From: George Ogata <g_ogata@...>
Date: 2004-07-06T08:52:40+09:00
Subject: Re: Array::index and rindex operator

Hadmut Danisch <nospam@danisch.de> writes:

> Hi,
>
> the Array::index and rindex functions
>
>    arr.index( anObject ) -> anInteger or nil
>    Return the index of the first/last object in arr such that the
>    object == anObject. Returns nil if no match is found.
>
>
>
> Wouldn't it be better to have
>
>    such that anObject === object ?


I'm not so sure about that; #=== is primarily meant for case
statements, and very few methods use it like the way you propose.  It
would also separate it from other Array/Enumerable methods like #find,
#delete, #include?, etc.

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.