On May 30, 7:03 pm, Marnen Laibow-Koser <rails-mailing-l...@andreas-
s.net> wrote:
> Jonathan Rochkind wrote:
>
> [...]
>
> > The {| | } and the 'do' syntaxes are interchangeable in all ways.
>
> Almost. I've run across a couple of cases where one works and the other
> doesn't -- one creates a Proc and the other doesn't, or something like
> that.
{} binds more tightly than do..end - in some cases this can lead to
your block being passed to the 'wrong' method:
def foo(x)
puts "foo #{block_given?}"
end
def bar
puts "bar #{block_given?}"
end
running foo bar {} outputs
bar true
foo false
but running
foo bar do
end
outputs
boo false
foo true
Fred
> But that's vanishingly rare, and 99 times out of 100, you will
> not go wrong to treat them as interchangeable.
>
> > More
> > of a Ruby question than a Rails one.
>
> Yup.
>
> Best,
> --
> Marnen Laibow-Koserhttp://www.marnen.org
> mar...@marnen.org
> --
> Posted viahttp://www.ruby-forum.com/.
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