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richhickey's profile
Rich Hickey
Rich Hickey
Rich Hickey
@richhickey

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Rich Hickey

@richhickey

clojure.org
Joined June 2009

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    1. Rich Hickey‏ @richhickey 7 Sep 2018
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      Not having a thing is not the same as having an empty maybe-thing

      24 replies 91 retweets 364 likes
    2. Daniel Spiewak‏ @djspiewak 7 Sep 2018
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      Replying to @richhickey

      The negative hypothesis is always untestable. Rather than attempting to reason about absence directly, it is more useful to encode it in an explicit form.

      1 reply 0 retweets 8 likes
      Rich Hickey‏ @richhickey 7 Sep 2018
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      Replying to @djspiewak

      Huh. I don't think my driver's license has my phone number on it ... checks ... that's right, it doesn't.

      8:28 AM - 7 Sep 2018
      • 15 Likes
      • Célio Cidral Jr mage2.tv Alan Forrester Jacob Matthews Sam King Pra v4 ~ (05 / 12) Maksym Dmitri ☭
      3 replies 0 retweets 15 likes
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        2. Daniel Spiewak‏ @djspiewak 7 Sep 2018
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          Replying to @richhickey

          That seems like a rather imprecise phrasing. Let's make it more concrete: write a pure function which produces your phone number given a driver's license. What does it return?

          2 replies 0 retweets 0 likes
        3. Rich Hickey‏ @richhickey 7 Sep 2018
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          Replying to @djspiewak

          In the real world we can trivially ask and answer the question - Does your driver's license have a phone number on it? Also the question - what information does your driver's license have on it?

          3 replies 0 retweets 3 likes
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        2. Stewart · Stewart‏ @stewSqrd 7 Sep 2018
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          Replying to @richhickey @djspiewak

          But is that because you didn't provide a phone number or does no one expect to see a phone number on your driver's license in the first place?

          1 reply 0 retweets 0 likes
        3. Rich Hickey‏ @richhickey 7 Sep 2018
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          Replying to @stewSqrd @djspiewak

          How can I know what people might expect?

          1 reply 0 retweets 1 like
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        1. David Kormushoff‏ @Kormie 7 Sep 2018
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          Replying to @richhickey @djspiewak

          Aren’t you saying that until you actually inspected your license though that it might have a number on it? You’re hedging your bet and acknowledging the uncertainty of its presence. I thought that was the important thing.

          0 replies 0 retweets 0 likes
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