Features of JavaScript – 13 Vital JavaScript Features You Must Learn!

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Do you know what JavaScript programs can do? Here is the answer, today we are going to learn about the features of JavaScript in depth. JavaScript does have some special features that make it such a popular language. Javascript is a very handy language to learn today since almost every website uses it. The coolest part of javascript is, you don’t need prior knowledge of any programming language. You just need to have some basic knowledge about JavaScript. And for that basic knowledge, you have to visit our DataFlair’s complete JavaScript tutorial series.

Features of JavaScript

Features Of JavaScript

JavaScript is divided into two main features, they are as follows –

General JavaScript Features

JavaScript language consists of several different features. Some of the general JavaScript features are as follows –

1. Validating User’s Input

JavaScript is very useful while using forms. It has the capability to validate user input for errors and also saves time. If the user leaves a required field empty or the information is incorrect, JavaScript checks for them before sending the data over to the server.

2. Simple Client-side Calculations

Since JavaScript is a client-side technology, it can perform basic calculations on the browser. The browser does not need to ask server time for every task. This is especially helpful when a user needs to perform these calculations repeatedly. In these cases, connecting to the server would take a lot more time than performing the actual calculations.

3. Greater Control

JavaScript provides greater control to the browser rather than being completely dependent on the web servers. JavaScript provides various browsers with additional functionalities that help reduce server load and network traffic.

4. Platform Independent

Since browsers interpret JavaScript, it solves the problem of compilation and compatibility. Thus it can run on Windows, Macintosh, and other Netscape-supported systems. Also, it is possible to embed them in any other script like HTML that keeps JavaScript into use.

5. Handling Dates and Time

Unlike other programming languages, JavaScript has built-in functions to determine the date and time. Thus it is very easy to code only by using methods like .getDate().

6. Generating HTML Content

JavaScript has very handy features to dynamically generate HTML content for the web. It allows us to add text, links, images, tables, etc after an event occurrence (eg – mouse click).

7. Detecting the User’s Browser and OS

JavaScript is very capable in the detection of the user’s browser and OS information. Though JavaScript runs on every platform, there may occur a situation where we need the user’s browser before processing. This can be helpful for writing code that results in different outputs in different browsers.

Do you know How to Declare and Initialize a JavaScript Variable?

Modern JavaScript Features

If we dive into some more recently added features of JavaScript that makes it unique from other programming languages. There are a lot more modern features of JavaScript invented after some general features. Some of them are as follows –

1. Let/Const

JavaScript has introduced the keywords ‘let’ and ‘const’ that are available to replace ‘var’. Unlike ‘var’, they are important due to their blocked scope i.e we can only access them in the block we defined them in. Whereas ‘var’, even if we initialize it inside a function, we can access it outside of the function.

2. Arrow Functions

These functions are very useful in simplifying the syntax and tamp down the lines of codes for the web page or web application. Since these are light-weight in syntax, they can be very easily used in anonymous functions in JavaScript.

3. Template Literal

This is a common feature in other programming languages that allows you to save variables directly into strings. This proves to be an important tool for developers as it permits them to focus more on the development of the application rather than spending the time on syntax.

4. New Array Functions

Though array functions are not necessary for any programming language, they do simplify things for the developer. This also compacts the code and makes it much easier to understand. A regular array and an associative array, JavaScript supports them both. While a regular array contains integer values for its index, indexes can be strings for an associative array.

5. Default Parameters

This JavaScript feature helps to avoid collapsing the whole code for a simple mistake. It is very useful when the developer needs to check the working of a function without any parameters.

6. Property Shorthand

Built-in methods like .get() are available for the developer’s use. These methods help avoid writing the same code every time and cut back on various lines of code. These inborn methods are really supportive of cutting back the developing time and cost.


JavaScript has become amusing as well as a really exciting space to work in recent years. JavaScript has accomplished a well-organized, sustainable code base to language that gives great productivity, readability and accessibility which is also pretty fun to work with. Here we conclude our article on features of JavaScript, the above mentioned are some features and there are a lot more, both in the language and on the way. To learn more in JavaScript you may refer our next blog on JavaScript Syntax.

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