Enforce type constraints and log access attempts

proxy.js

/* The Proxy object allows you to create a proxy for another object, 
 * enabling you to intercept and redefine fundamental operations such 
 * as property lookup, assignment, enumeration, function invocation, 
 * etc. This provides a powerful way to add custom behavior to objects.
 */
const user = {
    name: 'John',
    age: 30
};

const handler = {
    get: (target, prop) => {
        console.log(`Getting ${prop}`);
        return target[prop];
    },
    set: (target, prop, value) => {
        if (prop === 'age' && typeof value !== 'number') {
            throw new TypeError('Age must be a number');
        }
        console.log(`Setting ${prop} to ${value}`);
        target[prop] = value;
        return true;
    }
};

const proxyUser = new Proxy(user, handler);
console.log(proxyUser.name); // Getting name, John
proxyUser.age = 35; // Setting age to 35
// proxyUser.age = '35'; // Throws TypeError