Practical course: JavaScript Promises and async / await

About Practical course: JavaScript Promises and async / await

Welcome to my Udemy course on Asynhcronous JavaScript!

On this very practical course we will focus on results.

How to request data from a server

How to manipulate these data

When to request data in parallel

How to request data which depends on a previous response

How to handle errors properly

Use the async/await syntax

And finally, armed with all these tools, we'll build a weather widget which fetches real data and shows the forecast for the week based on your location.

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The course is divided in five big sections:

Callback Functions - We will learn what a callback function is and when it is used. We will also explain the concept of Immediately Invoked Function Expressions.

Promises - What is a Promise, how does JavaScript wait for its response...

Error Handling - Promises can fail, and for this reason we must know how to catch possible errors and handle them properly.

Promise Object and parallel requests - We can speed up our request 40% or more by performing certain requests in parallel. We will wait until we have received both "responses" before continuing with our code.

Promise Chaining - Handle a complex chain of parallel and series requests in one single object - for better readability and code practices.

All of these major points we will learn both using the Promise syntax ( axios.get(...).then(response)...) and the async/await syntax (const response = await axios.get(...))

And finally

We will build a Weather Widget using all the knowledge from this course.