Question

What happens when we do this?

function bark() {
  console.log('Woof!');
}

bark.animal = 'dog';

• A: Nothing, this is totally fine!
• B: SyntaxError. You cannot add properties to a function this way.
• C: "Woof" gets logged.
• D: ReferenceError

Answer 1

Answer: A

This is possible in JavaScript, because functions are objects! (Everything besides primitive types are objects)

A function is a special type of object. The code you write yourself isn't the actual function. The function is an object with properties. This property is invocable.