Operators

Arithmetic operators¶

These arithmetic operators are used as infix operators:

Examples:

30 + 2
10 / 6
10.0 / 6.0
-10 % 6

Unary negation uses prefix -.

-2
- (-3.1: float64)

Comparison operators¶

These comparison operators return bool:

Examples:

30: int64 == 30
2 < 3: int64
"aa" >= "ab"

Boolean operators¶

Boolean operators use these forms:

Examples:

!false
false && true
true || false

The pipe operator¶

The pipe operator | passes the left-hand value as the first argument to the right-hand side.

4: int32 | std::add(1)
[1, 2, 3]: [int32] | std::map(x -> x * 2)

Unlike the operators listed earlier, | is not arithmetic or boolean. It is a pipeline operator used to express left-to-right data flow.

Operator precedence¶

From tighter to looser precedence:

1. Prefix unary operators: -, !
2. Multiplicative operators: *, /, %
3. Additive operators: +, -
4. Comparison operators: ==, !=, <, <=, >, >=
5. Boolean &&
6. Boolean ||
7. Pipe |

Use parentheses when you want to make grouping explicit.

Relationship to the standard library¶

Most symbolic operators correspond to standard library functions. For example:

• + corresponds to std::add
• == corresponds to std::eq
• ! corresponds to std::not

The operator syntax is the source-level shorthand.

See also¶

• Expressions
• Types