boolean operation trick

Question

I've seen this before in code, but forgotten it. Basically it toggles a boolean variable. If it's true, it'll set to false and vice-versa. But unfortunately forgot the syntax.

It's basically a one liner for this:

if (myVar) {  
    myVar = false;  
} else {  
    myVar = true;  
}  

It's something like this, but don't know what it's called or the correct syntax of it:

myVar = myVar : false ? true;

Answer 1

How about

myVar = !myVar

?

Answer 2

myVar = myVar ? false : true; is using the conditional operator.

You can just do this though

myVar = !myVar;

Answer 3

Another option is XOR:

myVar ^= true;

It's notable in that only the LHS of the assignment ever changes; the right side is constant and will toggle any boolean variable. Negation's more self-documenting IMO, though.