Static & Private Class Fields

What advantages does this private static implementation provide?

class Validator {
  static #rules = new Map();
  
  static {
    this.#rules.set('email', /^[^@]+@[^@]+\.[^@]+$/);
    this.#rules.set('phone', /^\d{10}$/);
  }
  
  static validate(type, value) {
    const rule = this.#rules.get(type);
    return rule?.test(value) ?? false;
  }
}

Better performance
Memory savings
Encapsulated validation rules
Private static implementation provides several advantages: 1) Validation rules are protected from external modification, 2) Rules can be updated or modified only within the class, 3) Implementation details are hidden from consumers, 4) Static initialization block allows complex rules setup, 5) Central management of validation rules, 6) Prevents accidental rule corruption or override.
Simpler syntax

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