9 Key Skills You Need to Know in JavaScript - ByteScout
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9 Key Skills You Need to Know in JavaScript

JavaScript is one of the most important web development languages used today. It lets you add a wide range of functional features to your websites, from the most basic to the most advanced. So, whether you’re an expert developer or just a beginner starting off, there are certain key JavaScript techniques you need to know to become successful. Here are four:

Table of Contents

Asynchronous Programming:

Most developers write JavaScript code synchronously, which means that when executing a block of code, only one line of code gets executed at a time (in the order the code appears). This has a detrimental effect on the performance, as you need to wait for each operation to be completed before moving on to the next one. Asynchronous programming can help circumvent this restriction by employing techniques to manage concurrency, as it does not wait for each operation to be completed. Instead, it simply executes all operations at once. Learning how to write asynchronous JavaScript code is a key skill that any developer should master, due to the various advantages it offers, such as avoiding browser freezes and improving the speed and performance of a website or application.

Functional Programming:

Knowing how to program declaratively using pure functions is another key skill one should have, as it can completely change the way you code, for the better. With functional programming, you get to write the code purely through functions and avoid shared states, mutation of data, and side-effects. Due to the declarative nature of functional programming, the resultant code is more concise, predictable, and easier to test and alter. Also, because it is concise, the code can be executed faster, thereby improving the load times. Learning functional programming can be tough and time-consuming, but the advantages that come with it make it worth the time spent.

Writing Cross-Browser Code:

Internet users, in general, do not stick to using just one single web browser; some may prefer to use Internet Explorer, while others may be more comfortable using Google Chrome. In such a situation, you cannot afford to write code that runs on a single web browser, as that would severely limit your website audience and hinder the growth potential of your website. In order to ensure that your website is usable across popular browsers, mobile devices, and any other web browsing devices, it is essential to write JavaScript code that is compatible with multiple web browsers.

Efficient Memory Management:

The ability to write memory-efficient JavaScript code is a skill that is developed over time, but one that you should know nonetheless. Any web application or website can leak memory, making it slow down if the code is not geared towards memory-optimization. Memory leaks can sometimes even result in massive performance issues as they end up consuming a ton of valuable system resources. Even though JavaScript has its own automatic memory management system, writing and optimizing your code to better utilize memory and system resources lets you extract some extra performance from the code.

Of course, this list is not exhaustive and these are just four of many such skills that help you grow as a developer. Learning these techniques and knowing when to use them is of paramount importance. When used right, they’re sure to give the users of your website or app the best possible experience. You can also get a deeper knowledge of SQL tricks or check new things you can code with React Native.

Keep Up With The Industry

There is no doubt that the world of JavaScript keeps changing. And, keeping up to all the changes is a skill in itself. So, if you are someone who wants to excel in JavaScript, then you need to keep up with the new changes and trends. This is also true for other development professionals where you need to keep learning new things. To stay up to date with the latest information, you can subscribe to newsletters or set up alerts using emails and phone.

The key here is to be always learning and provide value to your clients by offering their solution better than their competitors.

Communication Skills

It goes with saying, communication skills are at the core of JavaScript developers. It provides you the basic foundation for the success of your project as it lets you communicate better with your clients.

This way you can better know your client’s requirements and can work better on the project. Better communication skills also help you to explain things to your client. For instance, you can help them understand the solution in a better way — which can make life easier for both you and your client. You also benefit from better collaboration with your fellow developers. Finally, you can use your communication skills to write better documentation.


As a JavaScript developer, you need to have a complete understanding of Closure. After all, it lets you play with the scope of your variables. This means that you can create functional objects that provide access to it even if you do another function call which transfers the program control to it and returns back to the original function.

JavaScript Instantiation Patterns

Another thing that you can benefit from is learning the skill to know which instantiation pattern you need to use. JavaScript is flexible when it comes to using methods. Each method type has its own benefits and usage — which makes it more important to know which one you should use and when. The instantiation patterns that you can use include functionally shared, prototypal, functional, and functional.

Time Complexity

If you want to make your applications as fast as possible, you should learn how to write algorithms with better time complexity. So, the next time you write an algorithm to solve a problem, you can measure the time complexity to improve it based on the requirements.


Check more about SQL basics and open-source SQL.


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