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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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    Yehuda Katz  🥨‏Verified account @wycats 29 May 2015

    Can someone please explain to me what bug people think they are catching by choosing `const` in ES6 programs over `let`?

    8:34 PM - 29 May 2015
    • 16 Retweets
    • 24 Likes
    • Fiz 🌾 Allison Clift-Jennings Simon Knox Howard Tony Jessup Jordan Schroter Jacek Dargiel Tony Schneider Roman Liutikov
    17 replies 16 retweets 24 likes
      1. New conversation
      2. Keith Horwood‏ @keithwhor 29 May 2015
        Replying to @wycats

        @wycats explicit, easy to reason about. Can give V8 a better idea about potential optimizations

        2 replies 0 retweets 1 like
      3. Yehuda Katz  🥨‏Verified account @wycats 29 May 2015
        Replying to @keithwhor

        @keithwhor in what way is let harder to reason about?

        2 replies 0 retweets 0 likes
      4. Keith Horwood‏ @keithwhor 29 May 2015
        Replying to @wycats

        @wycats It's harder to reason about what the developer's intentions for the variable are. When you see const you know what you're getting...

        1 reply 0 retweets 2 likes
      5. Yehuda Katz  🥨‏Verified account @wycats 29 May 2015
        Replying to @keithwhor

        @keithwhor the developer's intention is related to whether they mutate the variable. Are you writing 100+ line functions?

        0 replies 0 retweets 1 like
      6. End of conversation
      1. New conversation
      2. Mister Speaker‏ @mrspeaker 29 May 2015
        Replying to @wycats

        @wycats it’s just more accurately describing your intention. But damn it, 5 characters vs 3!

        2 replies 0 retweets 1 like
      3. Yehuda Katz  🥨‏Verified account @wycats 29 May 2015
        Replying to @mrspeaker

        @mrspeaker so the worry is that you might later on forget that you *really meant* constant and mutate the binding?

        2 replies 0 retweets 0 likes
      4. Yehuda Katz  🥨‏Verified account @wycats 29 May 2015
        Replying to @wycats

        @mrspeaker Remember that `let x = 1; let x = 2;` is an error.

        2 replies 0 retweets 0 likes
      5. Balint Erdi‏ @baaz 30 May 2015
        Replying to @wycats

        @wycats Yes, but `let x=1; x=2;` is not an error while with const it is. If I don't want x to ever change, I use `const` /cc @mrspeaker

        0 replies 0 retweets 2 likes
      6. End of conversation
      1. New conversation
      2. Sam Goldman‏ @nontrivialzeros 29 May 2015
        Replying to @wycats

        @wycats lots of opportunities for better static analysis in flow

        1 reply 0 retweets 0 likes
      3. Yehuda Katz  🥨‏Verified account @wycats 29 May 2015
        Replying to @nontrivialzeros

        @nontrivialzeros why is flow able to do better static analysis if you type const vs typing let and not mutating? /cc @lbljeffmo

        3 replies 0 retweets 0 likes
      4. Sam Goldman‏ @nontrivialzeros 29 May 2015
        Replying to @wycats

        @wycats @lbljeffmo Can only implement this with consthttps://github.com/facebook/flow/pull/318#issuecomment-79318314 …

        1 reply 0 retweets 1 like
      5. Yehuda Katz  🥨‏Verified account @wycats 29 May 2015
        Replying to @nontrivialzeros

        @nontrivialzeros @lbljeffmo why would flow differentiate between a variable declared const and a variable that was never reassigned?

        0 replies 0 retweets 0 likes
      6. End of conversation
      1. New conversation
      2. 1000 years of COBOL‏ @modernserf 29 May 2015
        Replying to @wycats

        @wycats I kind of wish const prevented shadowing, since that's my more common reassignment screwup vs in the same scope

        1 reply 0 retweets 0 likes
      3. Yehuda Katz  🥨‏Verified account @wycats 29 May 2015
        Replying to @modernserf

        @modernserf in the same scope, `let` protects you unless you write `x = 1` which isn't the mistake you're ACTUALLY going to make.

        0 replies 0 retweets 0 likes
      4. End of conversation
      1. New conversation
      2. Spooky Unicorn‏ @ialexi 29 May 2015
        Replying to @wycats

        @wycats the bug of being impossible for the compiler to entirely optimize out.

        1 reply 0 retweets 2 likes
      3. Yehuda Katz  🥨‏Verified account @wycats 29 May 2015
        Replying to @ialexi

        @ialexi why is the compiler worse at optimizing let bindings that are never reassigned than const bindings

        5 replies 0 retweets 0 likes
      4. Spooky Unicorn‏ @ialexi 29 May 2015
        Replying to @wycats

        @wycats it should be possible to statically analyze let and optimize it out, but if there is any single eval-like call it breaks.

        0 replies 0 retweets 1 like
      5. End of conversation
      1. New conversation
      2. Marc Brooks‏ @IDisposable 29 May 2015
        Replying to @wycats

        @wycats Tis not a bug, tis a JIT optimization hint.

        1 reply 0 retweets 0 likes
      3. Yehuda Katz  🥨‏Verified account @wycats 29 May 2015
        Replying to @IDisposable

        @IDisposable I don't like talking to my JIT, and even naive JITs can identify `let`s whose binding is never mutated.

        1 reply 0 retweets 0 likes
      4. Marc Brooks‏ @IDisposable 29 May 2015
        Replying to @wycats

        @wycats never is a very broad brush, oft beyond the veil of a simple JIT

        0 replies 0 retweets 0 likes
      5. End of conversation

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