function

Type:	-	special form (fsubr)
Source:	-	xlcont.c

Syntax

(function expr)

expr - an expression that evaluates to a function
returns - the functional interpretation

Description

The 'function' special form returns the function definition of the 'expr'. Execution of the 'expr' form does not occur. 'function' will operate on functions, special forms, lambda-expressions and macros.

Examples

(function car)              ; returns #<Subr-CAR: #23ac4>
(function quote)            ; returns #<FSubr-QUOTE: #23d1c>
#'quote                     ; returns #<FSubr-QUOTE: #23d1c>
(function 'cdr)             ; error: not a function

(defun foo (x) (+ x x))     ; define FOO function
(function foo)              ; returns #<Closure-FOO: #2cfb6>

(defmacro bar (x) (+ x x))  ; define FOOMAC macro
(function bar)              ; returns #<Closure-BAR: #2ceee>

(setq my 99)                ; define a variable MY
(function my)               ; error: unbound function

(defun my (x) (print x))    ; define a function MY
(function my)               ; returns #<Closure-MY: #2cdd6>

Read macro: XLISP supports the normal Lisp read macro of a hash and quote [#'] as a short-hand method of writing the 'function' special form.

See the function special form in the XLISP 2.0 manual.

  Back to Top