Afterwards, in the .then section, I call another promise for an HTTP request:
.then(result => { this.service().then(data => {}); });
Would you say that using chained promises in this manner is correct?
Afterwards, in the .then section, I call another promise for an HTTP request:
.then(result => { this.service().then(data => {}); });
Would you say that using chained promises in this manner is correct?
Close! Make sure to include the promise return in your function, such as:
.then(result => { return this.service().then(data => {}); });
or you can also use this syntax:
.then(result => this.service().then(data => {}));
If you're working with Typescript, utilizing the async/await feature can help you link promises together in a more clear and concise manner:
function fetchData(): Promise<any> { /* resolve promise */ }
function processRequest(): Promise<any> { /* resolve promise */ }
async function handlePromises() {
var result = await fetchData();
var response = await processRequest();
// ...
}
Absolutely, your two commitments are fulfilled in sequence. Just keep in mind that the second promise will only be executed if the first promise is successfully resolved.
An even more elegant solution could be:
.then(result => this.service()).then(data => {});
As discussed in this insightful response by Hrishi, when you return a "thenable" object (like a Promise) within your then() method, the original promise takes on the state of the new promise.
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