From: "Jan E." <lists@...>
Date: 2012-09-03T20:47:44+09:00
Subject: Re: hwo to compare a number use in[a..b]

Hi,

Be careful not to mix up "=" (assignment) and "==".

You can either use the logical "or":

if A == 13 or A == 14
  ...

Or you can use Array#include:

if [13, 14].include? A
  ...

The latter doesn't really make sense here, but it's useful when you have 
a lot of values.

In your specific case it might make more sense to put the error handling 
on top:

raise ... unless A == 13 or A == 14
# do something

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