 PM
One of the most consequential transit Youtube videos has just dropped:
Reposted by Derek Kraan
It's that time of year again: Stack Overflow survey!
Do your part and represent your community!
#ElixirLang
stackoverflow.az1.qualtrics.com/jfe/form/SV_...
Do your part and represent your community!
#ElixirLang
stackoverflow.az1.qualtrics.com/jfe/form/SV_...
2025 Developer Survey | Stack Overflow
Stack Overflow's annual Developer Survey is for the worldwide developer and technology community to answer questions about what they use and how they feel about the latest in technology.
stackoverflow.az1.qualtrics.com
May 31, 2025 at 3:04 PM
It's that time of year again: Stack Overflow survey!
Do your part and represent your community!
#ElixirLang
stackoverflow.az1.qualtrics.com/jfe/form/SV_...
Do your part and represent your community!
#ElixirLang
stackoverflow.az1.qualtrics.com/jfe/form/SV_...
TIL ExUnit has an assert/2, where you can provide a message to show if the assertion fails! This makes communicating intent of tests so much easier.
h/t @richardtaylor.dev who used this in our codebase, never seen it before!
hexdocs.pm/ex_unit/1.12...
h/t @richardtaylor.dev who used this in our codebase, never seen it before!
hexdocs.pm/ex_unit/1.12...
ExUnit.Assertions — ExUnit v1.12.3
hexdocs.pm
June 3, 2025 at 8:51 AM
TIL ExUnit has an assert/2, where you can provide a message to show if the assertion fails! This makes communicating intent of tests so much easier.
h/t @richardtaylor.dev who used this in our codebase, never seen it before!
hexdocs.pm/ex_unit/1.12...
h/t @richardtaylor.dev who used this in our codebase, never seen it before!
hexdocs.pm/ex_unit/1.12...
Reposted by Derek Kraan
As we're getting ready for the first release candidate of #Phoenix #LiveView 1.1, I want to write about some of the new features and improvements we've been working on. A thread!
#ElixirLang #MyElixirStatus
#ElixirLang #MyElixirStatus
May 30, 2025 at 10:40 AM
As we're getting ready for the first release candidate of #Phoenix #LiveView 1.1, I want to write about some of the new features and improvements we've been working on. A thread!
#ElixirLang #MyElixirStatus
#ElixirLang #MyElixirStatus
Reposted by Derek Kraan
omg every neuron of my brain just started sparking with joy at this subreddit www.reddit.com/r/ThingsCutI...
Things Cut in Half
For your cut in half needs.
www.reddit.com
May 15, 2025 at 6:01 PM
omg every neuron of my brain just started sparking with joy at this subreddit www.reddit.com/r/ThingsCutI...