From: matz@... (Yukihiro Matsumoto)
Date: 2001-09-06T14:49:35+09:00
Subject: [ruby-talk:20950] Re: calling original method in overrided method?

Hi,

In message "[ruby-talk:20940] calling original method in overrided method?"
    on 01/09/06, Henry House <hajhouse@houseag.com> writes:

|I don't like the default behavior of String#to_i and String#to_f to return
|zero for any string that contains no recognizable numbers. I had thought to
|write overriding methods like so:
|
|Class String
|	def to_i
|		fail "#{self} is not a valid integer" unless self =~ /^\d*$/
|		# call original to_i
|	end
|end
|
|...but I don't how (if it is possible?) to call the original to_i. Am I stuck
|with using a new method name or a custom string class?

use alias.

  class String
    alias original_to_i
    def to_i
    end
  end

You can use Integer() for strict checked conversion.

  Integer("abc")
  # => `Integer': invalid value for Integer: "abc" (ArgumentError)

							matz.