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5 JavaScript Fundamentals to Learn If You Want to Be a Successful Web Developer



All browsers support the open-source, most widely used client-side scripting language known as JavaScript. JavaScript is mostly used to improve user interaction with websites by adding life and interactivity. Additionally, it’s employed in the development of mobile games and applications.

Since JS is interpretive, no input is required. Separate JavaScript files are developed for large projects that incorporate a lot of interactive information. But an HTML code can also contain embedded JS. If you’re interested in JS basics and finding out how to learn JavaScript, take a look at these five fundamentals.

JavaScript benefits


JavaScript radically altered how people thought about browsers. It digitalized the entire business process and allowed the creation of complex websites.

JavaScript’s benefits include:

  • It may be used immediately in the browser and is both quick and light (client machine).

  • People have been using it for a very long time, and it still works well.

  • It’s compatible with a wide range of other programming languages and software.

  • Decreases server burden because it is client-side.

  • Creates vibrant, dynamic, and rich pages.

  • It includes a lot of free utilities to improve functionality.

  • Using Node.js, JS functionality can be extended to the backend.

What you need to know before you start

To master JavaScript, you need to understand the fundamentals of HTML and CSS, both of which are relatively simple to grasp.

This knowledge will be sufficient for most web-based tasks and a working understanding of JavaScript. For more advanced projects and abilities (like Java), it’s advised to be familiar with fundamental OOP ideas and a programming language with an OOP foundation.

To write a JS code, you can use a code editor, an IDE, or even a notepad or Textpad. In contrast to programming using editors like notepad, where you must type everything from scratch, IDEs and editors offer a natural programming experience and results that come faster.

JavaScript fundamentals to keep in mind


Let’s walk you through some JS fundamentals that you need to keep in mind before you start learning.

Functions are independent

Although functions are units of behavior, in this context it’s crucial to note their independence. In other languages like Java or C#, you need to make function declarations inside of classes.

JavaScript doesn’t operate in this way. Functions can be explained in the global scope or defined inside a module as separate, reusable units.

Objects and their nature

Indeed, objects are nothing more than a set of attributes. They are referred to as maps, hash maps, or hash tables in other languages. They’re dynamic, which means that properties can be added, changed, or removed after they’ve been formed.

Objects inherit from other objects

If you are coming from a class-based language like Java or C#, classes inheriting from other classes may be second nature to you. Again, JavaScript doesn’t support that.

In it, objects derive from predecessors known as prototypes. As was mentioned earlier, objects in this language are collections of properties. An object contains a “hidden” property that stores a reference to another object when it’s created. Prototype refers to the object being addressed.

Functions can become closures

Functions can define additional functions inside of them. Variables from the external functions may be referred to in the internal function. Additionally, when the outer function has finished running, the inner function can make references to variables from the outside function.


JavaScript treats primitives as objects in order to create the impression that this is what they are. However, primitive objects are not actually objects since they don’t consist of attribute collections.

On primitives, though, we can enforce methods. By transforming them into wrapper objects in the background, JavaScript interprets primitives as objects and enables method calls on them.

JS job prospects

In our rapidly evolving digital world, web applications represent both the present and the future. This explains why JavaScript continues to dominate.

As new websites are created every single day, each one with a plethora of interactive components, there will never be a shortage of employment for developers skilled in JavaScript.

There are numerous job vacancies for JS developers, and the annual salary for these positions is approximately $118k on average. With all this in mind, JavaScript is one of the top five programming languages.

Last but not least

Don’t forget that JS is a single-thread language. This indicates that just one statement is performed at a time. The main thread doesn’t allow for simultaneous execution of two functions.

And now you’re all set. These were the main basics you should know before you start writing JS.

You won’t make a mistake if you decide to pursue a JavaScript career since it’s clear that job prospects look more than promising.

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