ES6 Classes with public and private properties

Foo.js

// private variables
let baz = 'baz';

export default class Foo {
  constructor() {
    // public
    this.bar = 'bar';
  }
  //public methods
  log() {
    console.log('bar:', this.bar, ':: baz:', baz);
  }
  
  zap() {
    baz = 'zab';
  }
  
  get baz() {
    return baz;
  }
  set baz(nv) {
    throw new Error('baz is private... you may not set it');
  }
}

main.js

import Foo from './Foo';

var foo = new Foo();

foo.log();
// -> bar: 'bar' :: baz: 'baz'

console.log(foo.bar);
// -> 'bar';

console.log(foo.baz);
// -> 'baz'

foo.bar = 'rab';
foo.zap();
foo.log();

// -> bar: 'rab' :: baz: 'zab'


foo.baz = 'zap';
// -> ERROR: baz is private.. you may not set it