Async & Await
Stop and wait until something is resolved. Async & await is just syntactic sugar on top of Promises and like promises it also provides a way to maintain asynchronous operation more synchronously. So in JavaScript asynchronous operations can be handled in various versions…
- ES5 -> Callback
- ES6 -> Promise
- ES7 -> async & await
You can use Async/Await to perform the Rest API request where you want the data to fully load before pushing it to the view. For Nodejs and browser programmers async/await is a great syntactic improvement. It helps the developer to implement functional programming in javascript and it also increases the code readability.
Example: Below is the example.
const showPosts = async () => {
const response = await fetch(*https://jsonplacenolder.typicode.com/posts');
const posts = await response.json();
console.1og(posts) ;
}
showPosts();
Output:
To notify JS that we are working with promises we need to wrap ‘await’ inside an ‘async’ function. In the above example, we (a)wait for two things: response and posts. Before we can convert the response to JSON format, we need to make sure we have the response fetched, otherwise we can end up converting a response that is not there yet, which will most likely prompt an error.
7 JavaScript Concepts That Every Web Developer Should Know
JavaScript is Everywhere. Millions of web pages are built on JavaScript and it’s not going anywhere at least for now. On one side HTML and CSS give styling to the web pages but on the other side, it’s the magic of JavaScript that makes your web page alive. Today this language is not just limited to your web browser. You can also use it for server-side applications. Isn’t it cool to use a single language for both client-side and server-side applications? A single language fulfills both of the purposes and this is the main reason TONs of job postings are there for JavaScript developers in the tech industry.
According to the Stack Overflow Developer Survey 2019, JavaScript is the #1 programming language. The language is widely used by 95% of all websites Whether it’s a small startup or a big company, most of them are working on some kind of website or an app that requires a good knowledge of this language. A lot of frameworks and libraries are there for JavaScript. These frameworks and libraries can be easily learned if your JavaScript fundamentals are clear. A lot of concepts are confusing and overwhelming for developers but a good knowledge of these concepts will help you in the long run. Frameworks and libraries come and go but the fundamentals always remain the same. It’s easy to build any kind of application and learn any framework and libraries if the fundamentals are clear. Also, it will help you in interviews as well. Let’s discuss some of the basic concepts of JavaScript which are important to learn for any JavaScript developer. Become a good front-end developer with w3wiki JavaScript Foundation – Self-Paced and learn all the aspects of web development with ease.
These are the 7 concepts:
Table of Content
- Scope
- IIFE (Immediately Invoked Function Expression)
- Hoisting
- Closures
- Callbacks
- Promises
- Async & Await
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