5.4.1 Unary Operators

Operator	Operation	Operand type	Position	Result type
~	bitwise negation	Int	prefix	Int
!	logical negation	Bool	prefix	Bool
-	arithmetic negation	Float/Int	prefix	same as operand
++	increment	Float/Int	prefix and postfix	same as operand
--	decrement	Float/Int	prefix and postfix	same as operand

Increment and decrement

The increment and decrement operators change the given value, so they cannot be applied to a read-only value. They also produce different results based on whether they are used as a prefix operator, which evaluates to the modified value, or as a postfix operator, which evaluates to the original value:

var a = 10;
trace(a++); // 10
trace(a); // 11

a = 10;
trace(++a); // 11
trace(a); // 11

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