Expressions
Atoms
Null
null
Boolean
true
false
Number
All numbers in Rimu are "Big" Decimals (opens in a new tab), not floats or integers.
10
10.99
String
"hello world"
Escape quotes within strings to represent them literally.
"they said \"hello world\""
Function
(a, b) => a + b
Identifier
Identifiers must conform to regex:
^[a-zA-Z_][a-zA-Z0-9_]*$
hello
Collections
List
["hello", null, "world"]
Object
Unquoted keys must conform to Identifier regex:
^[a-zA-Z_][a-zA-Z0-9_]*$Quoted keys can be any valid Unicode.
{ a: "apple", b: "bear" }
{ "a": "apple", "b": "bear" }
Operators
Unary
Operand must be a number.
- (negate)
-10
! (not)
Operand must be a boolean.
!is_done
Binary
+ (add)
Operands must be numbers, strings, or lists.
10 + 2
"hello" + "world"
[1, 2] + [3, 4]
- (subtract)
Operands must be numbers.
10 - 2
* (multiply)
Operands must be numbers.
10 * 2
/ (divide)
Operands must be numbers.
10 / 2
> (greater than)
Operands must be numbers.
10 > 2
>= (greater than or equal)
Operands must be numbers.
10 >= 2
< (less than)
Operands must be numbers.
10 < 2
<= (less than or equal)
Operands must be numbers.
10 <= 2
== (equal)
true == false
!= (not equal)
true != false
&& (and)
true && false
|| (or)
true || false
^ (xor)
Operands must be booleans.
true ^ false
% (remainder)
Operands must be numbers.
10 % 2
Call
Value being called must be a function.
add(1, 2)
Get Index
Container must be list or string or object.
list[2]
list[-2]
string[2]
object["a"]
Get Key
Container must be object
object.a
Get Slice
Container must be list or string.
list[2:5]
string[2:5]
Notes
Truthiness
Everything is truthy except false and null.
Orderedness
Only numbers are ordered.
No statements
Every expression is evaluated to a value.
No type coercion
No implicit type coercions.
For example, the following is an error:
2 + "pies"