Back to doing 4clojure problems. It was interesting to explore update, and also to find out that class names can totally serve as keys in maps in #Clojure
![Problem 50, Split by Type
Difficulty: medium
Write a function which takes a sequence consisting of items with different types and splits them up into a set of homogeneous sub-sequences. The internal order of each sub-sequence should be maintained, but the sub-sequences themselves can be returned in any order (this is why 'set' is used in the test cases).
(= (set (__ [1 :a 2 :b 3 :c])) #{[1 2 3] [:a :b :c]})
🟢 pass
(= (set (__ [:a "foo" "bar" :b])) #{[:a :b] ["foo" "bar"]})
🟢 pass
(= (set (__ [[1 2] :a [3 4] 5 6 :b])) #{[[1 2] [3 4]] [:a :b] [5 6]})
🟢 pass
Write code which will fill in the above blanks:
#(vals
(reduce
(fn [m v] (update m (type v) (fnil conj []) v))
{}
%))](https://assets.merveilles.town/media_attachments/files/115/250/429/315/080/040/original/30e73803c5ff7b10.png "Problem 50, Split by Type
Difficulty: medium
Write a function which takes a sequence consisting of items with different types and splits them up into a set of homogeneous sub-sequences. The internal order of each sub-sequence should be maintained, but the sub-sequences themselves can be returned in any order (this is why 'set' is used in the test cases).
(= (set (__ [1 :a 2 :b 3 :c])) #{[1 2 3] [:a :b :c]})
🟢 pass
(= (set (__ [:a \"foo\" \"bar\" :b])) #{[:a :b] [\"foo\" \"bar\"]})
🟢 pass
(= (set (__ [[1 2] :a [3 4] 5 6 :b])) #{[[1 2] [3 4]] [:a :b] [5 6]})
🟢 pass
Write code which will fill in the above blanks:
#(vals
(reduce
(fn [m v] (update m (type v) (fnil conj []) v))
{}
%))")
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14 posts12 participants0 posts today
Typename syntax and resolution in ClojureCLR
https://dmiller.github.io/clojure-clr-next/general/2025/09/21/typename-syntax-and-resolution.html
Wherein we describe the significant enhancements to typename syntax and resolution in ClojureCLR effective with version 1.12.3-alpha2. TL;DR Several significant improvements have been made to typename syntax and resolution in ClojureCLR. ...
ClojureCLR - Next! · Typename syntax and resolution in ClojureCLRWherein we describe the significant enhancements to typename syntax and resolution in ClojureCLR effective with version 1.12.3-alpha2.
Replacing clojure-lsp with clj-kondo and Refactor-nREPL
https://andreyor.st/posts/2025-09-21-replacing-clojure-lsp-with-clj-kondo-and-refactor-nrepl/
I’ve been programming in Clojure for the last five years. I don’t write much about it here, largely because I use Clojure at work and rarely for hobby projects, so I don’t have much to share. Even today, the post will be more about Clojure tooling,...
andreyor.st · Replacing clojure-lsp with clj-kondo and Refactor-nREPLI’ve been programming in Clojure for the last five years. I don’t write much about it here, largely because I use Clojure at work and rarely for hobby projects, so I don’t have much to share. Even today, the post will be more about Clojure tooling, rather than Clojure itself.
I’ve been using clojure-lsp with Emacs for a couple years now and I still can’t remember the right lines to put in .gitignore
A Clojure-based Portfolio Analysis Tool based on LLM Integration
https://clojurecivitas.github.io/finance/portfolio_analysis/llm_financial_advisor.html
A portfolio analysis program with market narratives generated by an LLM.
Clojure CivitasA Clojure-based Portfolio Analysis Tool based on LLM Integration – Clojure CivitasA portfolio analysis program with market narratives generated by an LLM.
Pouring Gold, statue prototype made with cellular automata coded in #clojure, 2021.
Story time. A function returning a list of some business entities. Each object has a method getContractId. I get a runtime error that java.lang.Character doesn't have a method getContractId. WTF?
