If the prototype of `Object` in JavaScript is null, why can I do Object.toString()? -

all newly created objects (with exception of objects created using object.create(null)) contain object object.prototype in prototype chain. these newly created objects can call newobject.tostring() because tostring defined on object.prototype.

however, internal prototype of object said null. if that's case, why heck can this:

object.tostring(); // prints: "function object() { [native code] }" 

perhaps i've answered own question. tostring defined on object constructor function?

why?!

> var obj = object.create(null);   undefined > obj.tostring();   typeerror: undefined not function > object.tostring();   "function object() { [native code] }" 

see, obj created null prototype, when call .tostring() on it, error happen.

but object self function, , prototype function object, has .tostring() method.