From: Siep Korteling <s.korteling@...>
Date: 2008-12-08T21:30:15+09:00
Subject: Re: A quetion about ruby string

Zhao Yi wrote:
(...)
> 
> Does Ruby support RTTI (runtime type identification)? This problem is 
> that the type of the parameter should be Regexp instance, however ruby 
> doesn't check type on the method declaration. So I am looking for this 
> kind of method:
> 
> def match(pattern)
>     if pattern instanceof String
>          p = Regexp.new(pattern)
>     end
>     ...
> end
> 
> In this way, I can check the type of the parameter so that the client 
> code doesn't need to change.

pattern.instance_of? String

But why check if it is a string or a regexp, when Regexp.new accepts 
both?

def match(pattern)
  puts "Hello" =~ Regexp.new(pattern)
end

r = /ello/
puts r.instance_of?(Regexp)
match(r)

s = "ello"
match(s)

hth,

Siep

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