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Please note that the question isn’t about negating a boolean value but rather about the most elegant, efficient and nicest way of doing so.
Upon a click on a toggle button, I execute the following code to store the new state in a private bool.
_isIt = !_isIt;
It works, sure. It’s readable, sure. But so is i = i + 1, still, we always write i++. Is there a neater way to toggle a bool?
No. That’s the optimal way. Congratulations!
Even IF there would be an other way (as you commented –
_isIt!!), I believe that it would be better not to use it because you’d be raising a lot of eyebrows anyway.