Quick Reference
See the Humus language overview for more detail.
- Define Variable(s)
DEF pattern AS expression- Define Function
DEF name(pattern) AS expression- Create Actor
CREATE name WITH behavior- Send Message
SEND message TO actor- Update Behavior
BECOME behavior- Abort Message-Event Transaction
THROW expression- Execute Statement Block
- expression
- Constant
TRUE, FALSE, NIL, or ?- (Integer) Number
- [
-]digits* or radix#digits*
- Symbol
#name- This Actor
SELF- New Actor
NEW behavior- Pairing and Grouping
1, 2, 3 is equivalent to (1, (2, 3)), and () is NIL- (Lambda) Abstraction
\pattern.expression- (Function) Application
abstraction(expression)- Conditional
CASE value OF pattern : expression ... END- Statement Block
[ statement... ]
- Literal
TRUE, FALSE, NIL, ?, number, or symbol- This Actor
SELF- Variable
- name or
_ to ignore
- Tuple
- pattern
, pattern ...
- Value
$name or $(expression)
println- An actor that receives any message, and prints it to the console
timer- An actor that receives
(dt, msg, actor),
and sends msg to actor after dt milliseconds
random- An actor that receives
(cust, n),
and sends cust a random number from 0 to n-1
eq(value, value)- Value equality produces a boolean
not(boolean)
and(boolean, boolean)
or(boolean, boolean)- Boolean predicates produce a boolean or
?
is_boolean(value)
is_number(value)
is_function(value)
is_actor(value)
is_pair(value)- Type predicates produce a boolean
neg(number)
add(number, number)
sub(number, number)
mul(number, number)
div(number, number)
mod(number, number)- Arithmetic operations produce a number or
?
compare(number, number)- Numeric comparison produces
-1 if <, 0 if =, 1 if >, or ?
less(number, number)
less_equal(number, number)
greater_equal(number, number)
greater(number, number)- Numeric predicates produce a boolean or
?