It is considered to be a high-level language, as it is easy to use commands that can control the behavior of HTML elements.
It can remove elements, move them around as if animated, show popups upon pressing a button or even connect to an external webpage and request data. JS allows the elements to be dynamic, rather than static, as they all were before JS.
JS is powerful enough for API (Application Programming Interface) development and manipulating the DOM (Document Object Model). For this reason, it is often considered a requirement to become a web developer.
Consider the following scenario: You would like your page to log users out when they click on a button labeled Sign out.
You may have some logic such as:
This code simply requests the address: myServerAddress/users/logout, where a backend is registering information such as the signout time and the user that signed out.
Now, we want to delete any local or session storage set by your website to completely “logout” the user. This is simple enough, as JS provides the following lines of code:
These two items that were stored in the local and session storage allow for the user to be logged in even when refreshing the browser or momentarily losing connection.
It would be a tedious task to log in every time that happened. Removing them from storage ensures that a user is not logged in automatically, thus the user would input their credentials again.
Before the invention of JS, web pages would only show static text, meaning text that doesn’t move or interact with the user. Most buttons would only redirect to other web pages. Nowadays, JS has made it possible for sites such as Google and Facebook to exist.
These are highly dynamic web pages that react to almost everything the user does. JS is executed in the background, and the code executes without the user knowing every detail of it, but for the most part, focuses on the functionality of the website.
Without JS, a website is considered to be static. Considering you can add much more for your website to function in a modern fashion, why not go for it? JS has made it easy for you to learn the way you can manipulate elements on the page, show alerts, recommend content, etc. It is an extension of the basic tools needed to create a web page.
Once you have learned the spectrum of HTML elements available, it will become easier to associate them with their specific JS functions.
CSS is used for styling elements on the page, while JS focuses on adding functionality to a web page. JS is the engine and CSS is the detail work.
They are different languages, and even though it is possible to define the styling of elements via JS, CSS is the more preferred method of styling elements and even linking them to actions such as :hover.
The time may vary depending on your frequency of study. For the most part, learning JS in a Bootcamp style, with 4 – 6 hours of daily practice, could take 1 month. But it is not enough to learn all the functions that JS has to offer.
JS is an Object Oriented programming language that requires a deeper understanding of data structures, design patterns, time complexity, etc.
to fully write efficient programs. This may take 4 – 6 months of intense practice and study, depending on your understanding of problem-solving and logical thinking, as well as mathematical applications.