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edwinbrady's profile
Edwin Brady
Edwin Brady
Edwin Brady
@edwinbrady

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Edwin Brady

@edwinbrady

CompSci Lecturer. Go player. Programming language researcher. Idris hacker. Denies knowledge of Whitespace. He/him. http://tinyurl.com/TypeDD 

St Andrews
eb.host.cs.st-andrews.ac.uk
Joined November 2008

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    1. Hillel‏ @hillelogram 21 Nov 2018
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      "A unison program describes an entire distributed system. It includes deployment, scaling, failover, [etc]." You write one program for the whole system and deploy that system by running that program.

      1 reply 1 retweet 0 likes
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    2. Hillel‏ @hillelogram 21 Nov 2018
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      mapReduce has output `{Remote} b`. The `Remote` is an ability, or an effect system, tracked in the types. Unison can transfer an arbitrary computation to a remote node.

      1 reply 0 retweets 1 like
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    3. Hillel‏ @hillelogram 21 Nov 2018
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      We have a primitive `at`: `http://Remote.at  location AST` The code is sent to another node. (Sounds dangerous re security, we'll find out.)

      2 replies 0 retweets 0 likes
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    4. Hillel‏ @hillelogram 21 Nov 2018
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      Functions/types are internally represented as hashes of their implementation. So two things with the same implementation can have different names- makes serialization easy. It also means that you can casually rename stuff no problem- they're interchangeable.

      2 replies 0 retweets 3 likes
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    5. Hillel‏ @hillelogram 21 Nov 2018
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      The Unison codebase is an immutable data structure. "If you compile code, you never have to recompile it again- it's around forever." (Memory issues an issue? Hash collisions a thing?)

      2 replies 0 retweets 1 like
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    6. Hillel‏ @hillelogram 21 Nov 2018
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      Dependency hell is vastly reduced in Unison. (wait: if you change the name, and THEN the implementation, will the other code be pointing at the old name?)

      2 replies 0 retweets 0 likes
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    7. Hillel‏ @hillelogram 21 Nov 2018
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      Instead of libraries, your program depends on hashes. So if two libraries depend on the same dependency, but different hashes, no problem. (Seems like this would have problems with security updates)

      3 replies 0 retweets 0 likes
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    8. Hillel‏ @hillelogram 21 Nov 2018
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      Type system stuff: It's crazy we're in TYOOL 2018 and error messages are bad. Let's take a page from elm and have the error explain the problem to you! For example: saying "All the types in this case match output should be the same, but they're not."

      1 reply 0 retweets 2 likes
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    9. Hillel‏ @hillelogram 21 Nov 2018
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      "This looks like a function call, but with Text where an operator should be. Are you missing an operator?" (This seems like it has potential to get really unhelpful if you're working off the beaten path)

      1 reply 0 retweets 2 likes
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    10. Hillel‏ @hillelogram 21 Nov 2018
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      (Why don't most new languages have structured compiler error output?) Seems like it would be incredibly useful.)

      3 replies 0 retweets 7 likes
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      Edwin Brady‏ @edwinbrady 21 Nov 2018
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      Replying to @hillelogram @runarorama

      We have error reflection in Idris; you can match on errors and rewrite them to be more informative if you know more of the domain. It's really useful, if tricky to use well at the moment...

      7:02 AM - 21 Nov 2018
      • 7 Likes
      • Sebastian Ullrich Rúnar er heima Matt Diephouse Simon Van Casteren Vilem might have Hillel Matt Parsons 🏳️‍🌈
      0 replies 0 retweets 7 likes

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