typeof (Array, null) returns object and typeof(null, Array) returns function

Question

As the title says it all, typeof (Array, null) returns object and typeof(null, Array) returns function.

It returns the type of the second parameter.

Why ?

Answer 1

Because

• typeof is an operator, not a function, so typeof(expr) is typeof expr, with expr evaluated first
• a,b returns b

So

typeof (a, b) returns typeof b

and in your case

• typeof (Array, null) is typeof null which is "object"
• typeof(null, Array) is typeof Array, and Array is a function.