Resolve Promise After Given Amount of Time

Introduction

In this lab, we will learn how to create a promise that resolves to a given value after a specified amount of time using JavaScript. We will use the Promise constructor to create a new promise and the setTimeout() method to delay the resolution of the promise. This skill is essential when working with asynchronous operations in JavaScript.

Skills Graph

Creating a Promise with a Delay

To create a new promise that resolves after a specific amount of time, follow these steps:

1. Use the Promise constructor to create a new promise.
2. Inside the promise's executor function, use setTimeout() to call the promise's resolve function with the provided value after the specified delay.

Here's an example implementation of resolveAfter():

const resolveAfter = (value, delay) =>
  new Promise((resolve) => {
    setTimeout(() => resolve(value), delay);
  });

Now you can call resolveAfter() to get a promise that resolves to the provided value after the specified delay:

resolveAfter("Hello", 1000);
// Returns a promise that resolves to 'Hello' after 1s

To start practicing coding, open the Terminal or SSH and type node.

Summary

Congratulations! You have completed the Resolve Promise After Given Amount of Time lab. You can practice more labs in LabEx to improve your skills.