class Campa::Lisp::Car
Public Class Methods
new()
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# File lib/campa/lisp/car.rb, line 4 def initialize @printer = Printer.new end
Public Instance Methods
call(list)
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# File lib/campa/lisp/car.rb, line 8 def call(list) return nil if list.nil? || list == List::EMPTY raise illegal_argument(list) if !list.is_a?(List) list.head end
Private Instance Methods
illegal_argument(list)
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# File lib/campa/lisp/car.rb, line 17 def illegal_argument(list) Error::IllegalArgument.new(@printer.call(list), "list") end