Sometimes you need more than getters and setters.
You want to **observe, validate, or modify behavior** whenever an object is used.
`Proxy` and `Reflect` make this possible in a clean, standardized way.

🔹 What Is `Proxy`?

A `Proxy` wraps an object and intercepts operations such as:

• Property access
• Assignment
• Deletion
• Function calls

```js
const proxy = new Proxy(target, handler);
The handler defines traps for these operations

🔹 Common Proxy Traps

get – Intercept Reads
const user = { name: "Vu" };
const proxy = new Proxy(user, {
 get(target, prop) {
   console.log("Reading:", prop);
   return target[prop];
 }
});

🔹Set – Intercept Writes

const proxy = new Proxy({}, {
 set(target, prop, value) {
   if (typeof value !== "string") {
     throw new TypeError("Value must be a string");
   }
   target[prop] = value;
   return true;
 }
});

🔹 Why Reflect Exists

Reflect provides methods that:
    •    Match Proxy traps
    •    Return booleans instead of throwing
    •    Are safer than direct operations

Example:
Reflect.set(target, prop, value);
Reflect.get(target, prop);

🔹 Proxy + Reflect Together (Best Practice)

const proxy = new Proxy(user, {
 get(target, prop) {
   return Reflect.get(target, prop);
 },
 set(target, prop, value) {
   return Reflect.set(target, prop, value);
 }
});

This keeps behavior predictable and consistent.

🔹 Real-World Use Cases
    •    Validation layers
    •    Access control
    •    Debug logging
    •    Reactive systems
    •    Framework internals (Vue, MobX)
 

🔹 Common Mistakes

❌ Overusing Proxy for simple tasks
❌ Forgetting to return true in set
❌ Breaking expected object behavior
 

🔹 Best Practices
    •    Use Proxy sparingly
    •    Prefer Reflect inside traps
    •    Keep traps lightweight
    •    Avoid surprising behavior

🔹 Limitations
    •    Slight performance overhead
    •    Can make debugging harder
    •    Not ideal for hot paths

🎯 Final Thought

Proxy changes how objects behave,
Reflect keeps that behavior safe and consistent.
Used wisely, they unlock powerful patterns in JavaScript.