How do you declare a JavaScript Class Method outside of the class? - Stack Overflow
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JavaScript Methods in Class Instance, Use Method Calls on JavaScript Class Instances, Codecademy JS - YouTube
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How to Add a Class to an Element Using JavaScript? - Scaler Topics
How Child Classes and Inheritance work in JavaScript | by Joseph Haefling | JavaScript in Plain English
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JavaScript Class - Find Out How Classes Works! - DataFlair
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