Why You Shouldn't Use Class Selectors In JavaScript

A breakdown of why the common practice of using class selectors in JavaScript makes code impossible to refactor, and what you should do instead.

If you have been doing web development for any amount of time then you have most likely run across or written code that looks like this document.querySelector('.class'). Now there is technically nothing wrong with this code and you will see code like this more often than not, but what if I told you there was a much better way to select elements in JavaScript.

What Are Data Attribute?

That better way to select elements is by using data attributes. If you are not familiar with data attributes they are essentially custom attributes that you can add to any HTML element, and they will always start with data-. For example you could have an element like this <div data-accordion-container>...</div> which has the data-accordion-container attribute. You can also specify values for these custom data attributes like this <div data-children-count="3">...</div>. I don’t want to go too in depth into what data attributes are since that is not the focus of this article so if you want some more information you can checkout the amazing MDN docs. So now that I have explained what data attributes are, let me explain why you should be using them to select elements instead of classes.

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Private Class Fields and Methods in JavaScript Classes

JavaScript private class fields and methods are new features for JavaScript classes. In this tutorial, you will learn all you need to know about this feature. You will learn about what private methods and class fields are and how they work. You will also learn how to use them in your projects.

Introduction

When you want to add some data to JavaScript class you can do so through class properties. These properties are by default always public. This also means that they are publicly accessible and modifiable. The same also applies to class methods. They are also public by default.

This might often be okay. However, sometimes, you may want to keep some properties or methods private. You may want to make them inaccessible from the outside of the class they are defined in. This is where private methods and class fields can be handy.

Keeping it private

The idea of keeping some things private is simple and straightforward. When you want to keep something private, be it a property or method, it should be accessible only from one place. This place is the class in which you defined that property or method.

If you try to access private class field or method from elsewhere JavaScript should not allow it. This includes outside the class in which the class field or method is defined. Also any instance of that class. However, it is possible to access private class field from a method inside the same class.

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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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