The REPL

The REPL

Daniel Compton talks to Clojure and ClojureScript developers about the libraries and systems they have built. They dive into the nitty-gritty details and technical challenges the authors faced.

Episodes

56: XTDB: A Bitemporal database in Clojure

June 13, 2025 • 77 mins
Jeremy Taylor and James Henderson talk about building XTDB, bitemporality, SQL compatibility, and Apache Arrow. Launching XTDB v2 Grid Dynamics acquires JUXT LSM Tree The Generational Hypothesis JUXT Cast - Viktor Leis HTAP Processing Are We There Yet - Rich Hickey Jepsen Consistency Tree Jepsen Datomic test Jepsen Postgres test Andy Pavlo - CMU Intro to Database Systems sqllogictest
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55: Instant: a modern Firebase in Clojure, with Stepan Parunashvili

October 18, 2024 • 52 mins
Stepan Parunashvili talks about Instant, datalog, building a database in Clojure, and the demands of building modern applications. Instant Datomic Database in the Browser, a spec A Graph-Based Firebase Tonsky (Nikita Prokopov) The Web after Tomorrow WorldStore: Distributed caching with Reactivity - Asana How Figma’s multiplayer technology works Datascript Google CEL: Common Expression Language Amazon Aurora Instant is hiring!
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54: JRuby with Charles Oliver Nutter

September 16, 2024 • 54 mins
Charles Oliver Nutter talks about JRuby, the JVM, JRuby 10, improving JRuby startup time, and going independent. JRuby Headius Enterprises Valhalla - Where Are We? at the JVM Language Summit
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53: Clojure LSP with Eric Dallo

April 21, 2024 • 33 mins
Eric Dallo talks about the LSP protocol, and Clojure LSP. Sorry about the audio quality on this recording, I missed that I was using my MacBook Microphone instead of my podcast microphone. Clojure LSP Langserver.org lsp-mode clj-kondo analysis data clojure-lsp-intellij
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52: Coding in YAML with Ingy döt Net

April 14, 2024 • 58 mins
Ingy döt Net talks about his new programming language YAMLScript, compiling YAML to Clojure, and the development of the YAML format. SML mailing list archive ActiveState Data::Denter Zope Ingy.net personal website Acmeism SnakeYAML / clj-yaml BPAN PST - Package Super Tool YAMLScript docs release-yamlscript file Yes expressions e.g. a(b c) => (a b c) and (a + b) => (+ a b) Deno - capabilities/permissions Advent of YAMLScript ...
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51: Building a text editor with Nate Hunzaker

March 4, 2024 • 57 mins
Nate Hunzaker talks about building a text editor for the web. Slate Lexical beforeInput event Since the podcast was recorded, Whimsical launched our Grammarly integration
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50: Peter Taoussanis

February 27, 2024 • 92 mins
Peter Taoussanis talks about Sente, Timbre, Carmine, Nippy, Tufte, and many more of his libraries. The work of Peter Taoussanis Encore naming conventions Paul Graham’s A Plan for Spam Quivre Wusoup
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49: Clerk with Martin Kavalar

December 29, 2023 • 32 mins
Martin Kavalar talks about Clerk. Clerk: Moldable Live Programming for Clojure - PX23 paper Source code for the PX23 paper PDF paper from Latex via Pandoc Pandoc https://2023.programming-conference.org/ https://clerk.vision/ https://github.clerk.garden/ https://mybinder.org/ https://daringfireball.net/linked/2012/12/10/bold-poker Úll conference https://boldpoker.net/ https://boldpoker.net/ull https://www.clojuriststogether.org/mem...
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48: Biff with Jacob O'Bryant

September 15, 2023 • 49 mins
Jacob O'Bryant talks about Biff, XTDB, and building a web framework for small teams. Tools for Online Speech - Jacob’s Personal Site Biff website Biff GitHub Biff’s funding announcement Clojurists Together funding announcement XTDB TailwindCSS HTMX Biff upgrade instructions Yakread
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47: Executable textbooks with Sam Ritchie

January 12, 2023 • 54 mins
Sam Ritchie talks about the Mentat Collective, executable textbooks, visual math. Mentat Collective GitHub - read this first to get an overview of all of the pieces. ThinkFun Mark Engelberg Cascalog Google X The Dynamic Notebook Structure and Interpretation of Classical Mechanics SICM free online version maria.cloud Brad Feld, John Underkoffler How to fold a Julia fractal Clerk Sicmutils Scmutils SICM-utils Scicloj meetup Road to ...
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46: ClojureDart with Christophe Grand and Baptiste Dupuch

