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GNU Emacs Lisp Reference Manual

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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.

12.1 What Is a Function?  Lisp functions vs. primitives; terminology.
12.2 Lambda Expressions  How functions are expressed as Lisp objects.
12.3 Naming a Function  A symbol can serve as the name of a function.
12.4 Defining Functions  Lisp expressions for defining functions.
12.5 Calling Functions  How to use an existing function.
12.6 Mapping Functions  Applying a function to each element of a list, etc.
12.7 Anonymous Functions  Lambda expressions are functions with no names.
12.8 Accessing Function Cell Contents  Accessing or setting the function definition of a symbol.
12.9 Inline Functions  Defining functions that the compiler will open code.
12.10 Other Topics Related to Functions  Cross-references to specific Lisp primitives that have a special bearing on how functions work.

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  Copyright 2003   by The Free Software Foundation     Updated Jun 2003