From: "Wolfgang Nádasi-Donner" <ed.odanow@...>
Date: 2008-10-22T03:51:22+09:00
Subject: [ruby-core:19423] Re: Now that lambda has more powerful arguments...

Dave Thomas schrieb:
> is there anything that
> 
>  -> (..) { .. }
> 
> can do that
> 
>   lambda {|...| ...}
> 
> cannot do?
If you include "it can be very confusing" into the list of possible 
answers, then the examples from "eigenclass.org" will show it...

irb(main):001:0> -> a, b  { a + b }.call(1,2)
=> 3
irb(main):002:0> c = 1; -> a, b; c  { c = a + b }.call(1,2); c
=> 1
irb(main):003:0> c = 2; -> ;c { c = 1 }.call; c
=> 2
irb(main):004:0> c = 2; -> *d ; c { d }.call(1,2,3)
=> [1, 2, 3]
irb(main):005:0> c = 2; -> ; c { c = 1 }.call; c
=> 2

Because the parantheses can be ommited, it can came closer to RegExes 
from the viewpoint of readability ;-)

Wolfgang N�dasi-Donner