December 23, 2022 • 41 mins
Christophe Grand and Baptiste Dupuch talk about ClojureDart, a new dialect of Clojure. ClojureDart Skia flutter-mx DartClojure Tweet from showing code reduction vs Dart ClojureDart workshop - ClojureStream
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45: Data Rabbit with Ryan Robitaille

October 3, 2022 • 29 mins
Ryan Robitaille talks about data visualisation, and building a visual coding environment in Clojure. Data Rabbit “Programming is blindly manipulating symbols” - Bret Victor Storybook
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44: Jank with Jeaye Wilkerson

September 17, 2022 • 42 mins
Jeaye Wilkerson talks about compilers, LLVM, and building a dynamic, compiled Clojure. Note: I used the wrong link initially when publishing this episode. If you are hearing the wrong conversation, delete the episode and re-download it. Thanks! Jeaye has a background in C++ systems programming, focusing on games and game engines. After 5 years of that, he co-founded an esports tournament startup written in full-stack Clojure for an...
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43: Clojure, The Essential Reference with Renzo Borgatti

November 12, 2021 • 58 mins
Renzo Borgatti talks about what he learnt while creating his reference of the Clojure standard library, and about the re:Clojure conference.. Clojure, The Essential Reference, use the discount code “podrepl20” for a 40% discount on all products seque - clojure.core History of Clojure paper - A History of Clojure talk, A History of Clojure (PDF) use-context-classloader get rid of root classloader commit definline Contrib Libraries ...
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42: Faster JSON parsing with Erik Assum

October 7, 2021 • 55 mins
Erik Assum talks about clj-commons, speeding up clojure.data.json, and asks Daniel what he's been up to.. Idealcast - Gene Kim, Michael Nygard, part 2 CLJ Commons clojure.data.json Clojure’s JSON ecosystem Erik’s commits to data.json JSON performance testing Ardoq Careers
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41: Clojure pre-history with Chris Houser

September 20, 2021 • 39 mins
Chris Houser (Chouser) reflects on the early years of Clojure, Clojure's features, and applying the lessons of Clojure elsewhere.. Note: this podcast was recorded in April 2020 but not published until now. Some of the references are a little outdated, but there’s still some great stuff here that I wanted to get out. In particular, it doesn’t seem like COVID spreads via metal surfaces very much. (00:00) Intro (00:27) The...
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40: Shipping Clojure code with Paulus Esterhazy

September 13, 2021 • 57 mins
Paulus Esterhazy talks about trunk-based development, monorepos, path-focused design, and fast feedback. Pitch clojureD 2020: “Angels Singing: Writing for Programmers” by Paulus Esterhazy Monorepos and the Fallacy of Scale Trunk based development GeePaw Hill Path-Focused Design DORA Metrics to Measure DevOps Performance The RAT: Rework Avoidance Theory Understanding Incremental Switchover bhauman/devcards juxt/bidi Bur...
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39: Clojure Goes Fast with Alexander Yakushev

September 6, 2021 • 58 mins
Alexander Yakushev talks about performance measurement tools, and Clojure Goes Fast. Grammarly Clojure Goes Fast clj-async-profiler Why (Most) Sampling Java Profilers Are Terrible JVisualVM clj-memory-meter Eclipse Memory Analyzer (MAT) Introspection tool: object memory meter Introspection tools: Java decompilers clojuredocs unchecked-math clj-decompiler.el jvm-hiccup-meter jvm-alloc-rate-meter jHiccup Shenandoah in production Azu...
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38: Banking and Clojure with Allen Rohner

August 30, 2021 • 28 mins
Allen Rohner talks about Griffin, building a new bank, and Bazel. Griffin Monzo New Bank Start-up unit 2008 United Kingdom bank rescue package griffinbank/rules_clojure spectrum Griffin API docs
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37: The Clojurists Together Foundation with lvh

May 21, 2020 • 24 mins
lvh talks about the Clojurists Together Foundation.. Announcing the Clojurists Together Foundation Clojurists Together Announcing Summer of Bugs Apply for funding Clojurists Together if Funding Clojars Clojurists Together Membership App
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