From: Jimmy Kofler <koflerjim@...>
Date: 2007-08-24T20:56:06+09:00
Subject: Re: Selecting indices from an array

> Posted by Ronald Fischer (Guest) on 23.08.2007 12:59 
> 
> ...
> Is there in Ruby a function similar select, where I also get the array element passed through, kind of:
> 
> a.select_index {|index,value| value?~/g$/}
>
> or do I have to write my own here? I don't want to reinvent the wheel....
>
> Ronald

How about:

module Enumerable
  def select_index
    index = -1
    (block_given? && self.class == Range || self.class == Array)  ? 
collect { |x| index += 1; yield(x,index) }.compact : self
  end
end

p ("a".."n").select_index { |x,i| i if x =~ /[c-g]/ }
=> [2, 3, 4, 5, 6]


Cheers,

j.k.





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