// Proxy pattern example for controlling access to a sensitive object
class SensitiveObject {
  constructor(data) {
    this.data = data
  }
  access() {
    console.log('Accessing sensitive object');
    return this.data;
  }
}

class ProxyObject {
  constructor(sensitiveObject) {
    this.sensitiveObject = sensitiveObject;
  }

  access() {
    if (this.checkAccess()) {
      return this.sensitiveObject.access();
    } else {
      console.log('Access denied');
    }
  }

  checkAccess() {
    // Perform validation or checks here
    return false; // Simulating access denial for demonstration
  }
}

// Usage
const sensitiveObject = new SensitiveObject('sensitive data');
const proxy = new ProxyObject(sensitiveObject);

proxy.access(); // Access denied