From: Daniel Schierbeck <daniel.schierbeck@...>
Date: 2005-12-09T00:07:36+09:00
Subject: Re: do/end vs braces

Steve Litt wrote:
> Hi all,
> 
> It looks to me like when you use an iterator (each for instance), you can make 
> the block either from a do/end pair, or from curly braces. All things being 
> equal, I'd greatly prefer to use do/end. Are there any differences in runtime 
> speed, capabilities, or Rubyness?

There's a slight difference in how they're parsed.

   foo bar { block }

is the same as

   foo(bar { block })

while

   foo bar do
     block
   end

is the same as

   foo(bar) do
     block
   end

or

   foo(bar) { block }

but it's only an issue when you leave out the parantheses. The styling 
convention is that the curly braces are used for one-line blocks and the 
do..end for multi-line blocks

   foo { make_me_a_bar }
   bar do
     foo = Foo.new
     pass_the_foo(foo)
     do_something_else
   end


Cheers,
Daniel