From: Shyouhei Urabe <shyouhei@...>
Date: 2011-05-27T08:50:42+09:00
Subject: [ruby-core:36499] [Ruby 1.9 - Feature #4786] RCR new Feature: Numeric#grouped


Issue #4786 has been updated by Shyouhei Urabe.


P.S.  POSIX does specify printf("%'d"), but this does not define _how_ the numbers are grouped, because of course, by theory they cannot.
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Feature #4786: RCR new Feature: Numeric#grouped
http://redmine.ruby-lang.org/issues/4786

Author: Roger Pack
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 


Hello all.

As discussed in http://www.ruby-forum.com/topic/1060694#new with apparently no objection, this is a request for an easy way to get comma separated string values from numeric types.

Background:
Currently in ruby you can enter large numbers with digit grouping:
a = 1_000_000_000

however there is no convenient way to convert from a number back to digit grouping

Suggestion:

>> 1_000_000_000.grouped
=> "1,000,000,000"


 class Numeric
   def separate(sep=",")
     self.to_s.reverse.scan(/(?:\d*\.)?\d{1,3}-?/).join(sep).reverse
   end
 end

Another option would be to support this extended printf syntax:

>> "%'d" % 12345678
=> 12,345,678

Though I'd lean toward the former.

Feedback?
Thanks.
-roger-


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