add more examples / exercises for async operations

Sascha Schulz

2023-07-18 03344c7abdafe5d079d57d0df655094680d62e2b

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const p = new Promise(function(resolve, reject) { 
    reject(new Error("Fehler")); 
}); 
 
p.catch(function(e) { 
    console.log(e.message); 
});