How to Use Metaprogramming and Proxies for Object-Oriented JavaScript?

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Metaprogramming and proxies can be used to dynamically manipulate objects in JavaScript. Here are the steps to use them:

  1. Create a proxy object: The proxy object is created using the Proxy constructor, which takes two arguments – the target object to be manipulated and a handler object that defines the behavior of the proxy.
  2. Define the handler object: The handler object can contain methods that will be triggered when certain operations are performed on the target object. For example, you can use the get method to intercept property access, or the set method to intercept property assignment.
  3. Use the proxy object: Once you have created the proxy object, you can use it just like any other object in JavaScript. Any operations performed on the proxy will trigger the corresponding methods defined in the handler object.

Here is an example of how to use a proxy to log all property access on an object:

const target = {name: 'John'};
const handler = {
  get(target, prop) {
    console.log(`Accessing property ${prop}`);
    return target[prop];
const proxy = new Proxy(target, handler);
console.log(; // Accessing property name, John

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