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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    1. postmodern girl‏ @strega_nil 30 Apr 2019
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      Replying to @graydon_pub @pcwalton

      hot take: typeclasses are the third best feature of Rust

      4 replies 1 retweet 3 likes
    2. Yaah  🍑 🦀 ☕‏ @yaahc_ 30 Apr 2019
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      Replying to @strega_nil @graydon_pub @pcwalton

      third?

      1 reply 0 retweets 2 likes
    3. postmodern girl‏ @strega_nil 30 Apr 2019
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      Replying to @yaahc_ @graydon_pub @pcwalton

      1) value semantics, 2) lifetime checker, 3) typeclasses

      1 reply 0 retweets 6 likes
    4. postmodern girl‏ @strega_nil 30 Apr 2019
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      Replying to @strega_nil @graydon_pub @pcwalton

      I guess one could argue tagged union types above typeclasses? they're both so so nice though

      2 replies 0 retweets 3 likes
    5. Sam Tobin-Hochstadt‏ @samth 30 Apr 2019
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      Replying to @strega_nil @graydon_pub @pcwalton

      ML is a nice programming language and trading ADTs for type classes would make it worse.

      1 reply 0 retweets 3 likes
    6. postmodern girl‏ @strega_nil 30 Apr 2019
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      Replying to @samth @graydon_pub @pcwalton

      ML has a different feature that is similar to typeclasses, though. Would you remove tagged unions, or modules? I think I'd remove tagged unions.

      2 replies 0 retweets 0 likes
    7. Sam Tobin-Hochstadt‏ @samth 30 Apr 2019
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      Replying to @strega_nil @graydon_pub @pcwalton

      I'd remove modules in a heartbeat. F# is a good language.

      1 reply 0 retweets 0 likes
    8. postmodern girl‏ @strega_nil 30 Apr 2019
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      Replying to @samth @graydon_pub @pcwalton

      I personally disagree, since I'd rather write C++ than F#

      2 replies 0 retweets 0 likes
    9. postmodern girl‏ @strega_nil 30 Apr 2019
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      Replying to @strega_nil @samth and

      (language with modules but without builtin sum types) for me is > (language without modules but with builtin sum types)

      1 reply 0 retweets 0 likes
    10. Sam Tobin-Hochstadt‏ @samth 30 Apr 2019
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      Replying to @strega_nil @graydon_pub @pcwalton

      I've written substantial programs in both SML and OCaml, and in neither one did I use the module system in a way that wouldn't work in the Haskell module system.

      2 replies 0 retweets 0 likes
      Patrick Walton‏ @pcwalton 30 Apr 2019
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      Replying to @samth @graydon_pub

      The one thing I kind of want is the ability to pass a trait to a singleton module without threading it around, for dependency injection. (I don’t believe in DI as a way of life, but sometimes it’s a useful pattern.) I’m not sure the ML module system is that great at DI though.

      7:48 PM - 30 Apr 2019
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        2. Patrick Walton‏ @pcwalton 30 Apr 2019
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          Replying to @pcwalton @samth @graydon_pub

          Like, SML’s module system looks nice on paper, but I’ve worked with it in anger (at UChicago) and hated it.

          2 replies 1 retweet 1 like
        3. Patrick Walton‏ @pcwalton 30 Apr 2019
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          Replying to @pcwalton @samth @graydon_pub

          I understand what they’re trying to do, but the usability is pretty bad. More work is needed.

          1 reply 0 retweets 0 likes
        4. 9 more replies
        1. corvus frugilegus‏ @glaebhoerl 1 May 2019
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          Replying to @pcwalton

          (...what's a singleton module, and what do you mean by "passing a trait" to it?)

          0 replies 0 retweets 1 like
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        1. Yawar Amin‏ @yawaramin 1 May 2019
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          Replying to @pcwalton @samth @graydon_pub

          ML module functors are an almost perfect fit for DI: you can inject not only values but also types and other modules, and wire up your actual modules at a different location (hell, even dynamically in OCaml).

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