From: Sebastian Hungerecker <sepp2k@...>
Date: 2007-12-09T06:59:53+09:00
Subject: Re: .max a Block of code with yield?

Wesley Rishel wrote:
> require 'find'
> Find.find (pth) { |x| yield(x)}.max
>
> giving the error no block given (LocalJumpError), which I interpret as
> saying the yield doesn't know to yield to max.

yield(x) means: "Execute the block that has been given to this method with the
parameter x". You can't yield to methods. Especially since the max won't start
executing before the find is finished executing.


> It is possible that this is equivalent to asking if there is a way to
> feed the output of an iterator into somthing that is looking for the the
> .each iterator of an enum.

That's possible using to_enum. To enum from the enumerator library (which
is part of stdlib) can be called on any object and turns it into an enum by
taking the method given as a parameter as an replacement for each. E.g.:

require 'find'
require 'enumerator'
Find.to_enum(:find,pth).max

Or you could just use Dir[] instead of Find.find, which returns an array which 
is enumerable by default. Like Dir["/my/path/**/*"].max


HTH,
Sebastian
-- 
Jabber: sepp2k@jabber.org
ICQ: 205544826