add more examples / exercises for async operations

Sascha Schulz

2023-07-18 03344c7abdafe5d079d57d0df655094680d62e2b

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class Rectangle { 
    constructor(a, b) { 
        this.a = a; 
        this.b = b; 
    } 
 
    getArea() { 
        return this.a * this.b; 
    } 
} 
 
const r = new Rectangle(2, 3); 
 
console.log(r.getArea());