obj.sum() Returns NaN? JavaScript this & Arrow Functions Explained

Are you struggling to understand why this JavaScript code outputs NaN?
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obj.sum() Returns NaN? JavaScript this & Arrow Functions Explained
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In this video, I explain why arrow functions do not work as object methods due to lexical this binding, and how regular functions solve the problem.

You’ll learn:
✅ Difference between arrow functions and regular functions in JS
✅ How this behaves in object methods
✅ Common JavaScript interview traps
✅ React pitfalls when using arrow functions in methods

If you are preparing for JavaScript interviews, React coding interviews, or frontend challenges, this is a must-watch!

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Видео obj.sum() Returns NaN? JavaScript this & Arrow Functions Explained канала The developer school