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wycats's profile
Yehuda Katz 🥨
Yehuda Katz 🥨
Yehuda Katz  🥨
Verified account
@wycats

Tweets

Yehuda Katz  🥨Verified account

@wycats

Tilde Co-Founder, OSS enthusiast and world traveler.

Portland, OR
yehudakatz.com
Joined August 2007

Tweets

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    1. Sebastian Markbåge‏ @sebmarkbage 31 Oct 2017
      Replying to @BrandonBloom @samth

      Can it type check the function body of `f` correctly?

      1 reply 0 retweets 0 likes
    2. Brandon Bloom‏ @BrandonBloom 31 Oct 2017
      Replying to @sebmarkbage @samth

      Nope: http://www.typescriptlang.org/play/index.html#src=function%20f(x%3A%20string)%3A%20string%3B%0D%0Afunction%20f(x%3A%20boolean)%3A%20boolean%3B%0D%0Afunction%20f(x)%20%7B%20return%20x%20%3D%3D%3D%20'string'%20%3F%20'yes'%20%3A%20false%3B%20%7D%0D%0Alet%20y%3A%20string%20%3D%20f('hey')%3B …

      1 reply 0 retweets 0 likes
    3. Sam Tobin-Hochstadt‏ @samth 31 Oct 2017
      Replying to @BrandonBloom @sebmarkbage

      That function has an actual type error (you forgot the `typeof`) but modified versions seem to work for me.

      2 replies 0 retweets 0 likes
    4. Brandon Bloom‏ @BrandonBloom 31 Oct 2017
      Replying to @samth @sebmarkbage

      You're right I forgot the typeof, but with the typeof I still get the same error. What did you modify it to?

      1 reply 0 retweets 0 likes
    5. Yehuda Katz  🥨‏Verified account @wycats 31 Oct 2017
      Replying to @BrandonBloom @samth @sebmarkbage

      this works, and is actually what you wantpic.twitter.com/6KP0ifV4eU

      1 reply 0 retweets 0 likes
    6. Brandon Bloom‏ @BrandonBloom 31 Oct 2017
      Replying to @wycats @samth @sebmarkbage

      That has the same problem as the other three solutions people gave me for my overly simplified tweet-sized example: ...

      1 reply 0 retweets 0 likes
    7. Brandon Bloom‏ @BrandonBloom 31 Oct 2017
      Replying to @BrandonBloom @wycats and

      What about when the input and output types are not the same?

      2 replies 0 retweets 0 likes
    8. Brandon Bloom‏ @BrandonBloom 31 Oct 2017
      Replying to @BrandonBloom @wycats and

      Never mind that this is far beyond the verbosity threshold when there are a non-trivial number of overloads.

      1 reply 0 retweets 0 likes
    9. Yehuda Katz  🥨‏Verified account @wycats 31 Oct 2017
      Replying to @BrandonBloom @samth @sebmarkbage

      The specific problem you're trying to solve is "output is the same as some input"?

      1 reply 0 retweets 0 likes
    10. Brandon Bloom‏ @BrandonBloom 31 Oct 2017
      Replying to @wycats @samth @sebmarkbage

      Brandon Bloom Retweeted Brandon Bloom

      https://twitter.com/BrandonBloom/status/925505166974918656 … Let me see if I can find a reasonable toy example.

      Brandon Bloom added,

      Brandon Bloom @BrandonBloom
      Replying to @BrandonBloom @skevy and 3 others
      Here, try this one: let f = (x) => ({string: true, boolean: 'blah'}[typeof x]); It's contrived, but it's closer to my actual use case.
      1 reply 0 retweets 0 likes
      Yehuda Katz  🥨‏Verified account @wycats 31 Oct 2017
      Replying to @BrandonBloom @samth @sebmarkbage

      How's this:pic.twitter.com/jubmske97G

      4:42 PM - 31 Oct 2017
      • 1 Like
      • ElephantLaboratories
      1 reply 0 retweets 1 like
        1. New conversation
        2. Brandon Bloom‏ @BrandonBloom 31 Oct 2017
          Replying to @wycats @samth @sebmarkbage

          Ah, is this what you meant by "mapping interface"? This is a clever trick.

          1 reply 0 retweets 0 likes
        3. Adam Miskiewicz‏ @skevy 31 Oct 2017
          Replying to @BrandonBloom @wycats and

          Yah I was going to recommend the same thing with Flow https://flow.org/try/#0C4TwDgpgBAShwFcBOA7AsgQzFAvFA3gFBRQBEAzsEgJYoDmpAXFAEYD2bANhBigDTEy7LjxRMolGvQEBfANyFC3YFABmuKAB4AKs0m06APgAUAD2baAlMwAkAUW4BbCCmDbwETXESpMYPlDahrjB+DKKylAAbhicGqrGAOTC3LyJlgqExjGcelQGlkA … (assumed TS had something similar)...

          1 reply 0 retweets 2 likes
        4. Adam Miskiewicz‏ @skevy 31 Oct 2017
          Replying to @skevy @BrandonBloom and

          Unfortunately the keys need to be strings, I think.

          1 reply 0 retweets 0 likes
        5. Yehuda Katz  🥨‏Verified account @wycats 31 Oct 2017
          Replying to @skevy @BrandonBloom and

          Here's a more fleshed out and generalized version of the same trickpic.twitter.com/QYtDTtuzZv

          1 reply 0 retweets 3 likes
        6. Brandon Bloom‏ @BrandonBloom 31 Oct 2017
          Replying to @wycats @skevy and

          I'm not sure how to react to this. On one hand, this is an impressive solution. On the other hand, this is just needlessly complex.

          1 reply 0 retweets 4 likes
        7. Yehuda Katz  🥨‏Verified account @wycats 31 Oct 2017
          Replying to @BrandonBloom @skevy and

          Were you just looking to grouse and annoyed that I got in the way? ;)

          2 replies 0 retweets 1 like
        8. Brandon Bloom‏ @BrandonBloom 31 Oct 2017
          Replying to @wycats @skevy and

          Heh, I'm actively trying to decide if I want to employ that solution or if I'd rather just use some casts. Leaning towards latter.

          2 replies 0 retweets 1 like
        9. Brandon Bloom‏ @BrandonBloom 31 Oct 2017
          Replying to @BrandonBloom @wycats and

          Especially since with the casts in there right now, my tests are passing! :-P

          0 replies 0 retweets 0 likes
        10. End of conversation

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