From: Ken Kunz <kennethkunz@...>
Date: 2006-10-12T06:40:17+09:00
Subject: Re: case ... when and arrays (or what was why_ showing us at railsconf europe)

To determine if some object is included in a collection:

    collection.include? obj

e.g.:

    %w(foo bar baz).include? "foo"
    => true

also, have a look at Enumerable#grep -- it uses === for comparison
(just like case/when):

    a = [ "bar", 3, 7.5, "baz" ]

    a.grep String
    => ["bar", "baz"]

    a.grep Numeric
    => [3, 7.5]

    a.grep /^b/
    => ["bar", "baz"]

    a.grep "bar"
    => ["bar"]

    a.grep 1..5
    => 3

-Ken

J2M wrote:
> I like that so much I want more...
> 
> Can you do something equivalent with an if and *bang?