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module SalesReporter
class Sale
attr_reader :date, :amount, :quantity
def initialize(date_, amount, quantity)
@date = sanitize_date(date_)
raise TypeError('sanitize failed') unless @date.is_a? Date
@amount = amount
@quantity = quantity
end
private
def sanitize_date(d)
case d.class.to_s
when "String"
return Date.parse(d)
when "Date"
return d
else
raise TypeError.new('Expected date argument to be of type Date or String')
end
end
end
end
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