Factory Functions & Singleton Pattern

Which data privacy design pattern does this employee factory use?

function createEmployee(name, position) {
  const privateData = {
    salary: position === 'Manager' ? 100000 : 70000,
    performance: 'Good',
    employeeId: Math.floor(Math.random() * 10000)
  };
  
  return {
    name,
    position,
    getSalary() {
      return privateData.salary;
    },
    getPerformance() {
      return privateData.performance;
    },
    getId() {
      return privateData.employeeId;
    }
  };
}

Decorator pattern
Singleton pattern
Closure-based private state pattern
This factory implements the closure-based private state pattern: 1) It creates a private state container inaccessible from outside, 2) The returned object only exposes getter methods for accessing private data, 3) No direct modification of private properties is possible, 4) Each employee instance gets its own independent private state, 5) This achieves true encapsulation without classes or symbols, 6) This pattern is often used to create objects with controlled access to internal state.
Façade pattern

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