From: Robert Klemme <bob.news@...>
Date: 2004-08-09T16:21:20+09:00
Subject: Re: FirstEachLast, an extension to the Enumerable module.


"John Carter" <john.carter@tait.co.nz> schrieb im Newsbeitrag
news:Pine.LNX.4.61.0408091724450.32554@parore.tait.co.nz...
> I know somewhere is a collection of extensions to the enumerable module.
>
> Is the rubygarden page
>   http://www.rubygarden.org/ruby?StandardClassExtensions/Enumerable
> the only one?
>
> Anyway, I have just added FirstEachLast to that.
>
> Use it like so...
>
> require 'FirstEachLast'
>
> def test_first_each_last(any_enumerable_object)
>    result = nil
> count =
>    any_enumerable_object.first_each_last( proc {|first|
>                                                  result = "First
#{first}"
>                                                },
>                                                proc {|i|
>                                                  result += " then #{i},"
>                                                },
>                                                proc {|last|
>                                                  result += " and last of
all #{last}"
>                                                },
>                                                proc {|| result =
'Empty!'}
>
>    puts count
>    puts result
> end
>
> test_first_each_last( [1,2,3,4])
> test_first_each_last( [])
>
> Will result in the following output...
> 4
> First 1 then 2, then 3, and last of all 4
> 0
> Empty!

Nice output, but what do you need that for?

    robert