From: "David A. Black" <dblack@...>
Date: 2008-09-17T19:02:36+09:00
Subject: Re: Advanced conditionals

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Hi --

On Sat, 13 Sep 2008, Pe=F1a, Botp wrote:

> From: David A. Black [mailto:dblack@rubypal.com]
> ...
>>> e =3D [1,2,3].select{|n| n>1},{|x| x*10}
>> =3D>[20,30]
>>
>> meaning, do a (re)map if a second code block is passed
>> That comes up periodically.... It never appealed to me; I guess I
>> think of it like a method having two argument lists. Besides, how
>
> indeed. and i think we agree to disagree there.
> i prefer that code blocks be generics and be passed like normal
> arguments. ergo, they will now be explicitly defined in def. less
> invisible ink? ;)

It's not really an invisible ink thing -- more about the semantics or
anatomy of a method call. The thing is, you can already pass procs as
normal arguments, so if you allow that to happen without specifying
that they are procs (i.e., {} instead of proc {}), the main effect is
that you lose the concept of the code block, and presumably you lose
yield.

So all you gain, really, is not having to write "proc". I don't think
it's worth it; I like the whole block/yield/iterator thing too much.

>> would you distinguish it from a hash literal? :-)
>
> strengthen the parser. currently, since a code block come last, then
> the rest should be code blocks, if any. also, if a token arg
> sequence of "{|" is caught, then that should start a code block.
> meaning {||} is always a code block.

That's ugly, though -- you'd end up with a lot of empty ||'s.


David

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