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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. Ryan Florence‏ @ryanflorence 5 Oct 2016

      w/ const, at least we can say "it's not reassigned, not sure about mutations though". With let, you know neither. Seems uncontroversial 😕

      7 replies 6 retweets 31 likes
    2. Ryan Florence‏ @ryanflorence 5 Oct 2016
      Replying to @ryanflorence

      Only problem is people thinking it can't be mutated and then get surprised, but everything you don't know can surprise you.

      4 replies 1 retweet 17 likes
      Yehuda Katz  🥨‏Verified account @wycats 5 Oct 2016
      Replying to @ryanflorence

      one problem is that function parameters can't be declared const, but const-first code styles don't remind you they're mutable

      6:33 PM - 5 Oct 2016
      • 2 Retweets
      • 11 Likes
      • William P Riley-Land Michiel Dral Hycner Jack Dario Gieselaar Christian Pekeler Yaniv Tal 1000 years of COBOL Parker Bond
      4 replies 2 retweets 11 likes
        1. New conversation
        2. Ryan Florence‏ @ryanflorence 5 Oct 2016
          Replying to @wycats

          which makes the scoping guarantees of either a problem too! Back to var I guess.

          1 reply 0 retweets 0 likes
        3. Yehuda Katz  🥨‏Verified account @wycats 5 Oct 2016
          Replying to @ryanflorence

          I just use let except for module-wide constants and keep my functions small ;)

          1 reply 0 retweets 12 likes
        4. Ryan Florence‏ @ryanflorence 5 Oct 2016
          Replying to @wycats

          why use let then? same problem with params

          2 replies 0 retweets 0 likes
        5. Yehuda Katz  🥨‏Verified account @wycats 5 Oct 2016
          Replying to @ryanflorence

          the reason I don't find "it's uncontroversial" persuasive is that two ways to declare variables instead of one isn't free

          1 reply 0 retweets 3 likes
        6. Yehuda Katz  🥨‏Verified account @wycats 5 Oct 2016
          Replying to @wycats @ryanflorence

          it means I'm thinking about it all the time, and keeping it in mind isn't free. In small methods, the benefits are ~0 for me

          1 reply 0 retweets 4 likes
        7. Ryan Florence‏ @ryanflorence 5 Oct 2016
          Replying to @wycats

          methinks you've made a `let` believe out of me 🤔 Or at the very least, I'm completely without opinion on the matter now.

          2 replies 0 retweets 6 likes
        8. Yehuda Katz  🥨‏Verified account @wycats 5 Oct 2016
          Replying to @ryanflorence

          yay! I don't really ultimately care what individual projects choose, but I don't want people to believe it's a no-brainer :)

          2 replies 1 retweet 1 like
        9. Ryan Florence‏ @ryanflorence 5 Oct 2016
          Replying to @wycats

          it reminds me of coffeescript param shadowing gotchas now

          0 replies 0 retweets 0 likes
        10. End of conversation
        1. New conversation
        2. JeffMo‏ @lbljeffmo 5 Oct 2016
          Replying to @wycats

          I've always wanted const params! (Haven't had time to put any kind of proposal together though). @ryanflorence

          1 reply 0 retweets 2 likes
        3. JeffMo‏ @lbljeffmo 5 Oct 2016
          Replying to @lbljeffmo @wycats

          there's an experimental flag in Flow to turn all params const. Turning it on for new projects is nice @ryanflorence

          2 replies 1 retweet 3 likes
        4. JeffMo‏ @lbljeffmo 5 Oct 2016
          Replying to @lbljeffmo @wycats

          don't think implicit const could fly in JS though @ryanflorence

          1 reply 0 retweets 0 likes
        5. BrendanEich‏Verified account @BrendanEich 5 Oct 2016
          Replying to @lbljeffmo @wycats @ryanflorence

          obviously backward incompatible; nicer than const all over: shorter notation, say (=x, =y) => A*x + B*y + C

          1 reply 0 retweets 2 likes
        6. BrendanEich‏Verified account @BrendanEich 5 Oct 2016
          Replying to @BrendanEich @lbljeffmo and

          shorter example not as well-motivated as longer, ofc!

          1 reply 0 retweets 0 likes
        7. Yehuda Katz  🥨‏Verified account @wycats 5 Oct 2016
          Replying to @BrendanEich @lbljeffmo @ryanflorence

          people are already willing to use `const`, two more chars than `let` -- usage in params may be ok

          2 replies 0 retweets 1 like
        8. BrendanEich‏Verified account @BrendanEich 5 Oct 2016
          Replying to @wycats @lbljeffmo @ryanflorence

          people are hostage to mutable default binding spec which cannot change -- suggests better path, esp for =>.

          1 reply 0 retweets 0 likes
        9. Domenic Denicola‏ @domenic 5 Oct 2016
          Replying to @BrendanEich @wycats and

          I remember in my earliest TC39 days asking if new function forms could be const params

          1 reply 0 retweets 4 likes
        10. 12 more replies
        1. Yehuda Katz  🥨‏Verified account @wycats 5 Oct 2016
          Replying to @wycats @ryanflorence

          I've been in a const-first codebase for a couple months and had this fool me (with bad results) more times than const saved me

          0 replies 0 retweets 4 likes
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        1. Yehuda Katz  🥨‏Verified account @wycats 5 Oct 2016
          Replying to @wycats @ryanflorence

          notable: in rust the `mut` annotation is available on function parameters.

          0 replies 0 retweets 0 likes
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