Simple Person Object

person.js

const person = {
  name: "John Doe",
  age: 49
}

const handler = {
  get: function(target, props, receiver) {
    console.log(target) // eg: { name: "John Doe", age: 49 }
    console.log(props) //  eg: name
    console.log(receiver) // eg: Proxy { name: "John Doe", age: 49 }
    console.log([...arguments]) // eg: [ target, prop, receiver ]
    if (props == 'sir') return `Sir, ${target['name']}`
    return Reflect.get(...argument)
  }
}

const personProxy = new Proxy(person, handler)
console.log(personProxy.name) // John Doe
console.log(personProxy.age) // 49
console.log(personProxy.sir) // Sir, John Doe