Using closures to implement private variables

stay js Does not exist in the private Definition of private variables , But closures can be used to simulate

var getter, setter;
(function(){
	var privateA = 0;
	getter = function(){
		return privateA;
	};
	setter = function(newVal){
		if(typeof newVal != 'number'){
			throw new Error(" No number")
		}
		privateA = newVal;
	}
})();