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1 List Processing

To the untutored eye, Lisp is a strange programming language. In Lisp code there are parentheses everywhere. Some people even claim that the name stands for “Lots of Isolated Silly Parentheses”. But the claim is unwarranted. Lisp stands for LISt Processing, and the programming language handles lists (and lists of lists) by putting them between parentheses. The parentheses mark the boundaries of the list. Sometimes a list is preceded by an apostrophe ‘'’, called a single-quote in Lisp.¹ Lists are the basis of Lisp.

• Lisp Lists
• Run a Program
• Generate an Error Message
• Symbol Names and Function Definitions
• The Lisp Interpreter
• Evaluation
• Variables
• Arguments
• Setting the Value of a Variable
• Summary
• Exercises