Does Ruby have any number formatting classes?

Question

Does Ruby have any Formatter classes or methods that can be used to format numbers for things like currency, etc., or are there any gems that do this, or do you have to writ

Answer 1

You can use Kernel#sprintf (or Kernel#format) and do it that way. API Link.

Answer 2

Try this:

1234567890.123.to_s.reverse.gsub(/(\d{3})(?=\d)/, '\\1,').reverse
=> "1,234,567,890.123"

Taken from a comment by @pguardiario in a similar thread

Answer 3

Ruby has all the standard print formatters, available either via printf, sprintf or using 'formatstring' % [var1, ...].

>> '%.2f' % 3.14159 #=> "3.14"
>> '%4s %-4s' % ['foo', 'bar'] #=> " foo bar "

Answer 4

You can check out the ruby on rails ActionView::Helpers::NumberHelper