Are functions objects or types in Javascript?

Question

In his Eloquent Javascript, Haverbeke claims that (page 16):

\"In a JavaScript system, most of this data is neatly separated into things called va

Answer 1

They're a type of object.

The typeof is "function":

typeof (function() {}) === "function" // true

The internal [[Class]] is [object Function]:

({}).toString.call(function() {}) === "[object Function]" // true

They're an instance of the Function constructor prototype:

(function(){}) instanceof Function // true

They're an instance of the Object constructor prototype:

(function(){}) instanceof Object // true