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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. Dave Herman‏ @littlecalculist 10 Oct 2017
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      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 13 likes
    2. Dave Herman‏ @littlecalculist 10 Oct 2017
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      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 13 likes
    3. Owen Nelson‏ @theomn 10 Oct 2017
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      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
    4. Yehuda Katz  🥨‏Verified account @wycats 10 Oct 2017
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      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
    5. Yehuda Katz  🥨‏Verified account @wycats 10 Oct 2017
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      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
    6. Yehuda Katz  🥨‏Verified account @wycats 10 Oct 2017
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      Replying to @wycats @theomn @littlecalculist

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

      1 reply 0 retweets 0 likes
    7. Yehuda Katz  🥨‏Verified account @wycats 10 Oct 2017
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      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
    8. Yehuda Katz  🥨‏Verified account @wycats 10 Oct 2017
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      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
    9. Yehuda Katz  🥨‏Verified account @wycats 10 Oct 2017
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      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
    10. Yehuda Katz  🥨‏Verified account @wycats 10 Oct 2017
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      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
      Patrick Walton‏ @pcwalton 10 Oct 2017
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      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.

      5:11 PM - 10 Oct 2017
      • 2 Likes
      • Jarek Radosz Yehuda Katz 🥨
      1 reply 0 retweets 2 likes
        1. New conversation
        2. Yehuda Katz  🥨‏Verified account @wycats 10 Oct 2017
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          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
        3. Yehuda Katz  🥨‏Verified account @wycats 10 Oct 2017
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          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
        4. 2 more replies

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