From: Robert Klemme <shortcutter@...>
Date: 2009-12-23T16:58:20+09:00
Subject: Re: integers and floats

2009/12/22 Florian Gilcher <flo@andersground.net>:
>
> On Dec 22, 2009, at 11:19 AM, Robert Klemme wrote:
>
>> 2009/12/22 Florian Gilcher <flo@andersground.net>:
>>>
>>> On Dec 22, 2009, at 11:03 AM, Paul Smith wrote:
>>>
>>>> On Tue, Dec 22, 2009 at 2:16 PM, Rajinder Yadav <devguy.ca@gmail.com> wrote:
>>>
>>>> I have no idea what, if anything, has the object_ids 0, and 2.
>>>
>>> Pretty easy: false and true.
>>>
>>> irb(main):001:0> true.object_id
>>> => 2
>>> irb(main):002:0> false.object_id
>>> => 0
>>
>> You need to know but there is a way that works without oracle turing machine:
>>
>> irb(main):005:0> 10.times {|i| printf "%4d %p\n", i,
>> ObjectSpace._id2ref(i) rescue nil}
>>   0 false
>>   1 0
>>   2 true
>>   3 1
>>   4 nil
>>   5 2
>>   7 3
>>   9 4
>> => 10
>>
>> :-)
>>

> I didn't use oracle turing machine, I only used irb to validate my pre-existing knowledge.

See, that's exactly what I meant.

> But thanks for the trick :-).

You're welcome.

Cheers

robert

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