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Understanding JavaScript Classes

As of ECMAScript 2022, JavaScript supports private fields and methods, which are not accessible outside of the class definition. This is done by prefixing the field or method name with #.

class Counter {
  #count = 0;

  increment() {
    this.#count++;
    console.log(this.#count);
  }

  getCount() {
    return this.#count;
  }
}

const counter = new Counter();
counter.increment(); // Output: 1
console.log(counter.getCount()); // Output: 1
console.log(counter.#count); // Error: Private field '#count' must be declared in an enclosing class

Sep 02, 2024
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