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Programming in Emacs Lisp

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3. How To Write Function Definitions

When the Lisp interpreter evaluates a list, it looks to see whether the first symbol on the list has a function definition attached to it; or, put another way, whether the symbol points to a function definition. If it does, the computer carries out the instructions in the definition. A symbol that has a function definition is called, simply, a function (although, properly speaking, the definition is the function and the symbol refers to it.)

An Aside about Primitive Functions  
3.1 The defun Special Form  The defun special form.
3.2 Install a Function Definition  Install a function definition.
3.3 Make a Function Interactive  Making a function interactive.
3.4 Different Options for interactive  Different options for interactive.
3.5 Install Code Permanently  Installing code permanently.
3.6 let  Creating and initializing local variables.
3.7 The if Special Form  What if?
3.8 If--then--else Expressions  If--then--else expressions.
3.9 Truth and Falsehood in Emacs Lisp  What Lisp considers false and true.
3.10 save-excursion  Keeping track of point, mark, and buffer.
3.11 Review  
3.12 Exercises  

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