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What are features , Advantages and disadvantages of Javascript?

What are features of Javascript? 

Input validation : Javascript allows you to validate user input before sending it to server for backend operations.

Control over browser : Javascript gives more control over browser due to which you can change the background colour of this page as well as the text on the browser's status bar.

Detect browser and OS : Javascript enables you to detect user’s browser and OS due to which you can perform platform dependant operations.

Handling date and time : Javascript enables you to write code based users date and time, it also enables you to capture users date and time as user and server may be in different time zone.

Generating HTML on fly : Javascript enables you to dynamically generate HTML.



 What are advantages of Javascript?

Faster speed : JavaScript is fast because it run immediately within the client-side browser. Javascript is not dependant on network unless backend data is required to be processed. Need to compile Javascript on the client–side as it is interpreted directly by web browsers.

Interoperability : Javascript can be inserted into web page regardless of extension. Within other languages such as Perl and PHP it can be used inside the script.

Rich interfaces : Javascript has vast libraries like (charts, drag and drop, sliders etc.) which enables you to provide attractive look to your website.

Reduction in server load : Since Javascript is client-side scripting language it reduces load on website servers as many operations can be performed at client-side which reduces load on server and enables it serve to more users.


What are disadvantages of Javascript?

Client-side security : JavaScript code executes in users computer hence in some cases it can be manipulated for malicious purpose.

Browser support : JavaScript is sometimes interpreted differently by different browsers.

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