From: Gregory Brown <gregory.t.brown@...>
Date: 2008-08-22T03:15:28+09:00
Subject: Re: "num in [1,2,3,4]" in a cool way?

On Thu, Aug 21, 2008 at 1:51 PM, Iñaki Baz Castillo <ibc@aliax.net> wrote:
> El Jueves, 21 de Agosto de 2008, Gregory Brown escribió:
>> On Wed, Aug 20, 2008 at 5:32 PM, Iñaki Baz Castillo <ibc@aliax.net> wrote:
>> > Hi, AFAIK in Ruby the only (or the "coolest") way to do something as:
>> >
>> >  if num in [1,2,3,4]
>> >
>> > is by doing:
>> >
>> >  if [1,2,3,4].index(num)
>> >
>> > Is it? any other "cooler" way? Thanks.
>>
>> num.between?(1,4)
>
> Great, I didn't know!  :)
>
> But in my case I'm using custom objects instead of Fixnum or String.

Sure, this is implemented by Comparable, so you just need to include
that module and implement <=>

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