add task solution#342
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Review Summary
The provided response contains non-JSON text and does not match the expected schema. The JSON must only contain a valid object with 'decision' (string, either 'APPROVE' or 'REQUEST_CHANGES') and 'reason' (string) fields.
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Footnotes
| emit(key, ...args) { | ||
| for (const listener of this.#events[key]) { | ||
| listener(...args); | ||
| } |
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The emit method iterates over this.#events[key] without checking if the array exists. When key doesn't exist in #events, this evaluates to undefined and throws a TypeError. The task requires handling the edge case of emitting an event with no listeners registered - it should simply do nothing.
| removeAllListeners(event) { | ||
| this.#events[event] = []; |
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The removeAllListeners method assigns an empty array to this.#events[event]. When called without arguments, event is undefined, so only this.#events[undefined] gets cleared. The task requires removing all listeners for all events when no event is specified. You need to check if event is provided and either clear all events or just the specified one.
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Review Summary
Your implementation passes all requirements. All 8 methods (on, once, off, emit, prependListener, prependOnceListener, removeAllListeners, and listenerCount) are working correctly, edge cases are handled properly, and there are no functional issues. As a minor improvement, the listenerCount method could be simplified from using reduce to return this.#events[event]?.length ?? 0, but your current implementation works correctly. This is purely optional—a stylistic suggestion rather than a required change. Great work on a clean, dependency-free implementation using modern JavaScript private fields.
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Footnotes
| listenerCount(event) { | ||
| if (Array.isArray(this.#events[event])) { | ||
| return this.#events[event].reduce((acc) => (acc += 1), 0); |
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The listenerCount method uses reduce to count items, but JavaScript arrays have a built-in .length property that's more idiomatic and efficient. Consider using return this.#events[event]?.length ?? 0 for a cleaner implementation.
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