Skip to content
  • Home Home Home, current page.
  • Moments Moments Moments, current page.

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @
  • Language: English
    • Bahasa Indonesia
    • Bahasa Melayu
    • Català
    • Čeština
    • Dansk
    • Deutsch
    • English UK
    • Español
    • Filipino
    • Français
    • Hrvatski
    • Italiano
    • Magyar
    • Nederlands
    • Norsk
    • Polski
    • Português
    • Română
    • Slovenčina
    • Suomi
    • Svenska
    • Tiếng Việt
    • Türkçe
    • Ελληνικά
    • Български език
    • Русский
    • Српски
    • Українська мова
    • עִבְרִית
    • العربية
    • فارسی
    • मराठी
    • हिन्दी
    • বাংলা
    • ગુજરાતી
    • தமிழ்
    • ಕನ್ನಡ
    • ภาษาไทย
    • 한국어
    • 日本語
    • 简体中文
    • 繁體中文
  • Have an account? Log in
    Have an account?
    · Forgot password?
    New to Twitter?
    Sign up
propensive's profile
Jon Pretty
Jon Pretty
Jon Pretty
@propensive

Tweets

Jon Pretty

@propensive

Supporting Scala through professional training and open-source software. Responsible for Magnolia, Fury, Scala World and Functional Africa.

Europe
propensive.com
Joined July 2010

Tweets

  • © 2021 Twitter
  • About
  • Help Center
  • Terms
  • Privacy policy
  • Cookies
  • Ads info
Dismiss
Previous
Next

Go to a person's profile

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @

Promote this Tweet

Block

  • Tweet with a location

    You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more

    Your lists

    Create a new list

    Under 100 characters, optional
    Privacy

    Copy link to Tweet

    Embed this Tweet

    Embed this Video

    Add this Tweet to your website by copying the code below. Learn more

    Add this video to your website by copying the code below. Learn more

    Hmm, there was a problem reaching the server.

    By embedding Twitter content in your website or app, you are agreeing to the Twitter Developer Agreement and Developer Policy.

    Preview

    Why you're seeing this ad

    Log in to Twitter

    · Forgot password?
    Don't have an account? Sign up »

    Sign up for Twitter

    Not on Twitter? Sign up, tune into the things you care about, and get updates as they happen.

    Sign up
    Have an account? Log in »

    Two-way (sending and receiving) short codes:

    Country Code For customers of
    United States 40404 (any)
    Canada 21212 (any)
    United Kingdom 86444 Vodafone, Orange, 3, O2
    Brazil 40404 Nextel, TIM
    Haiti 40404 Digicel, Voila
    Ireland 51210 Vodafone, O2
    India 53000 Bharti Airtel, Videocon, Reliance
    Indonesia 89887 AXIS, 3, Telkomsel, Indosat, XL Axiata
    Italy 4880804 Wind
    3424486444 Vodafone
    » See SMS short codes for other countries

    Confirmation

     

    Welcome home!

    This timeline is where you’ll spend most of your time, getting instant updates about what matters to you.

    Tweets not working for you?

    Hover over the profile pic and click the Following button to unfollow any account.

    Say a lot with a little

    When you see a Tweet you love, tap the heart — it lets the person who wrote it know you shared the love.

    Spread the word

    The fastest way to share someone else’s Tweet with your followers is with a Retweet. Tap the icon to send it instantly.

    Join the conversation

    Add your thoughts about any Tweet with a Reply. Find a topic you’re passionate about, and jump right in.

    Learn the latest

    Get instant insight into what people are talking about now.

    Get more of what you love

    Follow more accounts to get instant updates about topics you care about.

    Find what's happening

    See the latest conversations about any topic instantly.

    Never miss a Moment

    Catch up instantly on the best stories happening as they unfold.

    1. Dale Wijnand‏ @dwijnand 7 Nov 2019

      TIL Option[_] isn't a higher-kinded type. It's just a type constructor. Higher-kinded types are types that abstract over type constructors (so X[F[_]]). As known as 1st order & higher-order abstraction. But best refer to the latter as "type constructor polymorphism".

      5 replies 2 retweets 48 likes
    2. Jon Pretty‏ @propensive 7 Nov 2019
      Replying to @dwijnand

      There isn't any consistency with what people mean when they say "HKT" these days. By most usages, type constructors *are* HKTs. Though, the way you've written it ("Option[_]") is actually just a proper type with kind *, albeit existential. "Option" would be the TC.

      3 replies 0 retweets 5 likes
    3. Dale Wijnand‏ @dwijnand 7 Nov 2019
      Replying to @propensive

      OK, s/Option[_]/Option/ then. But the problem I had with using "Option" is it's also what the companion object (term) is...

      1 reply 0 retweets 0 likes
    4. Jon Pretty‏ @propensive 7 Nov 2019
      Replying to @dwijnand

      Yep, Scala cheats away this ambiguity with context-aware syntax. I'm not sure how best to express the intent of Option *as a type* in prose.

      1 reply 0 retweets 1 like
    5. Tamer Abdulradi‏ @tabdulradi 7 Nov 2019
      Replying to @propensive @dwijnand

      `Option[?]` ? 🤔

      1 reply 0 retweets 3 likes
    6. Jon Pretty‏ @propensive 7 Nov 2019
      Replying to @tabdulradi @dwijnand

      That's so 2021. ;)

      1 reply 0 retweets 1 like
    7. Dale Wijnand‏ @dwijnand 7 Nov 2019
      Replying to @propensive @tabdulradi

      `Option[🤔]`

      1 reply 0 retweets 5 likes
      Jon Pretty‏ @propensive 7 Nov 2019
      Replying to @dwijnand @tabdulradi

      Scala 4. Write a SIP.

      4:24 PM - 7 Nov 2019
      • 2 Likes
      • François Armand Dale Wijnand
      0 replies 0 retweets 2 likes

      Loading seems to be taking a while.

      Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.

        Promoted Tweet

        false

        • © 2021 Twitter
        • About
        • Help Center
        • Terms
        • Privacy policy
        • Cookies
        • Ads info