Class: AeFastDecimalFormatter

Inherits:
Object
  • Object
show all
Defined in:
lib/ae_fast_decimal_formatter.rb,
lib/ae_fast_decimal_formatter/version.rb

Constant Summary collapse

VERSION = 
'2.1.0'

Class Method Summary collapse

Class Method Details

.format(number, precision) ⇒ Object 



4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
 
# File 'lib/ae_fast_decimal_formatter.rb', line 4

def self.format(number, precision)
  precision = 0 if precision < 0
  precision = 5 if precision > 5

  # We can call to_f on the input to convert variety of types to floats. This is
  # faster than inspecting the type of the input and performing different logic.
  # This is safe as we have a test that verifies we produce the same result for
  # float as we do for BigDecimals (i.e. format_long((num * 10 ** precision).round, precision)).
  #
  # In order to round correct, it looks like we need the two sets of rounds. For example,
  # (148.855 * 100).round.to_i -> 14885 seems incorrect, so we try,
  # (148.855.round(2) * 100).to_i -> 14886 but then,
  # (1234567890.12.round(2) * 100).to_i -> 123456789011 which is definitely not correct.
  #
  # Thus the two rounds.
  format_long((number.to_f.round(precision) * 10 ** precision).round, precision)
end