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class Grant
include Enumerable
attr_reader :issued_at
def initialize(value_of_grant, share_price, date = Clock.today)
number_of_units = value_of_grant / share_price
@units = Array.new(number_of_units) { Unit.new }
@issued_at = date
end
def vest_at(price, portion)
number_of_units_to_vest = portion.to_f * @units.count
unvested_units.take(number_of_units_to_vest).each do |unit|
unit.vest_at(price)
end
end
def each
@units.each { |unit| yield unit }
end
def value_of(units, price)
units.inject(0.00.dollars) do |memo, unit|
memo + (unit * price)
end
end
private
def unvested_units
@units - vested_units
end
def vested_units
@units.find_all { |x| x.vested? }
end
end
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