SCM Builtins

quote

returns a symbol or list without evaluating it

Allowed number of parameters: 1–1

Parameters

symbol (symbol): symbol to quote

Returns

symbol

eval

executes the given scheme program in the current environment

Allowed number of parameters: 1–1

Parameters

code (list): list with head and optional parameters

Returns

any

size

compute the memory size of a value

Allowed number of parameters: 1–1

Parameters

value (any): value to examine

Returns

int

optimize

optimize the given scheme program

Allowed number of parameters: 1–1

Parameters

code (list): list with head and optional parameters

Returns

any

time

measures the time it takes to compute the first argument

Allowed number of parameters: 1–2

Parameters

code (any): code to execute
label (string): label to print in the log or trace

Returns

any

if

checks a condition and then conditionally evaluates code branches; there might be multiple condition+true-branch clauses

Allowed number of parameters: 2–1000

Parameters

condition... (bool): condition to evaluate
true-branch... (returntype): code to evaluate if condition is true
false-branch (returntype): code to evaluate if condition is false

Returns

returntype

and

returns true if all conditions evaluate to true

Allowed number of parameters: 1–1000

Parameters

condition (bool): condition to evaluate

Returns

bool

or

returns true if at least one condition evaluates to true

Allowed number of parameters: 1–1000

Parameters

condition (any): condition to evaluate

Returns

bool

coalesce

returns the first value that has a non-zero value

Allowed number of parameters: 1–1000

Parameters

value (returntype): value to examine

Returns

returntype

coalesceNil

returns the first value that has a non-nil value

Allowed number of parameters: 1–1000

Parameters

value (returntype): value to examine

Returns

returntype

define

defines or sets a variable in the current environment

Allowed number of parameters: 2–2

Parameters

variable (symbol): variable to set
value (returntype): value to set the variable to

Returns

bool

set

defines or sets a variable in the current environment

Allowed number of parameters: 2–2

Parameters

variable (symbol): variable to set
value (returntype): value to set the variable to

Returns

bool

error

halts the whole execution thread and throws an error message

Allowed number of parameters: 1–1000

Parameters

value... (any): value or message to throw

Returns

string

try

tries to execute a function and returns its result. In case of a failure, the error is fed to the second function and its result value will be used

Allowed number of parameters: 2–2

Parameters

func (func): function with no parameters that will be called
errorhandler (func): function that takes the error as parameter

Returns

any

apply

runs the function with its arguments

Allowed number of parameters: 2–2

Parameters

function (func): function to execute
arguments (list): list of arguments to apply

Returns

any

apply_assoc

runs the function with its arguments but arguments is a assoc list

Allowed number of parameters: 2–2

Parameters

function (func): function to execute (must be a lambda)
arguments (list): assoc list of arguments to apply

Returns

symbol

symbol

returns a symbol built from that string

Allowed number of parameters: 1–1

Parameters

value (string): string value that will be converted into a symbol

Returns

symbol

list

returns a list containing the parameters as alements

Allowed number of parameters: 0–10000

Parameters

value... (any): value for the list

Returns

list

string

converts the given value into string

Allowed number of parameters: 1–1

Parameters

value (any): any value

Returns

string

match

takes a value evaluates the branch that first matches the given pattern

Patterns can be any of:

symbol matches any value and stores is into a variable
"string" (matches only this string)
number (matches only this value)
(symbol "something") will only match the symbol 'something'
'(subpattern subpattern...) matches a list with exactly these subpatterns
(concat str1 str2 str3) will decompose a string into one of the following patterns: "prefix" variable, variable "postfix", variable "infix" variable
(cons a b) will reverse the cons function, so it will match the head of the list with a and the rest with b
(regex "pattern" text var1 var2...) will match the given regex pattern, store the whole string into text and all capture groups into var1, var2...

Allowed number of parameters: 3–10000

Parameters

value (any): value to evaluate
pattern... (any): pattern
result... (returntype): result value when the pattern matches; this code can use the variables matched in the pattern
default (any): (optional) value that is returned when no pattern matches

Returns

any

lambda

returns a function (func) constructed from the given code

Allowed number of parameters: 2–3

Parameters

parameters (symbol|list|nil): if you provide a parameter list, you will have named parameters. If you provide a single symbol, the list of parameters will be provided in that symbol
code (any): value that is evaluated when the lambda is called. code can use the parameters provided in the declaration as well es the scope above
numvars (number): number of unnamed variables that can be accessed via (var 0) (var 1) etc.

Returns

func

begin

creates a own variable scope, evaluates all sub expressions and returns the result of the last one

Allowed number of parameters: 0–10000

Parameters

expression... (any): expressions to evaluate

Returns

any

parallel

executes all parameters in parallel and returns nil if they are finished

Allowed number of parameters: 1–10000

Parameters

expression... (any): expressions to evaluate in parallel

Returns

any

source

annotates the node with filename and line information for better backtraces

Allowed number of parameters: 4–4

Parameters

filename (string): Filename of the code
line (number): Line of the code
column (number): Column of the code
code (returntype): code

Returns

returntype

scheme

parses a scheme expression into a list

Allowed number of parameters: 1–2

Parameters

code (string): Scheme code
filename (string): optional filename

Returns

any

serialize

serializes a piece of code into a (hopefully) reparsable string; you shall be able to send that code over network and reparse with (scheme)

Allowed number of parameters: 1–1

Parameters

code (list): Scheme code

Returns

string