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wycats's profile
Yehuda Katz 🥨
Yehuda Katz 🥨
Yehuda Katz  🥨
Verified account
@wycats

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Yehuda Katz  🥨Verified account

@wycats

Tilde Co-Founder, OSS enthusiast and world traveler.

Portland, OR
yehudakatz.com
Joined August 2007

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    1. Who ordered *that*?‏ @ManishEarth Jan 8
      Replying to @withoutboats @nick_r_cameron

      I suspect throws will help folks coming from other languages, and it fits more naturally into the function as a sentence. The problem with "it's catch because it catches it" is that it leads to a mental model that makes you want to put catch on all fns catching even sans rethrow

      1 reply 0 retweets 1 like
    2. Who ordered *that*?‏ @ManishEarth Jan 8
      Replying to @ManishEarth @withoutboats @nick_r_cameron

      Besides, APIs shouldn't describe what's going on internally.

      1 reply 0 retweets 1 like
    3. Who ordered *that*?‏ @ManishEarth Jan 8
      Replying to @ManishEarth @withoutboats @nick_r_cameron

      Using `catch` for opposite-ish things reminds me of `static` in C and the confusing nature of addr-of and by-ref syntax both using & even when they mean opposite things.

      2 replies 0 retweets 0 likes
    4. Yehuda Katz  🥨‏Verified account @wycats Jan 8
      Replying to @ManishEarth @withoutboats @nick_r_cameron

      It has a similar problem imo as the two uses of `unsafe`. I think we can do better than `catches`. Do we not like `throws` because it gives the wrong idea to Java programmers?

      2 replies 0 retweets 1 like
    5. spooky twink divorcée (abolish ICE)‏ @withoutboats Jan 8
      Replying to @wycats @ManishEarth @nick_r_cameron

      Hmm the comparison to unsafe is interesting, but do you think that was a mistake? I think it’s very easy for a new user to just think of the function as an unsafe scope, and similarly here think of the function as a catch boundary

      2 replies 0 retweets 0 likes
    6. Yehuda Katz  🥨‏Verified account @wycats Jan 8
      Replying to @withoutboats @ManishEarth @nick_r_cameron

      I see no reason why we shouldn't have used vouch {} or trust {} and strongly prefer them. The problem with "catches" is that the English word really implies that it was caught inside the boundary. But actually it's saying "you need to catch".

      1 reply 0 retweets 1 like
    7. Yehuda Katz  🥨‏Verified account @wycats Jan 8
      Replying to @wycats @withoutboats and

      Further, if we're comfortable with the word "catch" the verb that creates a thing to be caught is "throw". We should either go with the analogy or find another one :)

      2 replies 0 retweets 1 like
    8. spooky twink divorcée (abolish ICE)‏ @withoutboats Jan 8
      Replying to @wycats @ManishEarth @nick_r_cameron

      I think the analogy is clear but different. ?/throw throws, catch catches (and packages it into a result)

      1 reply 0 retweets 0 likes
    9. Who ordered *that*?‏ @ManishEarth Jan 8
      Replying to @withoutboats @wycats @nick_r_cameron

      Right. But a catch function doesn't necessarily need to catch internally. In fact I suspect catch blocks will be relatively rare compared to function return catches because you'll use ?. And describing what's going on *inside* the function is not something you want on an API

      1 reply 0 retweets 0 likes
    10. spooky twink divorcée (abolish ICE)‏ @withoutboats Jan 8
      Replying to @ManishEarth @wycats @nick_r_cameron

      I don’t follow your thought process A catch function and a catch block are both “catch” boundaries. Why should a catch function contain catch blocks????

      2 replies 0 retweets 0 likes
      Yehuda Katz  🥨‏Verified account @wycats Jan 8
      Replying to @withoutboats @ManishEarth @nick_r_cameron

      "catches takes an exception and turns it into a Result" has something to it, but it's not congruous with the one-frame reality of the Result time. That mental model really implies that if you don't "catch" it keeps going.

      7:48 PM - 8 Jan 2018
      • 1 Like
      • Who ordered *that*?
      1 reply 0 retweets 1 like
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        2. spooky twink divorcée (abolish ICE)‏ @withoutboats Jan 8
          Replying to @wycats @ManishEarth @nick_r_cameron

          No but that’s the wonderful thing about catch: this is how we’re different, we don’t let you throw nonlocally, you have to explicitly (😉) re-throw in each function, no hidden control flow paths

          1 reply 0 retweets 2 likes
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