Class Fields - New JavaScript Features in Node.js v12

class_fields.js

class IncreasingCounter {
  #count = 0;
  get value() {
    console.log('Getting the current value!');
    return this.#count;
  }
  increment() {
    this.#count++;
  }
}

const counter = new IncreasingCounter();
// counter.#count; // is Error
counter.increment();
console.log(counter.value); // print '1'