stuarthalloway

@stuarthalloway

Helping developers become problem solvers. Cognitect, Clojure, Datomic.

Chapel Hill, NC, USA
cognitect.com
Joined March 2008
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  1. Pinned Tweet
    21 Oct 2018

    There are many REPL development workflows. This one is mine.

    8 retweets 112 likes
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  2. 13 minutes ago

    Thanks! We are thrilled to be here.

    Welcome to ! Very excited to count with your help to continue to use great technology to free Latin-Americans from the complexities of financial services
    1 reply 1 retweet 19 likes
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  3. Retweeted
    28 minutes ago

    Cognitect joins Nubank!

    2 replies 46 retweets 82 likes
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  4. 11 hours ago

    s/despite/because

    Clojure is the language where I'm most often able to successfully think through changes to a program, do them without running anything, then run it, and everything mostly works. That's without any form of static type system.
    3 replies 1 retweet 17 likes
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  5. Jul 21

    "Breaking change was and is considered extremely bad, and it is strenuously avoided in " --

    4 replies 22 retweets 96 likes
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  6. Jul 15

    I am not going to wait...

    Replying to @garybernhardt
    2025: Using , deterministic package resolution. no ranges, git deps, community do not use "semver", software grows, nothing breaks.
    2 retweets 36 likes
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  7. Retweeted
    Jul 14

    You can try Datomic dev-local with the datomic-samples databases:

    16 retweets 41 likes
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  8. Retweeted
    Jul 13

    Language triumphalism is incredibly annoying but I can't help but observe that this is, to a first approximation, not at all a problem in clojure. Plenty of other tradeoffs, but Rich made stability a core design imperative and the library ecosystem reflects that.

    2010: Working on a Python project. 31 dependencies. Sometimes something breaks during an upgrade. 2015: Working on a Rails project. 175 dependencies. Most upgrades break something. 2020: Working on a Node project. 3,069 dependencies. Every upgrade breaks 10ish dependencies. 2025:
    2 replies 8 retweets 32 likes
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  9. Retweeted
    Jul 10

    Develop and test Datomic client applications with minimal setup using the new dev-local tooling.

    1 reply 23 retweets 74 likes
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  10. Jul 10

    "The REPL can give you a lot of velocity, but do not mistake motion for progress. You should always come to the REPL with a plan"

    3 replies 22 retweets 85 likes
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  11. Jul 7

    Using traffic to rate tech is like rating cars by how many you see in the repair shop.

    20 replies 304 retweets 1,159 likes
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  12. Jul 7

    We encourage developers to think about why before how (rationales > examples), which also leads to less reliance on StackOverflow.

    4 replies 8 retweets 50 likes
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  13. Jul 7

    devs need less StackOverflow to get stuff done, even as the community grows.

    Projecting trends into the future can be a lot of fun, and pretty revelatory of future trends. For example, find out which of these programming languages has the brightest future: Clojure? Julia? Scala? Swift? R? JavaScript? Python?
    Show this thread
    9 replies 14 retweets 89 likes
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  14. Retweeted
    Jul 1

    The slightly tardy June edition (Episode 153) of the Cognicast is live with Ghadi talking to Chris Nuernberger about libpython and the tango.

    11 retweets 17 likes
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  15. Retweeted
    Jun 26

    Those who have stayed inside, wore masks in public, and socially distanced during this entire pandemic are the same people who are used to doing the whole group project by themselves

    3,021 replies 120,641 retweets 563,606 likes
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  16. Jun 26

    REPL

    Has anyone built the opposite of code linters? Instead of only telling me all the stuff I did wrong, tell me all the stuff I did right so I'm excited to keep going :D.
    31 retweets 152 likes
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  17. Jun 24

    Hey , how many programmers do you have today?

    Replying to @lukego @evalparse @svetlyak40wt
    Yeah, the accepted wisdom on Lisp seems to be that it's extremely productive for solo programmers working on smaller projects, but presents some challenges for larger teams working on larger projects. I have heard a few anecdotes about teams using Clojure successfully though.
    5 replies 5 retweets 82 likes
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  18. Jun 24

    Every database useful enough to have a second program access it.

    Replying to @alexelcu @propensive
    I’d like to see just one example where data structures survived code that operated on it 😉
    2 replies 11 retweets 73 likes
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  19. Jun 19

    Masks melt snowflakes.

    2 retweets 18 likes
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  20. Retweeted
    Jun 17

    As a lone developer the stability of is a huge advantage. I can maintain multiple sites and services with a fraction of the effort.

    Hours of design can save you years of patching.
    22 retweets 139 likes
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  21. Jun 18

    Building a thing, edition. Explore at the REPL, 4x faster than with unit testing. Generate 800,000 inputs to test a tricky bit. 500 LOC and no automated tests yet. Write functional tests when the plan settles.

    6 replies 19 retweets 139 likes
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