Operators

The operators of JSX are the same to those in JavaScript (ECMA-262 3rd edition) except for the following changes.

• types of the operands accepted by the operators are more restrictive
• logical operators (&& ||) return boolean
• binary ?: operator has been introduced (to cover the use of || in JavaScript to return non-boolean values)
• introduction of the as operator
• delete is a statement instead of an operator
• a wrapper object (Boolean, Number, String) cannot become a left-hand-side expression

The table below lists the operators supported by JSX.

List of Operators by Precedence

Operator	Returned Type	Operand Type(s)	Note
(x)	typeof x		grouping operator
(...)	returned type of the called function		function call
x.property	typeof x.property	x:Object
array[index]	Nullable.<T>	array: Array.<T>, index: number
map[key]	Nullable.<T>	map: Map.<T>, key: string
x++	typeof x	number or int
x--	typeof x	number or int
x instanceof y	boolean	x: Object, y: Class, Interface, Mixin
x as type	type		cast operator
x as __noconvert__ type	type		cast operator (without run-time type check)
++x	typeof x	number or int
--x	typeof x	number or int
+x	typeof x	number or int
-x	typeof x	number or int
~x	int	number or int
! x	boolean	any
typeof x	boolean	variant
x * y	number or int	number, int, Number	int is returned if both operands are int
x / y	number or int	number, int, Number	int is returned if both operands are int
x % y	number	number, int, Number
x + y	string	string or String
x + y	number or int	number, int, Number	int is returned if both operands are int
x - y	number or int	number, int, Number	int is returned if both operands are int
x << y	int	number, int, Number
x >> y	int	number, int, Number
x >>> y	int	number, int, Number
x < y	boolean	number, int, string
x <= y	boolean	number, int, string
x > y	boolean	number, int, string
x >= y	boolean	number, int, string
x in y	boolean	x: string, y: Map.<T>
x == y	boolean	boolean, number, int, string, Object
x != y	boolean	boolean, number, int, string, Object
x & y	int	number, int, Number
x ^ y	int	number, int, Number
x | y	int	number, int, Number
x && y	boolean	any
x || y	boolean	any
x ? y : z	typeof y		returned types of y and z should be equal
x ?: y	typeof x		returned types of x and y should be equal
x = y	typeof x		type of y should be convertible to type of x
x op= y	typeof x		op can be any of: * / % + - << >> >>> & ^ |
x, y	typeof y