Javascript private class functions

Today I learned that you can make a class function to be private by prefixing it with a #. Check this out:

class MyClass {
  myPublicFunc() {
    console.log("=> hey myPublicFunc");
    this.#myPrivateFunc();
  }

  #myPrivateFunc() {
    console.log("=> hey myPrivateFunc");
  }
}

const myClass = new MyClass();

myClass.myPublicFunc();
// => hey myPublicFunc
// => hey myPrivateFunc

myClass.#myPrivateFunc();
// Uncaught SyntaxError:
//   Private field '#myPrivateFunc' must be declared in an enclosing class

We can also use that trick to make static methods, fields or static fields as well.

Thanks Andrew Vogel for this tip 😁