Comments on: How to pass the current binding’s block to some other method?

By: Lyle

Lyle — Fri, 09 Feb 2007 00:37:04 +0000

@Mauricio: OK, I now see that the method that you and Phrogz were recommending does work, at least with a little sample program I wrote. For some reason I didn’t think that it was working properly in my “real” code; I need to go back and see what I was doing differently.

@Brian: Joel VanderWerf (from the ML) suggested a similar approach, but just doing another “yield self” in the block instead of using block.call(self). I think either one should work similarly.

By: Lyle

Lyle — Fri, 09 Feb 2007 00:23:57 +0000

@Aaron (and mfp): I was looking for some way that doesn’t require me to modify the original source code for try().

@Brian: Good idea! I think that should do the trick.

By: Brian

Brian — Fri, 09 Feb 2007 00:13:08 +0000

could your “new” try method just be something like:
def try(hash,&block) if block old_try(hash[:x], hash[:y], hash[:z] ) { |self| block.call(self) } else old_try(hash[:x], hash[:y], hash[:z]) end end

By: mfp

mfp — Fri, 09 Feb 2007 00:06:55 +0000

forgot to say that the &Proc.new thing also works, but &block is better and does what you want

By: mfp

mfp — Fri, 09 Feb 2007 00:05:34 +0000

As Phrogz showed in the ML:

# unmodified def try(x, y, z) (yield * y) if block_given? end # ^^^^


alias old_try try
def try(hash, &block)

  old_try(*hash.values_at(:a, :b, :c), &block)

end

try(:a => 1, :b => 5, :c => 3) { "foo" } # => "foofoofoofoofoo" RUBY_VERSION # => "1.8.5"

By: Aaron Pfeifer

Aaron Pfeifer — Thu, 08 Feb 2007 23:46:33 +0000

I could be misinterpreting your question, but do you mean something like this?

alias old_try try def try(hash, &block) old_try(hash[:x], hash[:y], hash[:z], &block) end