From: richB <richard_a_brunner@...>
Date: 2006-08-09T11:45:10+09:00
Subject: Re: For Float#class why is '===' different from '=='

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.

I guess I wasn't expecting this.  I am still trying to iron out my
conceptual understanding. Is it that "case a" is asking about the
object a, whereas
"case a.class" is asking about the object/attribute a.class. Clearly a
is Float but a.class is something else that evaluates to Float?

irb(main):001:0> a=2.3
=> 2.3
irb(main):002:0> case a.class
irb(main):003:1> when Float then puts "match"
irb(main):004:1> end
=> nil

irb(main):005:0> a=2.3
=> 2.3
irb(main):006:0> case a
irb(main):007:1> when Float then puts "match"
irb(main):008:1> end
match
=> nil

irb(main):009:0> a.class
=> Float

irb(main):010:0> case a
irb(main):011:1> when 2.3 then puts "match"
irb(main):012:1> end
match
=> nil

Thanks!