If the value is a thenable (i.e. Show Example. has a then method), the returned promise will "follow" that thenable, adopting its eventual state; otherwise the returned promise will be fulfilled with the value. First, we run loadScript(script), and .then we write what to do with the result. I'm an author of Fullstack React and ng-book and I've been teaching Web Development for a long time. Returns a new promise for the transformed result. Description: Resolve a Deferred object and call any doneCallbacks with the given args. When working with promises you may hear terminology ... Promise.race will reject even though promise2 supplies a valid value. Then, later when your code resolves the promise, it resolves it with a result and that result is passed to the .then() handler attached to the promise: If value is a thenable (Promise-like object, like those returned by jQuery's $.ajax), returns a trusted Promise that assimilates the state of the thenable. By converting the observab… Promise.resolve(value) Returns a new Promise object that is resolved with the given value. The then() function is called with whatever the return value is of the promise itself. Another promise method that you may see referenced is Promise.race. - fabiospampinato/promise-resolve-timeout Promise.race(iterable) takes an iterable over Promises (thenables and other values are converted to Promises via Promise.resolve()) and returns a Promise P. The first of the input Promises that is settled passes its settlement on to the output Promise.

I like to speak at conferences and eat spicy food. If the first promise resolves, Promise.race resolves with the corresponding value, if the first promise rejects, Promise.race rejects with the corresponding reason. : We must have a callback function at our disposal when calling loadScript(script, callback).In other words, we must know what to do with the result before loadScript is called. You return a promise. Promise.resolve(value) Returns a promise that is resolved with the given value. Promise.race takes a list of promises and settles as soon as the first promise in the list settles. : We can call .then on a Promise as many times as we want. - fabiospampinato/promise-resolve-timeout

The recommended method to interact via a Http service is by creating an intermediate service which has the responsibly of communicating with the API and converting the raw data into one or more domain models. For instance, in the example above, the getCurrentTime() function resolves with the currentTime() value (on successful completion) and calls the then() function on the return value (which is another promise… Transforms a promise's value by applying a function to the promise's fulfillment or rejection value. If the code returns something that is not a Promise, then JavaScript automatically wraps it into a resolved promise with that value e.g when it returns an AsyncFunction object: async function oddNumber() { return 7; } Then it’ll return a resolved Promise with the result of 7, however, we can set it to explicitly return a Promise like this:

If iterable is empty then the Promise … In this lecture we handled asynchronous code by using promises. If value is already a trusted Promise, it is returned as is.If value is not a thenable, a fulfilled Promise is returned with value as its fulfillment value. It sounds like you aren't understanding how promises are used. Create a Promise which will resolve with the provided value after a timeout. Promises Callbacks; Promises allow us to do things in the natural order. Create a Promise which will resolve with the provided value after a timeout. Normally, only the creator of a Deferred should call this method; you can prevent other code from changing the Deferred's state by returning a restricted Promise object through deferred.promise (). I technically got paid while I traveled the country as a professional comedian, but have come to terms with the fact that I am not funny.. Connect with Ari on Twitter at @auser. Create a promise that is resolved with the given value.

Promise.race by itself can't be used to reliably return the first promise that resolves. The then() function is called with whatever the return value is of the promise itself. Hi, I'm Ari. Promise.race.