From: Sam Stephenson <sstephenson@...>
Date: 2005-01-07T05:08:10+09:00
Subject: Re: Return from a block?

On Fri, 7 Jan 2005 00:38:59 +0900, E S <eero.saynatkari@kolumbus.fi> wrote:
>
> For just returning control, throw...catch should work, for returning
> a value, Kernel.callcc? But Mr. Buck's solution is certainly shorter.

Another way to do it is to rescue LocalJumpError.

| def yield_with_return_value(*args)
|   yield *args
| rescue LocalJumpError => e
|   e.exit_value
| end
|
| def foo(&block)
|   yield_with_return_value &block
| end

irb(main):001:0> foo {return "hello"; "this is not returned"}
=> "hello"
irb(main):002:0> foo {"bar"}
=> "bar"

Sam