Instructions

  • 1. Your final score will reflect your grasp of the concepts—approach each question with precision.
  • 2. Thoroughly review each solution before proceeding to ensure full understanding.
  • 3. Final results will be available after submission to provide insights into areas for further improvement.
  • 4. Maintain academic integrity—plagiarism undermines learning and professional growth.
  • 5. Once submitted, responses are final, so ensure you’re confident in your answers.
  • 6. These challenges are designed to test practical knowledge; apply your skills as you would in real-world scenarios.

All Problems

Question

Action

What is the benefit of using event delegation?

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How should you avoid memory leaks with event listeners?

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When should you use stopImmediatePropagation()?

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What is the purpose of using debounce in event handling?

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What is the drawback of using inline event handlers (like onclick in HTML)?

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Which method can be used to throttle events?

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How can you prevent multiple submissions of a form?

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What is the recommended way to manage event listeners in a large application?

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Why is it important to normalize events across browsers?

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How can you ensure that an event listener is called only once?

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What is the benefit of using event delegation?

It allows for better performance by reducing the number of event listeners
It makes the code cleaner
It helps manage dynamically added elements
All of the above

How should you avoid memory leaks with event listeners?

Always remove event listeners when they are no longer needed
Use anonymous functions for event handlers
Attach event listeners to the document instead of specific elements
None of the above

When should you use stopImmediatePropagation()?

When you want to stop the event from bubbling up
When you want to prevent other listeners of the same event from being called
When you want to stop all events from being triggered
None of the above

What is the purpose of using debounce in event handling?

To ensure an event is triggered once
To limit the rate at which a function is called
To cancel an event
To speed up event handling

What is the drawback of using inline event handlers (like onclick in HTML)?

They cannot access the event object
They mix JavaScript with HTML, making it harder to maintain
They are less performant
They cannot be removed easily

Which method can be used to throttle events?

setTimeout()
setInterval()
requestAnimationFrame()
All of the above

How can you prevent multiple submissions of a form?

By disabling the submit button after the first click
By validating the form fields
By adding an event listener to the form
All of the above

What is the recommended way to manage event listeners in a large application?

Use global event listeners
Use a framework that manages event handling
Create a centralized event manager
Both b and c

Why is it important to normalize events across browsers?

To ensure all browsers have the same event model
To avoid browser-specific bugs
To ensure compatibility with older browsers
All of the above

How can you ensure that an event listener is called only once?

Use element.addEventListener('event', handler, { once: true });
Manually remove the event listener after the first call
Both a and b
Use a flag variable