Simplified Common Lisp reference

Symbol class: Functions, Evaluation, Flow Control, Definitions and Syntax

Syntax:

Symbol type: macro

defparameternameinitial-valuedocumentation^(optional) => an object

Argument description:

name	a name for global variable
initial-value	an expression
documentation	documentation string

DEFPARAMETER defines global variable with dynamic scoping. Usual conventions dictate to make such variables easy to distinguish so their name is surrounded by stars. Value for variable is reevaluated for each occurence (unlike with DEFVAR). See also DEFVAR, LET, SETQ.

(defparameter *my-global-variable* (+ 3 5)) => *MY-GLOBAL-VARIABLE*
*my-global-variable* => 8

Function index Full documentation for defparameter (HyperSpec)