Factory Functions & Singleton Pattern

What does this factory function demonstrate?

function createLogger(prefix) {
  return {
    log: message => console.log(`${prefix}: ${message}`),
    error: message => console.error(`${prefix} ERROR: ${message}`),
    warn: message => console.warn(`${prefix} WARN: ${message}`)
  };
}

const userLogger = createLogger('USER');
const systemLogger = createLogger('SYSTEM');

The singleton pattern
Object composition
Parameterized object creation
This factory function demonstrates parameterized object creation: 1) It creates specialized objects based on input parameters, 2) Each created object has the same methods but different behavior, 3) The input parameter is captured in a closure and influences the created object's behavior, 4) This allows for creating families of related objects with slight variations, 5) Each created logger has its own prefix that affects its output, 6) This pattern is useful for creating context-specific objects or services.
Prototype inheritance

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