Operators

Zephyr supports a standard set of operators for arithmetic, comparison, logic, and assignment.

Arithmetic Operators

Operator	Description	Example
+	Addition	a + b
-	Subtraction	a - b
*	Multiplication	a * b
/	Division	a / b
%	Modulo	a % b
-	Unary negation	-a

Comparison Operators

Comparison operators evaluate to a bool value.

Operator	Description
==	Equality
!=	Inequality
<	Less than
<=	Less than or equal
>	Greater than
>=	Greater than or equal

Logical Operators

Operator	Description
&&	Logical AND (Short-circuits)
`
!	Logical NOT

&& and || short-circuit.

Assignment

Operator	Equivalent
=	Assignment
+=	a = a + b
-=	a = a - b
*=	a = a * b
/=	a = a / b

mut x = 10;
x += 5;    // 15
x *= 2;    // 30

Optional chaining (?.)

?. short-circuits to nil when the left side is nil instead of raising an error.

let name = user?.profile?.name;

If any step is nil, the entire expression evaluates to nil rather than trapping.

Error propagation (?)

? propagates Err from a Result<T> expression, returning early from the enclosing function.

fn load() -> Result<string> {
    let content = read_file("data.json")?;
    return Ok(content);
}

Operator precedence (high → low)

Level	Operators
7	!, unary -
6	*, /, %
5	+, -
4	<, <=, >, >=
3	==, !=
2	&&
1	||
0	=, +=, -=, *=, /=

Use parentheses to override precedence:

let result = (a + b) * c;