How to flip number and boolean values from true to false, and vice versa.

gistfile1.js

// If you want to flip a variable from true to false, you can do the following:

var x = false;
x = !!(~x+2);

// At this point, x is true.

// You can also do this with numbers.
// Let's say you want to flip 0 to 1 or 1 to 0.

var y = 1;
y = ~y+2;

// At this point, y is 0.

// As you can see, the number bitwise NOT operation is used in flipping boolean values.