On Mar 30, 2008, at 10:58 AM, Jason Orendorff wrote: > On Fri, Mar 28, 2008 at 10:32 PM, Brendan Eich > <[EMAIL PROTECTED]> wrote: >> This is a long-ish case for including generators in ES4 as proposed. >> [...] > > Here's a brief case: generators let you factor a complex loop, > dividing the value-producing part from the value-consuming part. > Neither part has to be transformed in a non-obvious way. With > iterators alone, you do this by rewriting the value-producing part as > an Iterator class. This obfuscates the iterator implementation.
Thanks, this is nice and short. I wanted to give example links and excerpts for those new to generators, but what you wrote here is a great summary and intro. BTW, no single nominal Iterator class or interface is required, of course -- all you need is an object 'like IteratorType'. > It's hardly news that abstracting from sequences is useful. Various > languages have had iterators, streams, and lazy lists as core, > essential features (with syntactic support) for decades now. For > stateful languages, like Python and C#, iterators and generators fill > this gap better than anything else I've seen. Agreed. > Adobe's position paper commented about generators not being that > useful, because they're not "deep", like full coroutines. Not to worry, Adobe is on board: http://spreadsheets.google.com/pub?key=pFIHldY_CkszsFxMkQOReAQ&gid=2 (I hope this is publicly readable -- it should be). /be _______________________________________________ Es4-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es4-discuss
