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TimSweeneyEpic's profile
Tim Sweeney
Tim Sweeney
Tim Sweeney
@TimSweeneyEpic

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Tim Sweeney

@TimSweeneyEpic

Epic Games founder & CEO

epicgames.com
Joined August 2013

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    Tim Sweeney‏ @TimSweeneyEpic 1 Jan 2018
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    So, how about "[x,y) x+y" syntax for lambdas? With Typescript syntax: map(xs,[x:int)x+1) With C syntax: map(xs,[int x)x+1) Pleasantly concise versus (x,y)=>x+1, or too strange?

    2:40 PM - 1 Jan 2018
    • 4 Retweets
    • 21 Likes
    • Achiko Mezvrishvili KarimAmr Питомец JJ A Mysterious stranger; no, not that one juan sedano @home Indy Garcia Costantino Pistagna Andrea
    23 replies 4 retweets 21 likes
      1. New conversation
      2. nicebyte‏ @nice_byte 1 Jan 2018
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        Replying to @TimSweeneyEpic

        The asymmetry between [ and ) bothers me way more than it should

        2 replies 0 retweets 8 likes
      3. Tim Sweeney‏ @TimSweeneyEpic 1 Jan 2018
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        Replying to @nice_byte

        Haskell \lambda-> and Rust |lambda| are sound unless the language is such that higher-order functions are expressed by nesting these constructs.

        1 reply 0 retweets 0 likes
      4. 1 more reply
      1. New conversation
      2. Nathan Reed‏ @Reedbeta 1 Jan 2018
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        Replying to @TimSweeneyEpic

        It looks like a half-open interval?? My first reaction is "too strange".

        1 reply 0 retweets 10 likes
      3. Tom Forsyth‏ @tom_forsyth 1 Jan 2018
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        Replying to @Reedbeta @TimSweeneyEpic

        Agreed. Reading over writing please. Do the extra two characters really slow you down that much?

        1 reply 0 retweets 2 likes
      4. 1 more reply
      1. Simon Cooke‏ @FleetingShadow 1 Jan 2018
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        Replying to @TimSweeneyEpic

        The unbalanced braces hurt my ability to speed read it. Too many years spent seeing balanced braces of all kinds everywhere.

        0 replies 0 retweets 7 likes
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      1. BrendanEich‏Verified account @BrendanEich 1 Jan 2018
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        Replying to @TimSweeneyEpic

        Looks like a half-open range running into another expression. Mismatched bracketing chars = painful in yet-unaware editors & prettyprinters.

        0 replies 0 retweets 8 likes
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      1. New conversation
      2. Compulsive Dabbler‏ @ashwinsudhir 1 Jan 2018
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        Replying to @TimSweeneyEpic

        Brain tries to eagerly match the ) in [x,y) to the last open ( like the one in "map(" Editor tooling to jump to matching bracket will need re-work too

        1 reply 0 retweets 5 likes
      3. Hernan Soulages  🤔 📊‏ @elacuariano_ar 1 Jan 2018
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        Replying to @ashwinsudhir @TimSweeneyEpic

        Not only brain. Syntax highlighters become quite complicated if paring is no longer possible

        0 replies 0 retweets 0 likes
      4. End of conversation
      1. New conversation
      2. Rik Arends‏ @rikarends 1 Jan 2018
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        Replying to @TimSweeneyEpic

        Low state syntax highlighters would really not like it, especially not since a 'default arg' in TS can be arbitrary expressions. Also typos that turn into lambdas and spewing errors that the writer may find hard to parse.

        1 reply 0 retweets 2 likes
      3. Rik Arends‏ @rikarends 1 Jan 2018
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        Replying to @rikarends @TimSweeneyEpic

        But as a general rule anything thats a consistent parse error can also be turned into syntax so i don't see why it couldn't be parsed.

        0 replies 0 retweets 0 likes
      4. End of conversation

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