Angular Interview Practice

Can fat-arrow functions be used as constructors?

1. Yes, they can be instantiated.

2. No, they do not have their own this.

3. Yes, they are just like traditional functions.

4. No, but they can return objects.

The correct answer is: No, they do not have their own this.

Fat-arrow functions, also known as arrow functions, cannot be used as constructors primarily because they do not have their own `this` context. In JavaScript, constructors are intended to create instances of objects and depend on their own `this` context to work correctly. When a function is called as a constructor using `new`, it normally sets `this` to a new object being created. However, arrow functions are lexically bound, meaning they inherit `this` from the surrounding context in which they are defined, rather than having their own. As a result, attempting to call an arrow function with `new` will throw an error because it does not have the necessary `this` binding that normal constructors require to function properly. The other options present misunderstandings about the nature of arrow functions and constructors. For instance, suggesting that arrow functions can be instantiated ignores this critical aspect of their design, while stating they behave like traditional functions overlooks their unique characteristics regarding the `this` context. Arrow functions can return objects, but this does not negate their inability to serve as constructors.