¿Necesita regresar después de rechazar la promesa?

Do you need to return after reject promise?

When a promise is fulfilled or rejected, it will stay in this state indefinitely (settled). So, rejecting a fulfilled promise or fulfilling a rejected promise, will have not effect. This example snippet shows that although the promise was fulfilled after being rejected, it stayed rejected.

3 Answers. There is no need to use a return statement inside a new Promise() callback. The Promise constructor is not expecting any sort of return value from the callback. So, the reason to use a return statement inside that callback is only to control the flow of execution in that function.

JavaScript Promise. reject() method returns a Promise object that is rejected with a given reason. This is also the same for promises in JavaScript. When we define a promise in JavaScript, it will be resolved when the time comes, or it will get rejected.

Promise. all is all or nothing. It resolves once all promises in the array resolve, or reject as soon as one of them rejects. In other words, it either resolves with an array of all resolved values, or rejects with a single error.

So, rejecting a fulfilled promise or fulfilling a rejected promise, will have not effect. This example snippet shows that although the promise was fulfilled after being rejected, it stayed rejected.

‘promise failed!’ Program 2: To resolve above situation we use reject () instead of throw the statements after the reject statement inside the function will get executed before the control goes to the catch block. reject ( ‘promise failed!’

A promise object has the following internal properties: pending: Initially when the executor function starts the execution. fulfilled: When the promise is resolved. rejected: When the promise is rejected.

And it helps in maintaining the promise sequence. In order to use Promise.all, create an array to keep both of promises created using the createPromise method. Use Promise.all which will return a promise which gets resolved when all promises have been resolved. Save the above changes and refresh the web page.