From: Ross Bamford <rosco@...>
Date: 2006-11-17T22:30:04+09:00
Subject: Re: #returning and #tap

On Fri, 17 Nov 2006 11:57:58 -0000, <dblack@wobblini.net> wrote:

>> 'tap' had a different intent, though - "tee off the object without
>> disturbing it" - even if it did the same thing in the end. So you
>> would typically take a.foo.bar.baz.quux... and drop in a tap,
>> a.foo.bar.tap {|i| puts "hi mom! this is #{i}"}.baz.quux, and take
>> care not to modify i destructively.
>
> Although... there might be cases where disturbing the object would be
> desireable.  For example, you could use it to work around the fact
> that a lot of bang methods return nil when there's no change:
>
>    str = "abcde"
>    a = str.tap {|s| s.gsub!(/z/,"x") }.split(//)
>

Sweet!

-- 
Ross Bamford - rosco@roscopeco.remove.co.uk