From: Robert Klemme <bob.news@...>
Date: 2005-06-01T18:15:23+09:00
Subject: Re: array of object insert polices

dave wrote:
> hy list,
>
> if i have a class as:
>
> class IntegerArrray < Array
> end
>
> should i check if user inserts non Integer values ?

What other reason would there be for IntegerArray other than making it a
type safe array for integers?

> if yes how?

def ensure_int(obj)
  raise TypeError, "Not an int: #{obj.inspect}" unless Integer === obj
end

And call this whenever new elements enter the (<<, []= ...).

> if not why?

Duck typing.  Code that relies on ints in there will soon discover if
someone puts something non numeric in there.

Kind regards

    robert