Expressions and operators

Assignment, arithmetic, bitwise and logical operations, casts, increment/decrement, and operator precedence.

Wave Foundation

Main operators

Category Operators
Arithmetic +, -, *, /, %
Comparison ==, !=, <, <=, >, >=
Logical &&, `
Bitwise &, |, ^, ~, <<, >>
Assignment =, +=, -=, *=, /=, %=
Increment/decrement ++, --
Address/dereference &value, deref pointer
Explicit cast as 
var width: i32 = 12;
var area: i32 = width * 8;
var large: bool = area >= 64;
var widened: i64 = area as i64;
area += 8;

Precedence

Operators bind from tighter to looser in this order:

  1. Primary and postfix operations: calls, field access, indexing, postfix ++ and --
  2. Unary operations: !, ~, &, deref, prefix ++ and --, unary + and -
  3. as casts
  4. *, /, %
  5. +, -
  6. <<, >>
  7. <, <=, >, >=
  8. ==, !=
  9. Bitwise &, ^, |
  10. &&, ||
  11. Assignment and compound assignment

Assignment is right-associative, so chained assignments are evaluated from right to left. Use parentheses when mixing operators would make intent unclear.

Assignable targets

Assignment and ++/-- operate on storage locations such as variables, fields, indexed elements, and dereferenced pointers. Writes to const values are not allowed.