Shorthand assignment operator for inverting boolean

Question

There are shorthand operators for the basic arithmetic operators, such as:

x = x+2;
x += 2;

or

y = y*2;
y *= 2;

Answer 1

Personally I would just negate the thing the way you've done it. But if it really matters to you, and you can afford to forgo the boolean type, just use the numeric internal representation (true==1, false==0) and bitwise operators to negate it:

z = true;  // z is type boolean
z ^= 1;    // z is now false, but its type is number
           // (z == false) evaluates to true and you can still do things like if (z)...
z ^= 1;    // z is now true again