From: John W Higgins <wishdev@...>
Date: 2010-11-12T13:43:27+09:00
Subject: Re: Scheme's (cond ((assertion) (value))...(else (value))) statement implemented in ruby?

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Good Morning,

On Thu, Nov 11, 2010 at 8:25 PM, timr <timrandg@gmail.com> wrote:

> On Nov 11, 5:51 pm, Clifford Heath <n...@spam.please.net> wrote:
>
> Case interrogates a single variable for its state--whether it falls in
> a certain range, or is equal to such and such a value. The cond
> statement is much more flexible, in that each assertion can be
> completely unrelated to the other assertions--i.e. they can cover more
> than the state of a single variable.
>

Nope, well sort of nope - you are right that it checks against a single
variable but you are missing the trick. However the default "variable" for
case is true and there are lots of options outside of the default as well.

As an example

x = 1
y = 2
case
  when x == 2 then puts 'x'
  when y == 2 then puts 'y'
end

That outputs a nice shiny "y"

or

x = 1
y = 2
case false
  when x == 2 then puts 'x'
  when y == 2 then puts 'y'
end

This outputs an even shiner "x"

And even nicer

x = 1
y = 2
case 2
  when x then puts 'x'
  when y then puts 'y'
end

A nice shiny 'y' pops up on the screen

John

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