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fix: swap spread for slice

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shirakaba
2022-12-21 21:42:31 +09:00
parent d3d6830813
commit 959f0a2204
1 changed files with 8 additions and 2 deletions
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10
packages/core/data/dom-events/dom-event.ts
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@@ -365,8 +365,14 @@ export class DOMEvent implements Event {
// Taking multiple params instead of a single property bag saves 250
// nanoseconds per dispatchTo() call.
private handleEvent(data: EventData, isGlobal: boolean, phase: 0 | 1 | 2 | 3, removeEventListener: (eventName: string, callback?: any, thisArg?: any, capture?: boolean) => void, removeEventListenerContext: unknown) {
// Clone the array just before any mutations.
const listeners = [...this.listeners];
// Clone the array just before any mutations. I tried swapping this out
// for a copy-on-write array, but as it had to maintain its own array of
// listeners for any write actions, it actually ran significantly
// slower.
//
// There's no clear observable difference between array spread and slice
// here, but I think slice has reason to run faster.
const listeners = this.listeners.slice();
for (let i = listeners.length - 1; i >= 0; i--) {
const listener = listeners[i];