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optimize Event.fire

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This commit is contained in:
Jörg Breitbart
2026-08-20 16:32:41 +02:00
parent aca98b8a5e
commit bc62843844
1 changed files with 10 additions and 15 deletions
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src/common/Event.ts
+10 -15
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@@ -27,11 +27,13 @@ export class Emitter<T> {
} }
const entry = { fn: listener, thisArgs }; const entry = { fn: listener, thisArgs };
this._listeners = this._listeners.slice();
this._listeners.push(entry); this._listeners.push(entry);
const result = toDisposable(() => { const result = toDisposable(() => {
const idx = this._listeners.indexOf(entry); const idx = this._listeners.indexOf(entry);
if (idx !== -1) { if (idx !== -1) {
this._listeners = this._listeners.slice();
this._listeners.splice(idx, 1); this._listeners.splice(idx, 1);
} }
}); });
@@ -50,23 +52,16 @@ export class Emitter<T> {
} }
public fire(event: T): void { public fire(event: T): void {
if (this._disposed) { if (this._disposed || !this._listeners.length) {
return; return;
} }
switch (this._listeners.length) { if (this._listeners.length === 1) {
case 0: return; this._listeners[0].fn.call(this._listeners[0].thisArgs, event);
case 1: { return;
const { fn, thisArgs } = this._listeners[0]; }
fn.call(thisArgs, event); const listeners = this._listeners;
return; for (let i = 0, len = listeners.length; i < len; ++i) {
} listeners[i].fn.call(listeners[i].thisArgs, event);
default: {
// Snapshot listeners to allow modifications during iteration (2+ listeners)
const listeners = this._listeners.slice();
for (const { fn, thisArgs } of listeners) {
fn.call(thisArgs, event);
}
}
} }
} }