javascript promises
var promise = new Promise(function(resolve, reject) {
// do some long running async thing…
if (/* everything turned out fine */) {
resolve("Stuff worked!");
}
else {
reject(Error("It broke"));
}
});
//usage
promise.then(
function(result) { /* handle a successful result */ },
function(error) { /* handle an error */ }
);promise javascript
/*
Promise is a constructor function, so you need to use the new keyword to
create one. It takes a function, as its argument, with two parameters -
resolve and reject. These are methods used to determine the outcome of the
promise.
The syntax looks like this:
*/
const myPromise = new Promise((resolve, reject) => {
});promises in javascript
myPromise.then(
function(value) { /* code if successful */ },
function(error) { /* code if some error */ }
);promise in js
myPromise
.then(handleResolvedA)
.then(handleResolvedB)
.then(handleResolvedC)
.catch(handleRejectedAny)
.finally(handleComplition)Copyright © 2021 Codeinu
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