mirror of
https://github.com/hakanensari/frankfurter.git
synced 2024-11-22 02:52:49 +01:00
24 lines
828 B
Ruby
24 lines
828 B
Ruby
# frozen_string_literal: true
|
|
|
|
module Roundable
|
|
# To paraphrase Wikipedia, most currency pairs are quoted to four decimal
|
|
# places. An exception to this is exchange rates with a value of less than
|
|
# 1.000, which are quoted to five or six decimal places. Exchange rates
|
|
# greater than around 20 are usually quoted to three decimal places and
|
|
# exchange rates greater than 80 are quoted to two decimal places.
|
|
# Currencies over 5000 are usually quoted with no decimal places.
|
|
def round(value)
|
|
if value > 5000
|
|
value.round
|
|
elsif value > 80
|
|
Float(format('%<value>.2f', value: value))
|
|
elsif value > 20
|
|
Float(format('%<value>.3f', value: value))
|
|
elsif value > 1
|
|
Float(format('%<value>.4f', value: value))
|
|
else
|
|
Float(format('%<value>.5f', value: value))
|
|
end
|
|
end
|
|
end
|