From: Kristof Bastiaensen <kristof@...>
Date: 2004-07-06T19:52:48+09:00
Subject: Re: Array::index and rindex operator

Hi,

On Tue, 06 Jul 2004 09:42:41 +1000, George Ogata wrote:

> Sometimes though I wish that #index could take a block (i.e., return
> the first index for which the block is true).  Unless I'm overlooking
> something, there doesn't seem to be a method that does this.  I don't
> know what others think of the idea, but that would probably go some
> way towards your goal.

I think that would be nice.  I would vote for it.
You could do this with enumerator, but it is not so compact:

require "enumerator"

a = %w(one two three)
a.enum_for(:each_with_index).find { |s, i| s == "two" }[1]
=> 1

Regards,
Kristof