Formatted output for numbers with comma's?

ruby-talk
1

I was looking for a routine to convert a Number to a string with comma's, is there a routine in the library for that?

Wink

2

Wink Saville wrote:

I was looking for a routine to convert a Number to a string with
comma's, is there a routine in the library for that?

http://rubyforge.org/snippet/detail.php?type=snippet&id=8

http://extensions.rubyforge.org/rdoc/classes/Numeric.html#M000011

http://globalize-rails.org/wiki/

3

It's not very hard to roll up a solution:

   def commify( number )
     number.to_s.reverse.gsub(/(\d\d\d)(?=\d)(?!\d*\.)/, '\1,').reverse
   end

Hope that helps.

James Edward Gray II

···

On Mar 14, 2006, at 2:11 AM, Wink Saville wrote:

I was looking for a routine to convert a Number to a string with comma's, is there a routine in the library for that?

4

This would be a nice (ruby builtin) method :slight_smile:

  def commify( number, positions)
    positions = 3 if positions == nil
    puts number.to_s.reverse.gsub(/(\d\d\d)(?=\d)(?!\d*\.)/, '\1,').reverse
      ^ not very sure how it would be done but something similar to
("\d"*positions)
  end

  puts commify(12345) # 12,345
  puts commify(12345, 2) # 1,23,45

···

On 3/14/06, James Edward Gray II <james@grayproductions.net> wrote:

On Mar 14, 2006, at 2:11 AM, Wink Saville wrote:

> I was looking for a routine to convert a Number to a string with
> comma's, is there a routine in the library for that?

It's not very hard to roll up a solution:

   def commify( number )
     number.to_s.reverse.gsub(/(\d\d\d)(?=\d)(?!\d*\.)/, '\1,').reverse
   end

Hope that helps.

James Edward Gray II

5

...it's significantly harder to do it completely *right*, though.

See Gavin Sinclair's Extensions library in Numeric. I have a
relatively complete method written there, done in test-first style.

-austin

···

On 3/14/06, James Edward Gray II <james@grayproductions.net> wrote:

On Mar 14, 2006, at 2:11 AM, Wink Saville wrote:
> I was looking for a routine to convert a Number to a string with
> comma's, is there a routine in the library for that?

It's not very hard to roll up a solution:

   def commify( number )
     number.to_s.reverse.gsub(/(\d\d\d)(?=\d)(?!\d*\.)/, '\1,').reverse
   end

--
Austin Ziegler * halostatue@gmail.com
               * Alternate: austin@halostatue.ca

6

+1 vote as I've needed it quite a bit.

How would I/we go about getting something like this in stdlib?

have fun,

SteveC steve@asklater.com http://www.asklater.com/steve/

···

* @ 15/03/06 01:27:40 AM caldridge@gmail.com wrote:

This would be a nice (ruby builtin) method :slight_smile: