Does the basic throttle implementation drop calls?
Yes. If a call happens within the interval (now - last < delay), it is simply ignored. No timer is set. The call is lost. Use the trailing version if you need the last call to execute.
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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.
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