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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. David S Herm-kins‏ @littlecalculist 10 Oct 2017
      Replying to @pamelafox

      I’m so sorry! @wycats warned me const was a mistake for this exact reason and I didn’t take it seriously enough. One of my main ES6 regrets.

      3 replies 13 retweets 45 likes
    2. use std::mem::transmute;‏ @theomn 10 Oct 2017
      Replying to @littlecalculist @pamelafox @wycats

      I still don't get why not to use const for everything unless you explicitly need to rebind the name for some reason.

      2 replies 0 retweets 21 likes
    3. David S Herm-kins‏ @littlecalculist 10 Oct 2017
      Replying to @theomn @pamelafox @wycats

      Let’s take this off poor @pamelafox’s mentions, y’all. She’s suffering enough with this needless debate within her own company!

      1 reply 0 retweets 1 like
    4. use std::mem::transmute;‏ @theomn 10 Oct 2017
      Replying to @littlecalculist @wycats

      Sure, but am I reading your reply correctly in that the regret is `let` vs `const` is a source of debate? I still don't get it.

      2 replies 0 retweets 1 like
    5. David S Herm-kins‏ @littlecalculist 10 Oct 2017
      Replying to @theomn @wycats

      Your preferred style is indeed a popular one, possibly the most popular one. However IMO it leads to considerably worse code. 1/

      2 replies 3 retweets 7 likes
    6. David S Herm-kins‏ @littlecalculist 10 Oct 2017
      Replying to @littlecalculist @theomn @wycats

      People tend to think "letting readers know whether my local binding is mutated is important enough to signal with a keyword." I disagree 2/

      3 replies 1 retweet 2 likes
    7. David S Herm-kins‏ @littlecalculist 10 Oct 2017
      Replying to @littlecalculist @theomn @wycats

      Mutation is difficult to manage *in the large* and deserves careful annotation. Const doesn't help with this. 3/

      2 replies 1 retweet 7 likes
    8. David S Herm-kins‏ @littlecalculist 10 Oct 2017
      Replying to @littlecalculist @theomn @wycats

      In the small, it's much less useful. It's distracting to the reader of the code to be constantly informed "this binding is not mutated" 4/

      2 replies 1 retweet 12 likes
    9. David S Herm-kins‏ @littlecalculist 10 Oct 2017
      Replying to @littlecalculist @theomn @wycats

      Worse, it's confusing people because it's not telling you the value is immutable, just the binding. 5/

      2 replies 3 retweets 10 likes
    10. use std::mem::transmute;‏ @theomn 10 Oct 2017
      Replying to @littlecalculist @wycats

      I feel like your point is strong, but I've never known a dev to miss the distinction between mutable vs const name binding.

      1 reply 0 retweets 1 like
      Yehuda Katz  🥨‏Verified account @wycats 10 Oct 2017
      Replying to @theomn @littlecalculist

      1: The point of const to me is to let the user know that the original author INTENDED it to be immutable.

      4:59 PM - 10 Oct 2017
      2 replies 0 retweets 0 likes
        1. New conversation
        2. Yehuda Katz  🥨‏Verified account @wycats 10 Oct 2017
          Replying to @wycats @theomn @littlecalculist

          2: By saying "always use const and change it whenever it happens to be mutated", you're losing an important signal:

          1 reply 0 retweets 0 likes
        3. Yehuda Katz  🥨‏Verified account @wycats 10 Oct 2017
          Replying to @wycats @theomn @littlecalculist

          3: That the original author considered it questionable to mutate the variable.

          1 reply 0 retweets 0 likes
        4. Yehuda Katz  🥨‏Verified account @wycats 10 Oct 2017
          Replying to @wycats @theomn @littlecalculist

          4: And what are we gaining? In exchange for losing user intent, we gain a minor but noisy piece of metadata ...

          1 reply 0 retweets 0 likes
        5. Yehuda Katz  🥨‏Verified account @wycats 10 Oct 2017
          Replying to @wycats @theomn @littlecalculist

          5: that is trivial to see by scanning the code (is it mutated is the same as "is there an x= somewhere in the function?")

          1 reply 0 retweets 0 likes
        6. Yehuda Katz  🥨‏Verified account @wycats 10 Oct 2017
          Replying to @wycats @theomn @littlecalculist

          6: If your functions are too large for it to be quickly analyzable, consider smaller functions.

          1 reply 0 retweets 0 likes
        7. Yehuda Katz  🥨‏Verified account @wycats 10 Oct 2017
          Replying to @wycats @theomn @littlecalculist

          7/7: Your code will be clearer and you won't have given up an important source of user intent.

          1 reply 0 retweets 0 likes
        8. Patrick Walton‏ @pcwalton 10 Oct 2017
          Replying to @wycats @theomn @littlecalculist

          I’m guilty of using “const” everywhere I can out of habit, but I doubt it has really ever prevented a bug.

          1 reply 0 retweets 2 likes
        9. Yehuda Katz  🥨‏Verified account @wycats 10 Oct 2017
          Replying to @pcwalton @theomn @littlecalculist

          It also devalues the meaning of const when you wrote it for a reason ("don't change this module-level variable plz")

          1 reply 0 retweets 0 likes
        10. 3 more replies
        1. New conversation
        2. Nasal Demon‏ @ubsanitizer 10 Oct 2017
          Replying to @wycats @theomn @littlecalculist

          I thought you were talking about C++ for the entire thread and I was *extremely* confused :P

          1 reply 0 retweets 2 likes
        3. Yehuda Katz  🥨‏Verified account @wycats 10 Oct 2017
          Replying to @ubsanitizer @theomn @littlecalculist

          Haha. The story is different in rust :)

          0 replies 0 retweets 0 likes
        4. End of conversation

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