Private methods in ES6

privateMethods.js

//  USING SYMBOL
'use strict'


const _resetTable = Symbol('resetTable');
const _replaceTable = Symbol('replaceTable');
;

class Rejs {
  constructor() {
  }

  // public
  createTable(tableName) {
    this[_resetTable](tableName)
  }

  // private
  [_replaceTable](tableName, data) {
    // wadus wadus
  }

}


// USING WeekMaps
const _counter = new WeakMap();
const _action = new WeakMap();
class Countdown {
    constructor(counter, action) {
        _counter.set(this, counter);
        _action.set(this, action);
    }
    dec() {
        let counter = _counter.get(this);
        if (counter < 1) return;
        counter--;
        _counter.set(this, counter);
        if (counter === 0) {
            _action.get(this)();
        }
    }
}