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Could you describe how to create an event emitter class in JavaScript, specifically focusing on the methods on, emit, and off?
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General
Focus on the publisher-subscriber pattern implementation, proper event handling, memory management considerations, and practical usage examples with the three core methods.
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Hard Difficulty
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Javascript question
JavaScript questions test your proficiency with this versatile programming language. Demonstrate your understanding of language fundamentals, asynchronous programming, frameworks, and how you build dynamic web applications.