JavaScript Promises

JavaScript Promises

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You may be wondering how to make websites perform the basic tasks efficiently. Learn about the promises of JavaScript and explore how to use them to handle asynchronous operations and make websites work well.

This super-exclusive JavaScript Promises course guides you in every possible way to provide you with a secure understanding of JavaScript promises and how they work. It will take you through the untenable inconsistency of promises, returning promises, multiple promises and promise utilities.  Armed with the proper knowledge and skills from our unique training system, you will be able to implement the promise spec, chain and combine promises and handle errors that occur inside promises.

Course design

The course is delivered through our online learning platform, accessible through any internet-connected device. There are no formal deadlines or teaching schedules, meaning you are free to study the course at your own pace.

You are taught through a combination of

Certificate of Achievement

Endorsed Certificate of Achievement from the Quality Licence Scheme

After successfully completing the course, learners will be able to order an endorsed certificate as proof of their new achievement. Endorsed certificates can be ordered and get delivered to your home by post for only £69.00. There is an additional £10 postage charge for international students.

CPD Certification from One Education

After successfully completing the assessment of this course, you will qualify for the CPD Certificate from One Education as proof of your continued expert development. Certificate is available in PDF format, at the cost of £9, or a hard copy can be sent to you via post, at the cost of £15.


This course has been endorsed by the Quality Licence Scheme for its high-quality, non-regulated provision and training programmes. This course is not regulated by Ofqual and is not an acknowledged lesson. One Education will be able to advise you on any further recognition, for example, progression routes into further and/or higher education. For further information, please visit the Learner FAQs on the Quality Licence Scheme website.

Method of Assessment

To assess your learning, you have to complete the assignment questions provided at the end of the course. You have to score at least 60% to pass the exam and to qualify for Quality Licence Scheme endorsed, and CPD acknowledged certificates. 

After submitting the assignment, our expert tutor will assess your assignment and will give you feedback on your performance.

After passing the assignment exam, you will be able to apply for a certificate.

Why Study This Course

It doesn’t matter if you are an aspiring expert or absolute beginner; this course will enhance your expertise and boost your CV with critical skills and an acknowledged certificate attesting to your knowledge.

The JavaScript Promises is fully available to anyone, and no previous lessons are needed to enrol. All One Education needs to know is that you are eager to learn and are over 16.

Course Curriculum

Section 01: JavaScript Promises
What’s the point of this course? 00:03:00
Section 02: Understanding Promises
Understanding Promises 00:03:00
Why do promises exist? 00:03:00
The Untenable Inconsistency of Promises 00:05:00
Section 03: Using Promises
Why use promises? / The Promise Specification / Standard Promise Usage 00:04:00
Demo: Standard Promise Usage 00:07:00
Returning Promises 00:05:00
Demo: Implementing the Promise Spec 00:10:00
Async/Await and Promises 00:01:00
Demo: Async/Await and Promises 00:04:00
Section 04: Multiple Promises
About Multiple Promises / Chaining Promises 00:03:00
Demo: Chaining Promises 00:04:00
Promise Utilities 00:04:00
Demo: Promise Utilities race, any and all 00:08:00
Section 05: Handling Errors with Promises
What happens when an error happens inside a promise? 00:03:00
Demo: Handling Errors with Promises 00:08:00
Course Summary 00:02:00
Assignment -JavaScript Promises 2 days, 11 hours
Order Your Certificate
Order Your Certificate QLS 00:00:00

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