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12 Functions ************ A Lisp program is composed mainly of Lisp functions. This chapter explains what functions are, how they accept arguments, and how to define them.
· What Is a Function Lisp functions vs. primitives; terminology.
· Lambda Expressions How functions are expressed as Lisp objects.
· Function Names A symbol can serve as the name of a function.
· Defining Functions Lisp expressions for defining functions.
· Calling Functions How to use an existing function.
· Mapping Functions Applying a function to each element of a list, etc.
· Anonymous Functions Lambda expressions are functions with no names.
· Generic Functions Polymorphism, Emacs-style.
· Function Cells Accessing or setting the function definition
of a symbol.
· Closures Functions that enclose a lexical environment.
· Advising Functions Adding to the definition of a function.
· Obsolete Functions Declaring functions obsolete.
· Inline Functions Functions that the compiler will expand inline.
· Declare Form Adding additional information about a function.
· Declaring Functions Telling the compiler that a function is defined.
· Function Safety Determining whether a function is safe to call.
· Related Topics Cross-references to specific Lisp primitives
that have a special bearing on how functions work.