From: Lee Griffiths <poddster@...>
Date: 2009-04-28T21:55:35+09:00
Subject: Re: Is there anything like Array#Index that takes a block?

badboy wrote:
> Lee Griffiths schrieb:
>> I would like to avoid doing :
>> Array.index(Enumerable.find { |blarg| blarg =~ /blah/ })
>> 
>> as that traverses the array twice. Is there any built in method that
>> does this for me? That is, it's a method that takes a block and returns
>> the index of the first element for which this block returns true?
>> 
>> Thanks
> yes... it's called Array#index *scnr*
> ri says:
>      array.index(obj)           ->  int or nil
>      array.index {|item| block} ->  int or nil
>   ...
>   If a block is given instead of an argument, returns first
>      object for which _block_ is true.
> 
> so...just use #index with a blocck

Which version of Ruby is that for? My ri, irb and ruby don't confirm 
this. I'm using Ruby 1.8.6. Additionally http://www.ruby-doc.org/core/ 
claims that Array#index only has a single implementation.
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