Small getter setter pattern

gettersetter.js

var obj = {
	get x() {
		return this.value || 5;
	},	

	set x(y) {
		this.value = 2 * y
	}
};

console.log( obj ); // { }
console.log( obj.x ); // 5
obj.x = 5;
console.log( obj.x ); // 10
console.log( obj ); // { value : 10 }