Static & Private Class Fields

What pattern is demonstrated with static private members?

class Logger {
  static #logLevel = 'info';
  static {
    try {
      this.#logLevel = process.env.LOG_LEVEL || this.#logLevel;
    } catch {
      // Keep default
    }
  }
  
  static #formatMessage(level, msg) {
    return `[${level.toUpperCase()}] ${msg}`;
  }
  
  static log(msg) {
    console.log(this.#formatMessage(this.#logLevel, msg));
  }
}

Decorator pattern
Factory pattern
Utility class pattern
This demonstrates the utility class pattern with private static members: 1) All functionality is static and self-contained, 2) Private implementation details are hidden, 3) Initialization is handled in static block, 4) Configuration is protected from external modification, 5) Helper methods are private and encapsulated, 6) Common pattern for utility/helper classes.
Observer pattern

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