Arrow functions scope

arrow_scope.js

var o = {
  traditionalFunc: function () {
    // Normal function, bound as expected
    console.log('traditionalFunc this === o?', this === o);
  },
  arrowFunc: () => {
    // Arrow function, bound to scope where it's created
    console.log('arrowFunc this === o?', this === o);
    console.log('arrowFunc this === window?', this === window);
  }
};

o.traditionalFunc();
// traditionalFunc this === o? true

o.arrowFunc();
// arrowFunc this === o? false
// arrowFunc this === window? true