フリー問題

問題文

A timer inside an object method must be able to read the object's own properties. Which statement about arrow functions is correct in this situation?

選択肢

1. An arrow function binds this to the global object of the running environment at the point of the call.
2. An arrow function receives a fresh this that points at the object which owns the method in which the arrow function was written.
3. An arrow function has no this of its own, so it keeps the this of the surrounding scope and can read the object's properties.
4. An arrow function can be given a this with call or apply, which is the usual way to fix the problem inside a timer callback.