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Operators
kazuho edited this page Jul 2, 2012
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The operators of JSX are mostly the same to those in JavaScript (ECMA-262 3rd edition), however some restrictions have been introduced. For example, arithmetic operators only accept numbers (or ints) as their operands.
The table below lists the operators supported by JSX.
| 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 or int | int is returned if both operands are int |
| x / y | number or int | number or int | int is returned if both operands are int |
| x % y | number | number or int | |
| x + y | string | string | |
| x + y | number or int | number or int | int is returned if both operands are int |
| x - y | number or int | number or int | int is returned if both operands are int |
| x << y | int | number or int | |
| x >> y | int | number or int | |
| x >>> y | int | number or int | |
| 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 or int | |
| x ^ y | int | number or int | |
| x | y | int | number or int | |
| 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 |