Top 5 JavaScript Concepts You Must Know

Top 5 JavaScript Concepts You Must Know

Published at - Oct 27, 2021

There is a lot to learn in JavaScript but in this article, I’ll break it down and tell you the five most important things you need to learn in JavaScript. JavaScript is like any other language or framework and is a great way to create stunning web applications.

So, I’m going to break down the five most important things (from my perspective) that you need to know in JavaScript.

· 1. Equality · 2. Asynchronous JavaScript · 3. Error Handling · 4. ES6 SyntaxDestructuringSpread operatorTemplate literal · 5. Array Methods · Conclusion

1. Equality

This is a specifically tricky thing in JavaScript because there is a double equal and a triple equals syntax. Now with the double equals, it will compare values after it’s done some automatic convert, data conversion, or data type conversion. However, a triple equal does not do that it just does a value comparison and does not do any conversions so that can be really tricky the other.


2. Asynchronous Javascript

Asynchronous code allows the program to be executed immediately where the synchronous code will block further execution of the remaining code until it finishes the current one.


3. Error Handling

Because there’s really no structure in JavaScript, which is the bright side and the downside sometimes. Another thing is getting into surrounding code that can throw errors with a try-catch. This is really the crux of this, are you have to be able to handle those errors? because if you don’t obviously it’ll lead to problems. Especially if you’re running like a node application. One of the more recent features or versions of the node will shut down your server completely


4. ES6 Syntax

Es6 or es 2005 was a really big version of JavaScript there were lots of things that came in that new version of JavaScript. In JavaScript tutorials that you see or watch or read on a blog article and if you aren’t familiar with es6 you can kind of become lost.



Spread operator


Template literal


5. Array Methods

Es6 introduced map, filter, reduce, sum every sort those functions are incredibly useful and you’re going to see them all over the place. Some examples are there.


I have selected the “Top 5 JavaScript Concepts You Have To Know” and the list can be very long because JavaScript has many amazing features. Please feel free to provide your response and help me by suggesting some cool concepts of JavaScript, I will add them in the next article.

About author

Harendra Kanojiya

Hello, I am Harendra Kumar Kanojiya - Owner of this website and a Fullstack web developer. I have expertise in full-stack web development using Angular, PHP, Node JS, Python, Laravel, Codeigniter and, Other web technologies. I also love to write blogs on the latest web technology to keep me and others updated. Thank you for reading the articles.

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