[ruby-talk:14349] Re: case and to_s

On Sat, 28 Apr 2001, David Alan Black wrote:

> This is in effect performing the test:
>
>    /DeviceA/ === d.type
>
> but Regexp#=== (case equality method for Regexp) expects a String on
> the other end of the line, not a Class.
>
> You could force a regexp-to-string test:
>
>   case d.type.to_s
>   (etc.)
>
I just figured this out.
    case d.type.to_s
    when "DeviceA"

I was hoping to be able to

    case d.type
    when DeviceA

since in an if I can do
 if DeviceA == d.type

but no luck, so, I will stick with your first
suggestion.

Thanks

> Or you could do:
>
>   case d
>   when DeviceA
>     (etc.)
>
> because then your test is:
>
>   DeviceA === d
>
> and Module#===, to paraphrase the pickaxe (p. 345), will return true
> if d is an instance of DeviceA or one of DeviceA's descendants.  (The
> descendants part may not be desireable, but you can always use the
> string-based test above instead.)
>
>


=========================================================
Jim Freeze
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