module UmbrellioUtils::Rounding

Public Instance Methods

fancy_round(number, rounding_method: :round, ugliness_level: 1) click to toggle source
# File lib/umbrellio_utils/rounding.rb, line 7
def fancy_round(number, rounding_method: :round, ugliness_level: 1)
  return 0 unless number.positive?
  log = Math.log(number, 10).floor
  coef = 2**ugliness_level
  (number * coef).public_send(rounding_method, -log) / coef.to_f
end
super_round(number, rounding_method: :round) click to toggle source
# File lib/umbrellio_utils/rounding.rb, line 14
def super_round(number, rounding_method: :round)
  return 0 unless number.positive?

  coef = 10**Math.log(number, 10).floor
  num = number / coef.to_f

  best_diff = best_target = nil

  [1.0, 1.5, 2.5, 5.0, 10.0].each do |target|
    diff = target - num

    next if rounding_method == :ceil && diff.negative?
    next if rounding_method == :floor && diff.positive?

    if best_diff.nil? || diff.abs < best_diff
      best_diff = diff.abs
      best_target = target
    end
  end

  (best_target.to_d * coef).to_f
end