From: "James, Roshan (Cognizant)" <JRoshan@...>
Date: 2004-04-22T03:54:36+09:00
Subject: Re: A Ruby WishList

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Mauricio Fern=E1ndez [batsman.geo@yahoo.com]:

//I tried to post a comment on your site but I keep getting=20
//Server Error in '/' Application.
Oh, did you face a problem? I just tried, things seem fine now - don't =
know what it was.=20

//You can find a lot of postings about ++ and -- in ruby-talk,=20
//so I'm not going to repeat that here. As for +=3D, once you=20
//define + you get +=3D for free, and a +=3D b will *always* mean a=20
//=3D a + b. Same with other OP=3D things.
Sorry about mentioning +=3D, that was stupid of me.=20

//I rather like the fact that blocks can be spotted easily at=20
//the moment.
Hmm.. I did not think of it that way. Spotting code blocks easily, so a =
different syntax... Well you may have a vague point there. I'd stil like =
to see the braces. But yeah that's a feature I could live without too. =
But a '}' is a lot easier to type than a 'end'.=20

//In Ruby 2.0, you'll be able to do
//10.times{|n| (sum ||=3D 0) +=3D n }
//puts "Sum is #{sum}"
//due to the new rules for block variables.
//
//as for=20
//> 10.times{|n| sum<0> +=3D n; prod<1> *=3D n; }
//there's no need to import clumsy syntax into Ruby IMHO.

Mmm. I have read specs for 2.0 yet that explain what '10.times{|n| (sum =
||=3D 0) +=3D n }' could mean. Looks a lot like 'sum<0> +=3D n' to me. =
Could you drop me a urls to the specs?


//>  Currying of Methods and Partial Evaluations
//
//>> add =3D lambda{|x,y| x + y }
//=3D> #<Proc:0x401fb358@(irb):1>
//>> def curry(proc, *args); lambda{|*a| proc.call(*(args+a))} end
//=3D> nil
//>> add10 =3D curry(add, 10); add2 =3D curry(add, 2)
//=3D> #<Proc:0x401f5a0c@(irb):2>
//>> add10[1]
//=3D> 11
//>> add2[1]
//=3D> 3
//
//This could be done on methods too (without having to reify them with
//method(:meth)) *if* parens. were needed (as in Python) to actually=20
//do the method call. See=20
//http://onestepback.org/index.cgi/Tech/Ruby/PythonAndRuby.rdoc.

Neat. Very impressive. Thank you.=20
I would actually like to add this to my comments for later reference.=20



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