From: matt@... (matt neuburg)
Date: 2009-03-12T01:23:02+09:00
Subject: Re: return doesn't always exit my method

Benjamin Thomas <benjamin.thomas81@free.fr> wrote:

> If I type 'exit', the function should normally exit, via a return
> statement. But this does not always happen and I really can't understand
> why. I've been scratching my head for a few hours on that so I'm posting
> here hoping somebody will be able to spot my obvious mistake!
> 
> I'm trying to apply here the concept of recursion so maybe this is where
> I'm messing up.

To abort a deep call chain, you can use catch() and throw():

def go_deeper(level)
  throw(:done) if level > 3
  puts "Level #{level}"
  go_deeper(level+1)
end

catch(:done) {go_deeper(0)}
puts "finished"

m.

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