Info Catalog eintr: Practicing Evaluation eintr: Top eintr: Buffer Walk Through

eintr: Writing Defuns

 
 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.)
 

Menu

 
· Primitive Functions
· defun                        The ‘defun’ macro.
· Install                      Install a function definition.
· Interactive                  Making a function interactive.
· Interactive Options          Different options for ‘interactive’.
· Permanent Installation       Installing code permanently.
· let                          Creating and initializing local variables.
· if                           What if?
· else                         If–then–else expressions.
· Truth & Falsehood            What Lisp considers false and true.
· save-excursion               Keeping track of point and buffer.
· Review
· defun Exercises
 

Info Catalog eintr: Practicing Evaluation eintr: Top eintr: Buffer Walk Through