© Gary D. Knott 2017

Gary D. Knott, Interpreting LISP, 10.1007/978-1-4842-2707-7_21

21. More Functions

Gary D. Knott1 

(1)Civilized Software Inc., Silver Spring, Maryland, USA

This chapter discusses more functions and special forms.

  • SUM: function with a varying number of arguments

    v[(SUM n 1 n 2 … n k )] = v[(PLUS n 1 (PLUS n 2 ( … (PLUS n k 0)) … ))].

  • PRODUCT: function with a varying number of arguments

    v[(PRODUCT n 1 n 2 … n k )] = v[(TIMES n 1 (TIMES n 2 (…(TIMES n k 1)) … ))].

  • DO: function with a varying number of arguments

    v[(DO x 1 x 2 … x k )] = v[x k ].

    Since DO is a function, its arguments are all evaluated from left to right, and the last argument value is then returned. This function is useful when its arguments ...

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