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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. Patrick Walton‏ @pcwalton 4 Sep 2018
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      Replying to @strega_nil @graydon_pub

      Agreed! Too many people on both sides equate “generics” with “C++’s implementation of generics”. If I were designing Go, given the choice between interfaces and ML-style generics I would have chosen the latter.

      1 reply 0 retweets 0 likes
    2. Michael Schurter‏ @schmichael 4 Sep 2018
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      Replying to @pcwalton @graydon_pub

      Link to learn ML generics? ML is harder to search for than even Go. 😅

      1 reply 0 retweets 0 likes
    3. postmodern girl‏ @strega_nil 4 Sep 2018
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      Replying to @schmichael @pcwalton @graydon_pub

      https://en.wikipedia.org/wiki/Hindley%E2%80%93Milner_type_system …

      1 reply 0 retweets 1 like
    4. postmodern girl‏ @strega_nil 4 Sep 2018
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      Replying to @strega_nil @schmichael and

      I dunno, there are probably better resources if you want to get in depth, like, Types and Programming Languages, but that's a good overview.

      1 reply 0 retweets 0 likes
    5. Michael Schurter‏ @schmichael 4 Sep 2018
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      Replying to @strega_nil @pcwalton @graydon_pub

      Yeah, I'm having a really hard time figuring out how this would look in Go... ...are there no online language docs for ML?

      2 replies 0 retweets 0 likes
    6. Patrick Walton‏ @pcwalton 4 Sep 2018
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      Replying to @schmichael @graydon_pub

      I’ll describe it in a tweet. Syntax: func Map<T,U>(array T[], f func(T) T) U[] { ... } == works on all types, panics if you compare closures < > <= >=, ditto There’s a builtin function func Hash<T>(obj T) u64 which can hash things. That’s it.

      2 replies 0 retweets 0 likes
    7. Patrick Walton‏ @pcwalton 4 Sep 2018
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      Replying to @pcwalton @schmichael @graydon_pub

      Oops, make that func Map<T,U>(array T[], f func(val T) U) U[]

      1 reply 0 retweets 1 like
    8. Michael Schurter‏ @schmichael 4 Sep 2018
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      Replying to @pcwalton @graydon_pub

      What is array in this example and why isn't it implied by the [] on T? Likewise what does the val keyword denote?

      1 reply 0 retweets 0 likes
    9. postmodern girl‏ @strega_nil 4 Sep 2018
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      Replying to @schmichael @pcwalton @graydon_pub

      that's just Go syntax for parameters

      2 replies 0 retweets 0 likes
    10. postmodern girl‏ @strega_nil 4 Sep 2018
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      Replying to @strega_nil @schmichael and

      the important point is, generics in ML basically don't allow you to do anything with objects of the underlying type except pass them around.

      2 replies 0 retweets 2 likes
      Patrick Walton‏ @pcwalton 4 Sep 2018
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      Replying to @strega_nil @schmichael @graydon_pub

      Yes. OCaml has a few exceptions for convenience, like hashing and comparison (also debug printing of objects in an extension). Very much in keeping with how Go works.

      9:42 PM - 4 Sep 2018 from Dogpatch, San Francisco
      1 reply 0 retweets 0 likes
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        2. postmodern girl‏ @strega_nil 4 Sep 2018
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          Replying to @pcwalton @schmichael @graydon_pub

          It's not a part of the underlying type system tho, importantly, imo. They're just functions which are given by the runtime system with the type `'a . 'a -> 'a -> bool`

          1 reply 0 retweets 1 like
        3. Michael Schurter‏ @schmichael 4 Sep 2018
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          Replying to @strega_nil @pcwalton @graydon_pub

          There's that syntax functional programmers seem to think liberal arts majors like me understand. 😅

          1 reply 0 retweets 1 like
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