class CustomTarget { constructor() { this.listeners = {}; }
on(eventName, listener) { if (!(eventName in this.listeners)) { this.listeners[eventName] = new Set();
}
this.listeners[eventName].add(listener);
}
off(eventName, listener) { this.listeners[eventName]?.delete(listener);
}
send(eventName, ...data) { if (!this.listeners[eventName]) { return 0;
}
for (let fn of this.listeners[eventName]) { fn(...data);
}
return this.listeners[eventName].count;
}
}
const listeners = 10;
const events = 1000;
const setupCustom = () => { const target = new CustomTarget();
let total = 0;
for (let i = 0; i < listeners; i++) { target.on('foo', (inc) => { total = total + inc }); }
return () => { for (let i = 0; i < events; i++) { target.send('foo', 5); }
}
}
const setupNative = () => { const target = new EventTarget();
let total = 0;
for (let i = 0; i < listeners; i++) { target.addEventListener('foo', (e) => { total = total + e.detail }); }
return () => { for (let i = 0; i < events; i++) { const customEvent = new CustomEvent('foo', { detail: 5 }); target.dispatchEvent(customEvent);
}
}
}
const runCustomInt = setupCustom();
const runNative = setupNative();
function runCustom() { runCustomInt();
}
