JS Built-ins
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EventTargetbeginner

EventTarget — dispatchEvent returns true

📖 Usage Example
const et = new EventTarget()
let count = 0
et.addEventListener('inc', () => count++, { once: true })
et.dispatchEvent(new Event('inc'))
et.dispatchEvent(new Event('inc'))
count  // → 1

Use { once: true } to automatically remove the listener after its first invocation.

EventTarget.dispatchEvent return value

dispatchEvent returns true unless the event is cancelable and preventDefault() was called.

Challenge: Verify that dispatchEvent returns true when a listener is registered.

💡 Hints (1)
  • • dispatchEvent returns false only when preventDefault() is called on a cancelable event