Module: UmbrellioUtils::Rounding

Extended by:
Rounding
Included in:
Rounding
Defined in:
lib/umbrellio_utils/rounding.rb

Constant Summary collapse

SUPER_ROUND_DEFAULT_TARGETS = 
[1.0, 1.5, 2.5, 5.0, 10.0].freeze

Instance Method Summary collapse

Instance Method Details

#fancy_round(number, rounding_method: :round, ugliness_level: 1) ⇒ Object 



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# File 'lib/umbrellio_utils/rounding.rb', line 9

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, targets: SUPER_ROUND_DEFAULT_TARGETS) ⇒ Object 



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# File 'lib/umbrellio_utils/rounding.rb', line 16

def super_round(number, rounding_method: :round, targets: SUPER_ROUND_DEFAULT_TARGETS)
  return 0 unless number.positive?

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

  best_diff = best_target = nil

  targets.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