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fix: declare onCurrentListenersMutation on prototype

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shirakaba
2022-12-20 18:45:56 +09:00
parent d8b83e46e3
commit 96e53c6a43
1 changed files with 9 additions and 3 deletions
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12
packages/core/data/dom-events/dom-event.ts
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@@ -257,13 +257,19 @@ export class DOMEvent implements Event {
// Creating this upon class construction as an arrow function rather than as
// an inline function bound afresh on each usage saves about 210 nanoseconds
// per run of handleEvent().
private onCurrentListenersMutation = () => {
// per run of dispatchTo().
//
// Creating it on the prototype and calling with the context instead saves a
// further 125 nanoseconds per run of dispatchTo().
//
// Creating it on the prototype and binding the context instead saves a
// further 30 nanoseconds per run of dispatchTo().
private onCurrentListenersMutation() {
// Cloning the array via spread syntax is up to 180 nanoseconds
// faster per run than using Array.prototype.slice().
this.listenersLazyCopy = [...this.listenersLive];
this.listenersLive.onMutation = null;
};
}
/**
* Dispatches a synthetic event event to target and returns true if either