Search results
Oct 7, 2024 · Implementing an alarm () API. In this example we'll implement a promise-based alarm API, called alarm(). It will take as arguments the name of the person to wake up and a delay in milliseconds to wait before waking the person up. After the delay, the function will send a "Wake up!" message, including the name of the person we need to wake up.
- Using Promises
With promises, we accomplish this by creating a promise...
- Using Promises
Implementing an alarm() API. In this example we'll implement a promise-based alarm API, called alarm(). It will take as arguments the name of the person to wake up and a delay in milliseconds to wait before waking the person up. After the delay, the function will send a "Wake up!" message, including the name of the person we need to wake up.
A promise must never be fulfilled with another promise, so it is this resolve function that we will expose, rather than the internal fulfill. We've used a couple of helper methods, so lets define those: /**. * Check if a value is a Promise and, if it is, * return the `then` method of that promise.
Apr 11, 2021 · The Promise object represents the eventual completion (or failure) of an asynchronous operation and its resulting value. It can be in one of the three states: PENDING, initial state when an ...
Feb 20, 2022 · Promise.all takes an iterable (usually, an array of promises) and returns a new promise. The new promise resolves when all listed promises are resolved, and the array of their results becomes its result. For instance, the Promise.all below settles after 3 seconds, and then its result is an array [1, 2, 3]: Please note that the order of the ...
17.7.1 Returning Promises from a callback of .then() #. Promise-flattening is mostly about making chaining more convenient: If we want to pass on a value from one .then() callback to the next one, we return it in the former. After that, .then() puts it into the Promise that it has already returned.
People also ask
Can we implement a promise API in JavaScript?
What is a promise based API?
How to implement a promise in Java?
What is a promise object in Java?
What skills do you need to implement a promise-based API in JavaScript?
How does a promise function work?
Oct 7, 2024 · With promises, we accomplish this by creating a promise chain. The API design of promises makes this great, because callbacks are attached to the returned promise object, instead of being passed into a function. Here's the magic: the then() function returns a new promise, different from the original: js.
