From: Daniel Martin <martin@...>
Date: 2006-08-09T23:28:43+09:00
Subject: Re: For Float#class why is '===' different from '=='

"richB" <richard_a_brunner@yahoo.com> writes:

> I appreciate the responses. I'm still puzzled. It seems that "case a"
> is different from "case a.class" and that the comparison being done by
> "===" in when is influenced by the type/class of the when operand.

Yes.  The best way I have of mentally modelling === is this:

lhs === rhs   means  "Does rhs match lhs?", where the definition of
what matches depends of course on the nature of lhs.

When lhs is a class object, it makes sense to say that 'match' means
the same as 'is_a?'.  When lhs is a range, it makes sense to say that
'match' means the same as 'includes?'.  When lhs is a Regexp, 'match'
already has a useful meaning.