Functions

(let* ((x 2) (f #'(lambda (z) x))) (let ((x "bye")) (funcall f (length x))))

• How do we make sure the environment has the (correct) binding for x?

  • We must keep track of the environment at the point where the function was evaluated.
  • Function evaluation: #'(lambda (z) x), not(funcall f (length x))

• We create a closure

  • A pair of a function and its environment

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