From: Robert Klemme <shortcutter@...>
Date: 2012-04-17T22:36:39+09:00
Subject: Re: Why doesn't Fixnum#to_d exist?

On Sun, Apr 15, 2012 at 7:48 PM, Chad Perrin <code@apotheon.net> wrote:
> On Sun, Apr 15, 2012 at 05:35:12AM +0900, Josh Cheek wrote:
>> On Sat, Apr 14, 2012 at 11:45 AM, Chad Perrin <code@apotheon.net> wrote:
>> > On Sat, Apr 14, 2012 at 07:23:34AM +0900, Mark Campbell wrote:
>> > >
>> > > Yes, that file has the String#to_d, Float#to_d and Rational#to_d.
>> > > Fixnum#to_d is not present.
>> >
>> > Strange.  It appears you're right.  I can do 1.to_d, but I don't know
>> > what class has the method when I use it like that.
>>
>> You can ask the method for its owner to find out
>> 1.method(:to_d).owner # => Integer
>
> Thanks.  That's the method I was trying to remember, but it wouldn't come
> to me.
>
> It's pretty strange how this works, though:
>
>    >> Integer.methods.include? :to_d
>    => false

Integer.methods will return methods of the instance Integer (i.e. the
class object)!  You rather want Integer.instance_methods.

>    >> 1.method(:to_d).owner
>    => Integer
>
> . . . so, because I was using the Integer.methods.include? approach
> earlier, I didn't find it in Integer either.  Shouldn't the class report
> the method when asked even if it's added by a mixin or straight-up
> monkeypatch?

See above.

Kind regards

robert


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