Turns out that first function was sometimes returning an error as a string. It was treated as a list of characters, mapped and filtered through many layers. Somewhere deeper some code finally wanted to access getContractId, but instead of an object, it got... the first character of the string
Clojure Deref (Sep 17, 2025)
https://clojure.org/news/2025/09/17/deref
Welcome to the Clojure Deref! This is a weekly link/news roundup for the Clojure ecosystem (feed: RSS). Upcoming Events Clojure real-world-data 35: Sep 19 Clojure South 2025: Oct 6-7 Macroexpand 2025: Oct 17-18, 24-25 Clojure/Conj...
#clojure #clj #cljs !clojure@lemmy.ml @clojure@lemmy.ml
clojure.orgClojure - Clojure Deref (Sep 17, 2025)
Clojure Deref (Sep 17, 2025)
https://clojure.org/news/2025/09/17/deref
Welcome to the Clojure Deref! This is a weekly link/news roundup for the Clojure ecosystem (feed: RSS). Upcoming Events Clojure real-world-data 35: Sep 19 Clojure South 2025: Oct 6-7 Macroexpand 2025: Oct 17-18, 24-25 Clojure/Conj...
clojure.orgClojure - Clojure Deref (Sep 17, 2025)
Rolling Regressions in Clojure for Real-Time Alpha and Beta Monitoring
https://clojurecivitas.github.io/finance/portfolio_analysis/alpha_beta_regression.html
Clojure CivitasRolling Regressions in Clojure for Real-Time Alpha and Beta Monitoring – Clojure Civitas
Annually-Funded Developers' Update: July/August 2025
https://www.clojuriststogether.org/news/annually-funded-developers-update-july/august-2025/
Hello Fellow Clojurists! This is the fourth report from the 5 developers receiving Annual Funding in 2025. Dragan Duric: Apple M Engine Neanderthal, Deep Diamond CPU Eric Dallo: ECA, clojure-lsp, clojure-lsp-intellij Michiel Borkent: clj-kondo,...
www.clojuriststogether.org · Annually-Funded Developers' Update: July/August 2025Dragan Duric, Eric Dallo, Michiel Borkent, Oleksandr Yakushev, Peter Taoussanis
Giving Foundation Models a Notion of Now
https://building.nubank.com/giving-foundation-models-a-notion-of-now/
Author: Fabio Souza At Nubank, we are constantly pushing the boundaries of how Artificial Intelligence can help us better understand our customers’ financial journeys. Our previous posts have detailed how we leverage transformer-based foundation...
Building Nubank · Giving Foundation Models a Notion of Now - Building NubankExploring how encoding transaction timestamps as time deltas rather than absolute dates boosts AI model performance and generalization.
To help people manage their online footprint at @yorba, we first need to wrangle the web presence of countless businesses and organizations.
This is a technical piece on how we use #Clojure to query and classify the world's knowledge.
https://schmud.de/programs/2025-09-02-wikidata-mundaneum.html
schmud.deWikidata and Mundaneum - The Triumph of the Commons
The CIDER debugger and inspector are pretty great. It's been years since I've used them but recently due to a discussion on Clojurians Slack I rediscovered them. So good! #clojure
user=> (:macro (meta #'defmacro))
true
The Power of Bayesian Optimization for Business Success
https://flexiana.com/news/ai/2025/09/bayesian-optimization
The post The Power of Bayesian Optimization for Business Success appeared first on Flexiana.
When I saw #Python code like:
processed = map(normalize, map(clean, filter(is_valid, items)))
I immediately realized why Pythonistas believe that list comprehensions read better. I'm really surprised they didn't add some form of pipeline chaining to make such transformations more natural.
Not a big deal, but after so much #Ruby, #Clojure and #OCaml my mind really struggles to parse such code.
Muon for Improved Foundation Model Pretraining Data Efficiency
https://building.nubank.com/muon-for-improved-foundation-model-pretraining-data-efficiency/
Authors (alphabetical order): Aman Gupta, Arissa Yoshida, Daniel Braithwaite and Rafael Celente, In previous blog posts [1,2,3], we introduced Nubank’s approach for using transaction data-based foundation models to solve predictive problems...
Building Nubank · Muon for Improved Foundation Model Pretraining Data Efficiency - Building NubankWe explored how the Muon optimizer, an innovative alternative to AdamW, helps us build more efficient foundation models, with faster convergence and reduced costs.