From: badboy <badboy@...>
Date: 2009-04-28T21:56:47+09:00
Subject: Re: Is there anything like Array#Index that takes a block?

Lee Griffiths schrieb:
> 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.
hm...oh =/
ruby 1.8.7 (and 1.9.1, too)