JavaScript for beginners - Chapter 6 - Inline vs external JavaScript

Published: 08 September 2016
on channel: Ankpro Training
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Inline Vs External JavaScript :
JavaScript can be placed either Inline on the page or in an external .js file.
Advantages of external javascript over inline javascript :
Maintainability :
Writing javascript in external files can be referenced on multiple pages without having to duplicate the code inline on every page.

If something has to change, you have to change at one place only.

Finally external JavaScript code can be reused and maintenance will be easier.

Separation of Concerns :
Storing JavaScript in a separate external .js file strong follows Separation of concerns design principle.
It is a good practice to separate HTML, CSS and JavaScript as it makes easier working with them.
Also allows multiple developers to work simultaneously.
Performance :
An external JavaScript file can be cached by the browser .
An inline JavaScript on the page is loaded every time the page loads.





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