But that LITERALLY is memorizing implementation details. Here are the rules for JS, which I happen to know, because I use it often: 1. Javascript is always pa

But that LITERALLY is memorizing implementation details. Here are the rules for JS, which I happen to know, because I use it often: 1. Javascript is always pass by value, but when a variable refers to an object (including arrays), the "value" is a reference to the object. 2. Changing the value of a variable never changes the underlying primitive or object, it just points the variable to a new primitive or object. 3. Changing a property of an object referenced by a variable does change the underlying object. Those are not trivial "just infer it" details. That's highly language specific, and absolutely unrelated to the skills the test claims to be evaluating.