Javascript Proxy Objects

get

const handler = {
  get: function(obj, prop) {
    if (prop === 'id') { // Check if the id is being accessed
      throw new Error('Cannot access private properties!'); // Throw an error
    } else {
      return obj[prop]; // If it's not the id property, return it as usual
    }
  }
}

const person = {
  id: 1,
  name: 'Foo Bar'
}

const proxiedPerson = new Proxy(person, handler);

console.log(proxiedPerson.id);

set

const handler = {
  set: function(obj, prop, value) {
    if (typeof value !== 'string') {
      throw new Error('Only string values can be stored in this object!');
    } else {
      obj[prop] = value;  
    }
  }
}

const obj = {};

const proxiedObj = new Proxy(obj, handler);

console.log(proxiedObj); // This will log an empty object 
proxiedObj.name = 'Foo Bar'; // This should be allowed
console.log(proxiedObj); // This will log an object with the name property set

proxiedObj.age = 24; // This will throw an error.