Static & Private Class Fields

Which features are demonstrated in this code?

class Counter {
  #count = 0;
  static #instances = 0;
  
  constructor() {
    Counter.#instances++;
  }
  
  increment() {
    return ++this.#count;
  }
  
  static getInstanceCount() {
    return Counter.#instances;
  }
}

Private instance fields only
Static fields only
Both private instance and private static fields
This code demonstrates both private instance and static fields: 1) #count is a private instance field unique to each instance, 2) #instances is a private static field shared across all instances, 3) Private fields are denoted by the # prefix, 4) Static private fields are accessed through the class name, 5) Private fields cannot be accessed outside the class definition, 6) This combination enables both instance-level and class-level privacy.
Public fields only

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