[ruby-core:93841] [Ruby master Feature#16011] Digit grouping

Issue #16011 has been updated by shyouhei (Shyouhei Urabe).


```ruby
class Integer
  def delimited(n)
    div, mod = n.divmod(3)
    return (                        \
      digits(1000).lazy + [0].cycle \
    ) . first(div + 1)              \
      . reverse                     \
      . map {|i| '%03d' % i }       \
      . join(',')                   \
      . sub(/\A\d{#{3-mod}},?/, '')
  end
end


1234.delimited(8) #=> "0,001,234"
```

----------------------------------------
Feature #16011: Digit grouping
https://bugs.ruby-lang.org/issues/16011#change-79725

* Author: svnpenn (Steven Penny)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
Ruby seems to have no way to format a number with grouped thousands. I see Rails
has an option:

    require 'active_support/all'
    1234.to_s(:delimited)

However in this case it seems that grouping cannot be combined with say, leading
zeros:

https://github.com/rails/rails/issues/36707

This is quite simple with other languages, for example JavaScript:

    (1234).toLocaleString(0, {minimumIntegerDigits: 7});
    "0,001,234"

Python:

    >>> format(1234, '08,')
    '0,001,234'

Go:

    package main
    import "golang.org/x/text/language"
    import "golang.org/x/text/message"
    func main() {
       message.NewPrinter(language.English).Printf("%07d\n", 1234)
       // 0,001,234
    }



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