add a protected static method to a class in javascript

JavaScript does not natively support the concept of protected methods or properties, but you can use closures to emulate this behavior. Here's an example of how you can add a protected static method to a class in JavaScript:

index.tsx
class MyClass {
  static publicMethod() {
    // This is a public static method.
  }

  static #protectedMethod() {
    // This is a private static method.
  }

  static callProtectedMethod() {
    this.#protectedMethod();
  }
}
229 chars
14 lines

In this example, we define a class MyClass with two static methods: publicMethod, which anyone can call, and #protectedMethod, which is marked as "private" using the new # syntax from ECMAScript 2022. Then, we add a third static method, callProtectedMethod, which can be called by anyone but can also call the private #protectedMethod method.

Note that this is not true encapsulation; technically, any code can still access the #protectedMethod method by using the Reflect API or other tricks. However, it does provide a way to mark certain methods as "off-limits" to most code that uses your class, which can be useful in some cases.