add js examples for oop and asynchronicity

Sascha Schulz

2023-05-09 0539670917d0aeb39caa988aa1fe05c8a0104dab

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function Rectangle(a, b) { 
    this.a = a; 
    this.b = b; 
} 
 
// jede Funktion besitzt einen Prototypen 
Rectangle.prototype.getArea = function() { 
    return this.a * this.b; 
} 
 
const r1 = new Rectangle(2, 3); 
const r2 = new Rectangle(4, 5); 
 
console.log(r1.getArea()); 
console.log(r2.getArea());