A Surprising Feature of JavaScript Optional Chaining

A Surprising Feature of JavaScript Optional Chaining

In 2020 JavaScript gained a new feature – optional chaining. It solves a problem we’ve had … forever. With many workarounds and standard solutions over the years.

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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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Optional Chaining in JavaScript and How It Works

Optional Chaining is one of the newest features in JavaScript. This feature may seem insignificant. However, it can save you a lot of time, code and also a lot of headaches. In this tutorial, you will learn what this feature is about, how it works and how to use it to write better JavaScript code.

Defying the problem

Have you ever worked with objects? Then, you know how easy it is to run into following problem. Let’s say you have an object. This object has some properties and maybe also some methods. Next, let’s say that you want to work with some of these properties or methods.

Getting this done is very simple. You can access any property using either dot or square bracket notation. The same applies to methods. What happens is if you try to access some property, or method, that doesn’t exist in that object? When you try to access property that doesn’t exist you will get undefined.

// Create an object
let myObj = {
  name: 'Joe Saladino',
  email: 'joe@saladino.io'
}

// Try to access non-existing property "location"
console.log(myObj.location)
// Output:
// undefined

What if you try to access some property that is nested deeper? Imagine you have some object. This object contains some properties. The value of one of these properties is supposed to be also an object. This object should contain some additional properties. What if this nested object doesn’t exist?

What happens if you try to access some property in that non-existing nested object? You will not get undefined. What will you get instead is a TypeError. JavaScript will complain that it can’t read property of an object that is not defined.

// Create an object
let myObj = {
  name: 'Joe Saladino',
  email: 'joe@saladino.io'
}

// Try to access non-existing property "location"
console.log(myObj.location)
// Output:
// undefined

// Try to access non-existing property "city"
// in non-existing object "location"
console.log(myObj.location.city)
// Output:
// TypeError: Cannot read property 'city' of undefined

#javascript #optional chaining