Important Lisp Primitives

These are among the most useful primitives in MzScheme, the Scheme dialect of Dr. Scheme. Some of these primitives have different names in other dialects. By convention, symbols ending in "?" are predicate names and symbols containing "->" refer to type conversion operations. Those ending in "!" refer to destructive operations (mutators). Symbols that are italicized require loading a library before using them.

NUMBERS

+ - * / quotient remainder modulo

abs max min floor truncate ceiling round

number? complex? real? integer? rational? exact? inexact?

= < > <= >= numerator denominator

add1 sub1 zero? positive? negative? odd? even?

sqrt exp log expt gcd lcm random

BOOLEANS AND EQUIVALENCE PREDICATES

#t #f not eq? equal? eqv? and or

SEQUENCING, CONTROL, AND BINDING

define if cond eval quote begin begin0

lambda let do when unless case

let* letrec set! define-macro force delay

PAIRS AND LISTS

car cdr cons c..r null? pair? list?

list append reverse length list-ref list-tail last-pair

member memq memv assoc assq assv

set-car! set-cdr! append! reverse!

INPUT, OUTPUT, AND PORTS

open-input-file close-input-port open-output-file close-output-port
read read-char read-line eof-object? load

write write-char newline print display pretty-print

PROCEDURES

apply map for-each procedure?

CHARACTERS

char? char-upcase char-downcase char->integer integer->char

char-alphabetic? char-numeric? char-whitespace? char-upper-case? char-lower-case?

char=? char<? char>? char<=? char>=?

char-ci=? char-ci<? char-ci>? char-ci<=? char-ci>=?

SYMBOLS AND STRINGS

symbol? gensym symbol->string string->symbol putprop getprop

string? string make-string string-length string-append string-ref substring

string=? string<? string>? string<=? string>=?

string-ci=? string-ci<? string-ci>? string-ci<=? string-ci>=?

list->string string->list number->string string->number string-set! string-copy string-fill!

VECTORS

vector? vector make-vector list->vector vector->list vector-length vector-ref

vector-set! vector-fill!

MISCELLANEOUS

define-struct exit error system require trace untrace

NUMBERS
+	-	*	/	quotient	remainder	modulo
abs	max	min	floor	truncate	ceiling	round
number?	complex?	real?	integer?	rational?	exact?	inexact?
=	<	>	<=	>=	numerator	denominator
add1	sub1	zero?	positive?	negative?	odd?	even?
sqrt	exp	log	expt	gcd	lcm	random
BOOLEANS AND EQUIVALENCE PREDICATES
#t	#f	not	eq?	equal?	eqv?	and	or
SEQUENCING, CONTROL, AND BINDING
define	if	cond	eval	quote	begin	begin0
lambda	let	do	when	unless	case
let*	letrec	set!	define-macro	force	delay
PAIRS AND LISTS
car	cdr	cons	c..r	null?	pair?	list?
list	append	reverse	length	list-ref	list-tail	last-pair
member	memq	memv	assoc	assq	assv
set-car!	set-cdr!	append!	reverse!
INPUT, OUTPUT, AND PORTS
open-input-file	close-input-port	open-output-file	close-output-port
read	read-char	read-line	eof-object?	load
write	write-char	newline	print	display	pretty-print
PROCEDURES
apply	map	for-each	procedure?
CHARACTERS
char?	char-upcase	char-downcase	char->integer	integer->char
char-alphabetic?	char-numeric?	char-whitespace?	char-upper-case?	char-lower-case?
char=?	char<?	char>?	char<=?	char>=?
char-ci=?	char-ci<?	char-ci>?	char-ci<=?	char-ci>=?
SYMBOLS AND STRINGS
symbol?	gensym	symbol->string	string->symbol	putprop	getprop
string?	string	make-string	string-length	string-append	string-ref	substring
string=?	string<?	string>?	string<=?	string>=?
string-ci=?	string-ci<?	string-ci>?	string-ci<=?	string-ci>=?
list->string	string->list	number->string	string->number	string-set!	string-copy	string-fill!
VECTORS
vector?	vector	make-vector	list->vector	vector->list	vector-length	vector-ref
vector-set!	vector-fill!
MISCELLANEOUS
define-struct	exit	error	system	require	trace	untrace