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85185

Concerned Curlew answered on May 1, 2022 Popularity 1/10 Helpfulness 1/10

answer 85185

85185

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function sum (a, b) {
return Promise(function (resolve, reject) { 
 setTimeout(function () {                                       // send the response after 1 second
   if (typeof a !== "number" || typeof b !== "number") {        // testing input types
	 return reject(new TypeError("Inputs must be numbers"));
   }
   resolve(a + b);
 }, 1000);
});
}
var myPromise = sum(10, 5);
myPromsise.then(function (result) {
document.write(" 10 + 5: ", result);
return sum(null, "foo");              // Invalid data and return another promise
}).then(function () {                   // Won't be called because of the error
}).catch(function (err) {               // The catch handler is called instead, after another second
console.error(err);                   // => Please provide two numbers to sum.
});

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