Implement Throttle with Cancel and Flush

Problem Statement

In React applications and complex UIs, we need the ability to cancel pending throttled operations (e.g., on component unmount) and flush pending calls immediately (e.g., before navigation). Implement a throttle with full lifecycle control.

Requirements

Implement a throttle(func, wait) function that returns a throttled function with:

• cancel() - cancels any pending trailing invocation
• flush() - immediately executes pending trailing invocation (if any)
• pending() - returns boolean indicating if a trailing call is pending
• Both leading and trailing enabled by default

Example Usage

Implementation Considerations

• flush() should be idempotent if nothing is pending
• cancel() should not affect the next leading call
• Methods should be safely callable at any time

Follow-up Questions

1. Should flush() return the result of the function call?
2. How do you handle the case where flush() is called during execution?