Type of returning a function defintion as object, function and undefined

Can any one tell me why console.log(typeof countup(5)); returns a object andconsole.log(typeof countdown)returns a function

the function returns an array wich is a kind of object, so typeof countup(5) reflects that
if you write countdown you are not calling the function, it is just a reference to the function, so typeof countdown is correctly saying that countdown is a function - you are not calling it as in the other case, so you are not checking the type of the returned value