An arrow function does not create its own
this, the this value of the enclosing execution context is used.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions
function Person(){
this.age = 0;
setInterval(() => {
this.age++; // |this| properly refers to the person object
}, 1000);
}
var p = new Person();
https://hacks.mozilla.org/2015/06/es6-in-depth-arrow-functions/
