JavaScript Prototypes Explained | Add Property, Method | QA Thoughts
Prototypes are one of the most unique and misunderstood features in JavaScript. Unlike Java or C#, JavaScript uses "Prototype-based Inheritance." In this video, we break down exactly what that means and how you can use it to write efficient code.
We explore how to use the .prototype property to add methods to Classes and Functions dynamically, and why this technique is critical for memory management in large automation frameworks.
What you will learn:
00:00 - Introduction: Why JavaScript is unique?
00:22 - What is a Prototype? (The Blueprint concept)
01:04 - Default Prototype Inclusion
01:48 - Prototype-Based Inheritance explained
02:33 - Practical Example: The 'Person' Class
05:09 - How to add Methods dynamically using Prototype
07:19 - The Prototype Chain (How JS finds properties)
08:08 - Working with Functions vs Classes
10:13 - Why Prototypes save memory
For QA Engineers:
Understanding the Prototype chain is often asked in SDET interviews. It is also the foundation of how tools like Playwright or Cypress extend their functionality under the hood.
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