JavaScript ES2020 - The Features You Should Know

ES2020 or ECMAScript 2020 brings exciting features to JavaScript. In this article, I want to talk about my favourite features from ES2020. That means the article does not cover all the additions. Thus, let us see my favourite new additions:

• Dynamic Import
• Nullish Coalescing Operator
• Optional Chaining Operator
• Private Class Variables
• Promise.allSettled

For more information and all the additions, have a look at the official ECMAScript Language Specification. Additionally, you can have a look at the finished proposals.

#javascript

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What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.

JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

<script type="text/javascript">
	document.write("Hello World!");
</script>

How to comment JavaScript code?

• For single line comment in JavaScript we have to use // (double slashes)
• For multiple line comments we have to use / * – – * /

<script type="text/javascript">

//single line comment

/* document.write("Hello"); */

</script>

Advantages and Disadvantages of JavaScript

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The essential JavaScript concepts that you should understand

As a JavaScript developer of any level, you need to understand its foundational concepts and some of the new ideas that help us developing code. In this article, we are going to review 16 basic concepts. So without further ado, let’s get to it.

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Favorite New Features in ES2020 - JavaScript tutorial

JavaScript’s development had been running at a slower pace ahead of the introduction of ES6 (also known as ECMAScript 2015).Now, in 2020, the latest JavaScript features have been finalized and released as ECMAScript 2020 (or ES2020). While ES2020 does not include as many features as they introduced in ES6, it has introduced a number of useful additions. In this article, I will discuss my favorite new features from ES2020.

Optional Chaining

Optional Chaining syntax allows you to access deeply nested objects without worrying about whether the property exists or not. While working with objects, you must be familiar with an error of this kind:

TypeError: Cannot read property <xyz> of undefined

The above error means that you are trying to access the property of an undefined variable. To avoid such errors, your code will look like this:

Instead of checking each node, optional chaining handles these cases with ease. Below is the same example using optional chaining:

You can also check arrays and functions using Optional Chaining. An example is given below:

---

globalThis

JavaScript is used in a variety of environments such as web browsers, Node.js, Web Workers, and so on. Each of these environments has its own object model and a different syntax to access it. ES2020brings us the **globalThis **property which always refers to the global object, no matter where you are executing your code. This property really shines when you aren’t sure what environment the code is going to run in.

The following is the example of using setTimeout function in Node.js using globalThis:

Below, the same method is used in web browser:

---

Dynamic Imports

Dynamic Imports is one of my favorite feature of ES2020. As the name implies, you can import modules dynamically. Using dynamic imports, the code is delivered via smaller bundles as required (instead of downloading a single large bundle as has been previously required).

When using dynamic imports, the import keywords can be called as a function, which returns a promise. Below is an example of how you can dynamically import a module when the user clicks on a button:

---

Promise.allSettled()

This method returns a promise that resolves after all of the given promises are either fulfilled or rejected. It is typically used where asynchronous tasks do not depend upon one another to complete successfully, as illustrated in the following example:

---

Nullish Coalescing Operator

The syntax for this operator is

let student = {}
let name = student.name ?? ‘John’

This operator will return a Right Hand Side operand when the Left Hand Side operand is either undefined or null. In the example above, the operator will set the value of name as ‘John’ as student.name is undefined.

At first glance this looks exactly the same as a logical OR operator ( || ), however, logical OR operator Right Hand Side operand when Left Hand Side Operand is false (undefined, null, “”, 0, false, NaN). Below is the comparison of both operators:

Chaining Nullish Coalescing Operator ( ?? ) with AND ( && ) or OR ( || ) operators

It’s not possible to chain AND ( && ) and OR ( || ) operators directly with ?? operator. If you need to combine them, then you must wrap && or || operator in the parenthesis

---

Conclusion

The introduction of ES2020’s new features add even more flexibility and power to the constantly evolving JavaScript. This article explored some of my favorite features but there are a number of others that I’d suggest you look into to see what might suit you best. I hope you found this article useful and that you are as excited as I am about using these features!

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JavaScript ES2020 — The Features You Should Know

ES2020 or ECMAScript 2020 brings exciting features to JavaScript. In this article, I want to talk about my favourite features from ES2020. That means the article does not cover all the additions. Thus, let us see my favourite new additions:

• Dynamic Import
• Nullish Coalescing Operator
• Optional Chaining Operator
• Private Class Variables
• Promise.allSettled

For more information and all the additions, have a look at the official ECMAScript Language Specification. Additionally, you can have a look at the finished proposals.

Dynamic Imports

One of the additions is that we can import dependencies dynamically with async/await. That means we do not have to import everything before, and we can import the dependencies only when we need them. As a result, the performance of the application improves by loading the modules at runtime.

How does it improve performance? With the conventional module system, we import the modules statically at the beginning of the program. Whether we need them now or later, we have to import them first. Also, all the code from an imported module is evaluated at the load time. Thus, it slows down the application unnecessarily. Why? Because it downloads the imported modules and evaluates the code of each module before executing your code.

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