Operators
- Table of Operators
- Precedence

Operators

There is no operator overloading. When you see an operator in Zig, you know that it is doing something from this table, and nothing else.

Table of Operators

Syntax	Relevant Types	Description	Example
`a + b` `a += b`	Integers Floats	Addition. Can cause overflow for integers. Invokes Peer Type Resolution for the operands. See also @addWithOverflow.	`2 + 5 == 7`
`a +% b` `a +%= b`	Integers	Wrapping Addition. Guaranteed to have twos-complement wrapping behavior. Invokes Peer Type Resolution for the operands. See also @addWithOverflow.	`@as(u32, std.math.maxInt(u32)) +% 1 == 0`
`a - b` `a -= b`	Integers Floats	Subtraction. Can cause overflow for integers. Invokes Peer Type Resolution for the operands. See also @subWithOverflow.	`2 - 5 == -3`
`a -% b` `a -%= b`	Integers	Wrapping Subtraction. Guaranteed to have twos-complement wrapping behavior. Invokes Peer Type Resolution for the operands. See also @subWithOverflow.	`@as(u32, 0) -% 1 == std.math.maxInt(u32)`
`-a`	Integers Floats	Negation. Can cause overflow for integers.	`-1 == 0 - 1`
`-%a`	Integers	Wrapping Negation. Guaranteed to have twos-complement wrapping behavior.	`-%@as(i32, std.math.minInt(i32)) == std.math.minInt(i32)`
`a b` `a = b`	Integers Floats	Multiplication. Can cause overflow for integers. Invokes Peer Type Resolution for the operands. See also @mulWithOverflow.	`2 5 == 10`
`a % b` `a %= b`	Integers	Wrapping Multiplication. Guaranteed to have twos-complement wrapping behavior. Invokes Peer Type Resolution for the operands. See also @mulWithOverflow.	`@as(u8, 200) % 2 == 144`
`a / b` `a /= b`	Integers Floats	Division. Can cause overflow for integers. Can cause Division by Zero for integers. Can cause Division by Zero for floats in FloatMode.Optimized Mode. For non-compile-time-known signed integers, must use @divTrunc, @divFloor, or @divExact instead of `/`. Invokes Peer Type Resolution for the operands.	`10 / 5 == 2`
`a % b` `a %= b`	Integers Floats	Remainder Division. Can cause Division by Zero for integers. Can cause Division by Zero for floats in FloatMode.Optimized Mode. For non-compile-time-known signed integers, must use @rem or @mod instead of `%`. Invokes Peer Type Resolution for the operands.	`10 % 3 == 1`
`a << b` `a <<= b`	Integers	Bit Shift Left. `b` must be comptime-known or have a type with log2 number of bits as `a`. See also @shlExact. See also @shlWithOverflow.	`1 << 8 == 256`
`a >> b` `a >>= b`	Integers	Bit Shift Right. `b` must be comptime-known or have a type with log2 number of bits as `a`. See also @shrExact.	`10 >> 1 == 5`
`a & b` `a &= b`	Integers	Bitwise AND. Invokes Peer Type Resolution for the operands.	`0b011 & 0b101 == 0b001`
`a \| b` `a \|= b`	Integers	Bitwise OR. Invokes Peer Type Resolution for the operands.	`0b010 \| 0b100 == 0b110`
`a ^ b` `a ^= b`	Integers	Bitwise XOR. Invokes Peer Type Resolution for the operands.	`0b011 ^ 0b101 == 0b110`
`~a`	Integers	Bitwise NOT.	`~@as(u8, 0b10101111) == 0b01010000`
`a orelse b`	Optionals	If `a` is `null`, returns `b` (“default value”), otherwise returns the unwrapped value of `a`. Note that `b` may be a value of type noreturn.	`const value: ?u32 = null;` `const unwrapped = value orelse 1234;` `unwrapped == 1234`
`a.?`	Optionals	Equivalent to: `a orelse unreachable`	`const value: ?u32 = 5678;` `value.? == 5678`
`a catch b` `a catch \|err\| b`	Error Unions	If `a` is an `error`, returns `b` (“default value”), otherwise returns the unwrapped value of `a`. Note that `b` may be a value of type noreturn. `err` is the `error` and is in scope of the expression `b`.	`const value: anyerror!u32 = error.Broken;` `const unwrapped = value catch 1234;` `unwrapped == 1234`
`a and b`	bool	If `a` is `false`, returns `false` without evaluating `b`. Otherwise, returns `b`.	`(false and true) == false`
`a or b`	bool	If `a` is `true`, returns `true` without evaluating `b`. Otherwise, returns `b`.	`false or true == true`
`!a`	bool	Boolean NOT.	`!false == true`
`a == b`	Integers Floats bool type	Returns `true` if a and b are equal, otherwise returns `false`. Invokes Peer Type Resolution for the operands.	`(1 == 1) == true`
`a == null`	Optionals	Returns `true` if a is `null`, otherwise returns `false`.	`const value: ?u32 = null;` `value == null`
`a != b`	Integers Floats bool type	Returns `false` if a and b are equal, otherwise returns `true`. Invokes Peer Type Resolution for the operands.	`(1 != 1) == false`
`a > b`	Integers Floats	Returns `true` if a is greater than b, otherwise returns `false`. Invokes Peer Type Resolution for the operands.	`(2 > 1) == true`
`a >= b`	Integers Floats	Returns `true` if a is greater than or equal to b, otherwise returns `false`. Invokes Peer Type Resolution for the operands.	`(2 >= 1) == true`
`a < b`	Integers Floats	Returns `true` if a is less than b, otherwise returns `false`. Invokes Peer Type Resolution for the operands.	`(1 < 2) == true`>
`a <= b`	Integers Floats	Returns `true` if a is less than or equal to b, otherwise returns `false`. Invokes Peer Type Resolution for the operands.	`(1 <= 2) == true`
`a ++ b`	Arrays	Array concatenation. Only available when `a` and `b` are compile-time known.	`const mem = @import(“std”).mem;` `const array1 = []u32{1,2};` `const array2 = []u32{3,4};` `const together = array1 ++ array2;` `mem.eql(u32, &together, &[_]u32{1,2,3,4})`
`a b`	Arrays	Array multiplication. Only available when `a` and `b` are compile-time known.	`const mem = @import(“std”).mem;` `const pattern = “ab” 3;` `mem.eql(u8, pattern, “ababab”)`
`a.`	Pointers	Pointer dereference.	`const x: u32 = 1234;` `const ptr = &x;` `ptr. == 1234`
`&a`	All types	Address of.	`const x: u32 = 1234;` `const ptr = &x;` `ptr.* == 1234`
`a \|\| b`	Error Set Type	Merging Error Sets	`const A = error{One};` `const B = error{Two};` `(A \|\| B) == error{One, Two}`

Precedence

x() x[] x.y
a!b
!x -x -%x ~x &x ?x
x{} x.* x.?
! * / % ** *% ||
+ - ++ +% -%
<< >>
& ^ |
== != < > <= >=
and
or
orelse catch
= *= /= %= += -= <<= >>= &= ^= |=