From: Glen Holcomb <damnbigman@...>
Date: 2008-07-03T01:56:31+09:00
Subject: Re: Ranges and Enumerable problems

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On Wed, Jul 2, 2008 at 10:34 AM, David A. Black <dblack@rubypal.com> wrote:

> Hi --
>
>
> On Thu, 3 Jul 2008, Glen Holcomb wrote:
>
>  On Wed, Jul 2, 2008 at 9:12 AM, Robert Klemme <shortcutter@googlemail.com
>> >
>> wrote:
>>
>>  2008/7/2 Glen Holcomb <damnbigman@gmail.com>:
>>>
>>>> Okay so when I play with "!".."~" wrong things happen.
>>>>
>>>> ("!".."~").include?("W")
>>>> true
>>>>
>>>> ("!.."~").include?(" ")
>>>> false
>>>>
>>>> so far so good, however.
>>>>
>>>> ("!".."~").each do |c|
>>>> puts c
>>>> end
>>>>
>>>> !
>>>> "
>>>> #
>>>> $
>>>> %
>>>> &
>>>> '
>>>> (
>>>> )
>>>> *
>>>> +
>>>> ,
>>>> -
>>>> .
>>>> /
>>>> 0
>>>> 1
>>>> 2
>>>> 3
>>>> 4
>>>> 5
>>>> 6
>>>> 7
>>>> 8
>>>> 9
>>>> => "!".."~"
>>>>
>>>> This is wrong!
>>>>
>>>> ("!".."~").last
>>>> => "~"
>>>>
>>>> This is also right.
>>>>
>>>> It looks to me like a problem with the Enumerable mixin but I guess the
>>>> question is why?
>>>>
>>>
>>> Note this
>>>
>>> irb(main):003:0> "9".succ
>>> => "10"
>>>
>>> Try this instead:
>>>
>>> (?!..?~).each {|c| p c.chr}
>>>
>>> irb(main):008:0> (?!..?~).include? ?\
>>> => false
>>>
>>>  Thanks Robert,
>>
>> That is interesting.  I wonder why it doesn't work as you would expect.
>>  The
>> range object seems to be correct (at least through limited include?
>> testing)
>> however it returns incomplete info whenever you use an Enumerable method
>> or
>> a method that appears to use an Enumerable method.
>>
>
> In 1.9 you get this:
>
>  ('!'..'~').to_a
>>>
>> => ["!", "\"", "#", "$", "%", "&", "'", "(", ")", "*", "+", ",", "-",
> ".", "/", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", ":", ";",
> "<", "=", ">", "?", "@", "A", "B", "C", "D", "E", "F", "G", "H", "I",
> "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W",
> "X", "Y", "Z", "[", "\\", "]", "^", "_", "`", "a", "b", "c", "d", "e",
> "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s",
> "t", "u", "v", "w", "x", "y", "z", "{", "|", "}", "~"]
>
>
> David
>
> --
> Rails training from David A. Black and Ruby Power and Light:
>  Intro to Ruby on Rails  July 21-24      Edison, NJ
>  Advancing With Rails    August 18-21    Edison, NJ
> See http://www.rubypal.com for details and updates!
>
>
Thanks David,

That is good to know.  Maybe I should upgrade.

-- 
"Hey brother Christian with your high and mighty errand, Your actions speak
so loud, I can't hear a word you're saying."

-Greg Graffin (Bad Religion)

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