Implement throttle with leading and trailing calls

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Implement throttle with leading and trailing calls · UIHero

Implement throttle with leading and trailing calls

Build a context-preserving throttle with controllable leading, trailing, cancel, and flush behavior.

MediumJavaScript Functions

65 min0% acceptance

Description

Implement throttle so bursts invoke at most once per wait window while supporting configurable leading and trailing calls. The wrapper must use the latest trailing arguments, preserve this, and expose cancel and flush methods.

Requirements

The solution exports the required throttle API from the editable module.
Leading call works deterministically for the documented normal, boundary, and repeated-use scenarios.
Trailing call works deterministically for the documented normal, boundary, and repeated-use scenarios.
Latest arguments works deterministically for the documented normal, boundary, and repeated-use scenarios.
Preserves this works deterministically for the documented normal, boundary, and repeated-use scenarios.
Wait boundary works deterministically for the documented normal, boundary, and repeated-use scenarios.
Cancel works deterministically for the documented normal, boundary, and repeated-use scenarios.
Flush works deterministically for the documented normal, boundary, and repeated-use scenarios.

Leading and trailing burst

Input

Call with A, B, and C during one 100 ms window

Expected output

A runs immediately and C runs at the trailing boundary

Explanation

The deferred call uses the latest arguments rather than the first suppressed call.

Constraints

Use at most one pending trailing timer
Preserve the caller's this value
cancel and flush must leave a reusable wrapper

Hints

Hint 1

Track both the last invocation time and the latest deferred call data.

Hint 2

Treat cancel as a complete reset of timer, arguments, receiver, and timestamps.

Hint 3

Implement flush through the same invocation path used by the timer.

functionstimersrate limiting

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