Method: NaiveCalculator::Environment#lookup_function

Defined in:
lib/naive_calculator/environment.rb

#lookup_function(name, arity) ⇒ Object 



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# File 'lib/naive_calculator/environment.rb', line 40

def lookup_function(name, arity)
  function = @functions[name]

  raise "No function `#{name}`" unless function
  raise "Function `#{name}` takes #{function.arity} argument(s) (#{arity} given)" unless function.arity == arity

  function.body
end