module.exports = (x, y, callback) => {
	if(x<=0 || y<=0){
		setTimeout(() => 
			callback(new Error("Rectangle dimensions should be greater than ZERO: l = " + x + ", and b = " + y), 
				null),
			2000);
	} else{
		setTimeout(() => 
			callback(null, 
			{
				perimeter: () => (2*(x+y)),
				area: () => (x*y)
			}),
			2000);
	}
}