class Money::Allocation
Public Class Methods
generate(amount, parts, whole_amounts = true)
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Splits a given amount in parts without losing pennies. The left-over pennies will be distributed round-robin amongst the parts. This means that parts listed first will likely receive more pennies than the ones listed later.
The results should always add up to the original amount.
The parts can be specified as:
Numeric — performs the split between a given number of parties evenely Array<Numeric> — allocates the amounts proportionally to the given array
# File lib/money/money/allocation.rb, line 15 def self.generate(amount, parts, whole_amounts = true) parts = if parts.is_a?(Numeric) Array.new(parts, 1) elsif parts.all?(&:zero?) Array.new(parts.count, 1) else parts.dup end raise ArgumentError, 'need at least one party' if parts.empty? result = [] remaining_amount = amount until parts.empty? do parts_sum = parts.inject(0, :+) part = parts.pop current_split = 0 if parts_sum > 0 current_split = remaining_amount * part / parts_sum current_split = current_split.truncate if whole_amounts end result.unshift current_split remaining_amount -= current_split end result end