Defining Functions with DEFUN

Functions are the primary abstraction mechanism available in Lisp. (Others are structures and macros -- as well as iteration constructs).

Non-built-in Functions are usually defined using the special form DEFUN.

> (defun sqr (x) (* x x))

SQR

> (defun sqr (y)

"Returns the square of its arg."

(* y y) )

SQR

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