Simply Scheme: Introducing Computer Science 2/e Copyright (C) 1999 MIT

Alphabetical Table of Scheme Primitives

Brian Harvey University of California, Berkeley Matthew Wright University of California, Santa Barbara Download PDF version Back to Table of Contents BACK chapter thread NEXT MIT Press web page for Simply Scheme

This table does not represent the complete Scheme language. It includes the nonstandard Scheme primitives that we use in this book, and it omits many standard ones that are not needed here.

'	Abbreviation for (quote …).
*	Multiply numbers.
+	Add numbers.
-	Subtract numbers.
/	Divide numbers.
<	Is the first argument less than the second?
<=	Is the first argument less than or equal to the second?
=	Are two numbers equal? (Like equal? but works only for numbers).
>	Is the first argument greater than the second?
>=	Is the first argument greater than or equal to the second?
abs	Return the absolute value of the argument.
accumulate	Apply a combining function to all elements (see here).
align	Return a string spaced to a given width (see here).
and	(Special form) Are all of the arguments true values (i.e., not #f)?
appearances	Return the number of times the first argument is in the second.
append	Return a list containing the elements of the argument lists.
apply	Apply a function to the arguments in a list.
assoc	Return association list entry matching key.
before?	Does the first argument come alphabetically before the second?
begin	(Special form) Carry out a sequence of instructions (see here).
bf	Abbreviation for butfirst.
bl	Abbreviation for butlast.
boolean?	Return true if the argument is #t or #f.
butfirst	Return all but the first letter of a word, or word of a sentence.
butlast	Return all but the last letter of a word, or word of a sentence.
c...r	Combinations of car and cdr (see here).
car	Return the first element of a list.
cdr	Return all but the first element of a list.
ceiling	Round a number up to the nearest integer.
children	Return a list of the children of a tree node.
close-all-ports	Close all open input and output ports.
close-input-port	Close an input port.
close-output-port	Close an output port.
cond	(Special form) Choose among several alternatives (see here).
cons	Prepend an element to a list.
cos	Return the cosine of a number (from trigonometry).
count	Return the number of letters in a word or number of words in a sentence.
datum	Return the datum of a tree node.
define	(Special form) Create a global name (for a procedure or other value).
display	Print the argument without starting a new line.
empty?	Is the argument empty, i.e., the empty word "" or the empty sentence ()?
eof-object?	Is the argument an end-of-file object?
equal?	Are the two arguments the same thing?
error	Print an error message and return to the Scheme prompt.
even?	Is the argument an even integer?
every	Apply a function to each element of a word or sentence (see here).
expt	Raise the first argument to the power of the second.
filter	Select a subset of a list (see here).
first	Return first letter of a word, or first word of a sentence.
floor	Round a number down to the nearest integer.
for-each	Perform a computation for each element of a list.
if	(Special form) Choose between two alternatives (see here).
integer?	Is the argument an integer?
item	Return the $n$th letter of a word, or $n$th word of a sentence.
keep	Select a subset of a word or sentence (see here).
lambda	(Special form) Create a new procedure (see Chapter \lambchop).
last	Return last letter of a word, or last word of a sentence.
length	Return the number of elements in a list.
let	(Special form) Give temporary names to values (see here).
list	Return a list containing the arguments.
list->vector	Return a vector with the same elements as the list.
list-ref	Select an element from a list (counting from zero).
list?	Is the argument a list?
load	Read a program file into Scheme.
log	Return the logarithm of a number.
make-node	Create a new node of a tree.
make-vector	Create a new vector of the given length.
map	Apply a function to each element of a list (see here).
max	Return the largest of the arguments.
member	Return subset of a list starting with selected element, or #f.
member?	Is the first argument an element of the second? (see here).
min	Return the smallest of the arguments.
newline	Go to a new line of printing.
not	Return #t if argument is #f; return #f otherwise.
null?	Is the argument the empty list?
number?	Is the argument a number?
odd?	Is the argument an odd integer?
open-input-file	Open a file for reading, return a port.
open-output-file	Open a file for writing, return a port.
or	(Special form) Are any of the arguments true values (i.e., not #f)?
procedure?	Is the argument a procedure?
quote	(Special form) Return the argument, unevaluated (see here).
quotient	Divide numbers, but round down to integer.
random	Return a random number ≥ 0 and smaller than the argument.
read	Read an expression from the keyboard (or a file).
read-line	Read a line from the keyboard (or a file), returning a sentence.
read-string	Read a line from the keyboard (or a file), returning a string.
reduce	Apply a combining function to all elements of list (see here).
remainder	Return the remainder from dividing the first number by the second.
repeated	Return the function described by f(f(⋅⋅⋅(f(x)))) (see here).
round	Round a number to the nearest integer.
se	Abbreviation for sentence.
sentence	Join the arguments together into a big sentence.
sentence?	Is the argument a sentence?
show	Print the argument and start a new line.
show-line	Show the argument sentence without surrounding parentheses.
sin	Return the sine of a number (from trigonometry).
sqrt	Return the square root of a number.
square	Not a primitive! (define (square x) (* x x))
trace	Report on all future invocations of a procedure.
untrace	Undo the effect of trace.
vector	Create a vector with the arguments as elements.
vector->list	Return a list with the same elements as the vector.
vector-length	Return the number of elements in a vector.
vector-ref	Return an element of a vector (counting from zero).
vector-set!	Replace an element in a vector.
vector?	Is the argument a vector?
vowel?	Not a primitive! (define (vowel? x) (member? x '(a e i o u)))
word	Joins words into one big word.
word?	Is the argument a word? (Note: numbers are words.)
write	Print the argument in machine-readable form (see here).

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