How do you implement throttle with a trailing call?
Calculate remaining = delay - (now - last). If remaining <= 0, execute immediately. Otherwise, set a timer to execute after remaining ms. Clear the previous timer on each call. This ensures the last call executes.
Verify This Answer
Cross-check this information using these trusted sources:
More FAQs in Debounce vs Throttle: Implementation Comparison
Debounce uses setTimeout + clearTimeout (reset on each call, only last runs). Throttle uses Date.now() comparison (execute only if enough time has passed since last execution).
Debounce needs a timer variable (number from setTimeout). Throttle needs a last timestamp (number from Date.now()). Both use closures to keep the state alive across calls.
When the last call within an interval is also executed (after the interval ends). The basic throttle drops calls within the interval. The trailing version schedules the last call to run after the interval, ensuring no call is lost.
Still have questions?
Browse all our FAQs or reach out to our support team