RCR feedback: Numeric#grouped

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

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

John F.
Principal Consultant, BitsBuilder
LI: http://www.linkedin.com/in/johnxf
SO: http://stackoverflow.com/users/75170/

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

John F. 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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