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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. 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.

      2 replies 0 retweets 0 likes
    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. Yehuda Katz  🥨‏Verified account @wycats 10 Oct 2017
      Replying to @wycats @pcwalton and

      In rust that kind of change is a public API-breaking change so people are more intentional about it.

      1 reply 0 retweets 0 likes
      Yehuda Katz  🥨‏Verified account @wycats 10 Oct 2017
      Replying to @wycats @pcwalton and

      I really want const to mean "the author thought this variable shouldn't be mutated" not "it happened to not be mutated".

      5:32 PM - 10 Oct 2017
      • 1 Like
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      1 reply 0 retweets 1 like
        1. Yehuda Katz  🥨‏Verified account @wycats 10 Oct 2017
          Replying to @wycats @pcwalton and

          I can tell the latter by looking at the code. The former is lost forever.

          0 replies 0 retweets 0 likes
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