RCR feedback: Numeric#grouped

ruby-talk
1

Hello all.
I notice in ruby there's an easy to way to input "separated" number:

1_000_000
1_000_000.0

But there doesn't seem to be an easy way to "separate" digits when
outputting. At least I'm not aware of any.
The end goal would be something like

print "human readable with commas: #{1_000_000.0.grouped(',')}"

human readable with commas: 1,000,000.0

Does this already exist and, if not, any feedback (method name,
suitability) for its addition?
Thank you!
-r

···

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2

Try this:

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

100.separate
=> "100"

100000.separate
=> "100,000"

1000000000.separate
=> "1,000,000,000"

1000000000.separate('.')
=> "1.000.000.000"

10000.12345.separate
=> "10,000.12345"
==== end snippet ====

~ jf

···

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John Feminella
Principal Consultant, BitsBuilder
LI: http://www.linkedin.com/in/johnxf
SO: User John Feminella - Stack Overflow

On Thu, Feb 10, 2011 at 14:59, Roger Pack <rogerpack2005@gmail.com> wrote:

Hello all.
I notice in ruby there's an easy to way to input "separated" number:

1_000_000
1_000_000.0

But there doesn't seem to be an easy way to "separate" digits when
outputting. At least I'm not aware of any.
The end goal would be something like

print "human readable with commas: #{1_000_000.0.grouped(',')}"

human readable with commas: 1,000,000.0

Does this already exist and, if not, any feedback (method name,
suitability) for its addition?
Thank you!
-r

--
Posted via http://www.ruby-forum.com/\.

3

John Feminella wrote in post #980950:

Try this:

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

I like the method name...any feedback on whether or not this should be
in core? (my inclination is yes...)
-r

···

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4

How about supporting extended sprintf syntax? From the manpage:

       The five flag characters above are defined in the C standard.
The
       SUSv2 specifies one further flag character.

       ' For decimal conversion (i, d, u, f, F, g, G) the output is
to be
              grouped with thousands' grouping characters if the locale
infor‐
              mation indicates any. Note that many versions of gcc(1)
cannot
              parse this option and will issue a warning. SUSv2
does not
              include %'F.

i.e. "%'d" % 12345678

···

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