From: Sam Roberts <sroberts@...>
Date: 2004-03-19T23:49:03+09:00
Subject: Re: Can I stop each's iteration, and get the results so far?

Wrote Robert Klemme <bob.news@gmx.net>, on Fri, Mar 19, 2004 at 05:59:36PM +0900:
> > Basically, I want to break from a find_all, and get the array of
> > elements found so far. Is this possible?
> >
> > I tried this, no luck with find_all and collect, they return nil,
> > instead of the array so far. Any suggestions on how to do this?
> 
> #inject is your friend:
> 
> > puts "all n between 100 and 200?"
> >
> > p every.find_all { |n| break if n > 200; n >= 100 && n <= 200 }
> 
> irb(main):076:0> every.inject([]) { |arr,n| break arr if n > 200; arr<<n
> if n >= 100 && n <= 200; arr }
> => [102, 105, 108, 111, 114, 117, 120, 123, 126, 129, 132, 135, 138, 141,
> 144, 147, 150, 153, 156, 159, 162, 165, 168, 171, 174, 177, 180, 183, 186,
> 189, 192, 195, 198]

Thanks, thats useful to know, and odd!

Why can you break from inject and get the result, but not from find_all
or collect?

Is this a bug, an oversight, or is something about the methods that
makes them need to be different?


Cheers,
Sam

-- 
Sam Roberts <sroberts@certicom.com>