complete the following program: class MyEventEmitter { /// ..... } const emitterInst = new MyEventEmitter(); emitterInst.on("message", () = console.log("message event | callback 1")); emitterInst.on("message", () = console.log("message event | callback 2")); emitterInst.on("error", () = console.log("error event | callback 1")); emitterInst.on("error", () = console.log("error event | callback 2")); emitterInst.emit("message"); emitterInst.emit("error"); /* = error event | callback 1

Question

complete the following program: class MyEventEmitter { /// ..... } const emitterInst = new MyEventEmitter(); emitterInst.on("message", () => console.log("message event | callback 1")); emitterInst.on("message", () => console.log("message event | callback 2")); emitterInst.on("error", () => console.log("error event | callback 1")); emitterInst.on("error", () => console.log("error event | callback 2")); emitterInst.emit("message"); emitterInst.emit("error"); /* => error event | callback 1

Accepted Answer

Implement a custom event emitter class in Node.js

Create a class MyEventEmitter with methods 'on' and 'emit'
Store event listeners in an object with event names as keys and arrays of callbacks as values
Implement 'on' method to add event listeners to the object
Implement 'emit' method to trigger all callbacks for a given event

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