number_with_delimiter method? (thousands separators)

[ghost]

I searched for some time in the API docs and in the source code but could not find a function to format numbers with thousands separators (something like Rails' number_to_delimiter helper).

I'm using this snippet for now (which I adapted from ActiveSupport's source code):

def number_with_separator(number)
  sprintf("%0.2f", number).gsub(/(\d)(?=(\d\d\d)+(?!\d))/, "\\1,")
end

number_with_separator 12345678.09
# => "12,345,678.09"

I wonder if something like that shouldn't be included in the standard lib?

[hugoabonizio]

I think this belongs to a i18n shard, it's useful for presentations but it differs between localizations.

[RX14]

Should Int#to_s go in a shard because it uses . as a decimal separator? Perhaps providing the very most common format in the stdlib and leaving others to implement i18n if required would be the best.

[hugoabonizio]

I'm actually referring to thousands separator ,, for decimal separator there already is just sprintf("%0.2f", number).

[straight-shoota]

Yeah this is related to i18n but the implementation of the formatter itself could very well be in the standard library. It just needs to be configureable as to which characters to use as thousands delimiter and decimal separator.
A i18n shard could just wrap that method providing these characters based on a locale.

[hugoabonizio]

Could use _ as default separator (12_345_678.09) to feel more natural, the language itself has this construction.

[straight-shoota]

Resolved by #6314

[HertzDevil]

Can this be closed now?