CODE EXAMPLE FOR JAVASCRIPT

react usestate

// Initialize useState.
const [stateVar, setStateVar] = useState();

// The useState parameters define the default value of stateVar.
useState(); // stateVar === undefined
useState(true); // stateVar === true
useState('Hamburger'); // stateVar === 'Hamburger'

// setStateVar is a function that sets the value of stateVar.
setStateVar(value);

// stateVar is equal to the value that was set in the setStateVar-function.
stateVar

/* 
Example usage - Everytime you run toggleActive, the isActive
variable will toggle between false and true.
*/
const [isActive, setIsActive] = useState(false);

function toggleActive() {
	setIsActive(!isActive);
}