Question

for example,

$(document) // [ #document ] : document object in array
typeof $(document) // "object"
$(document).constructor // function Object() { [native code] } or function (a,b) { return some function; }

If value is array, it have to be Array constructor.

It’s not an array like object. because array like object just has array property, not like [].

How can it be?

add:
If you can, show simple example code, please.
like

a = ... 
console.log(a) // [ ... ]
console.log(a.constructor) // function Object or something

Answer 1

Take a look at the jQuery source. $(document) creates a cloned jQuery object of the document element and then makes and returns an array-like object.

the jQuery factory function $() returns a jQuery object that has many
of the properties of an array (a length, the [] array access operator,
etc.), but is not exactly the same as an array and lacks some of an
array’s built-in methods (such as .pop() and .reverse()).