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propensive's profile
Jon Pretty
Jon Pretty
Jon Pretty
@propensive

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Jon Pretty

@propensive

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

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propensive.com
Joined July 2010

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    1. Jon Pretty‏ @propensive 28 Mar 2018

      Shadowing in Scala's for-comprehensions is a nice feature. It has the feel of mutability, but safer, and shadowing's almost always what you want. for { x <- Try(doSomething) x <- mightFail(x) x <- returnTry(x) } yield x Unfortunately it only works with flatMaps, not maps.

      2 replies 7 retweets 36 likes
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    2. Jon Pretty‏ @propensive 28 Mar 2018

      So you can't write, for { x <- Try(doSomething) x = someValue } yield x We can rewrite that as, for { x <- Try(doSomething) x <- Success(someValue) } yield x but it's a shame we need to.

      2 replies 3 retweets 7 likes
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    4. Jon Pretty‏ @propensive 28 Mar 2018
      Replying to @prezcannady

      It has to wrap the value unnecessarily, so there's a gap allocation, plus the wrappers seem like syntactic noise to me...

      2 replies 0 retweets 0 likes
      Jon Pretty‏ @propensive 28 Mar 2018
      Replying to @propensive @prezcannady

      s/gap/heap/

      7:34 AM - 28 Mar 2018 from East Worldham, England
      0 replies 0 retweets 0 likes

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