What it is What output shows you
when you write |console.log(typeof(variable);
Undefined: "undefined"
Null: "object"
Boolean: "boolean"
Number: "number"
String: "string"
Function object: "function"
E4X XML object: "xml"
E4X XMLList object: "xml"
NodeList "Nodelist [more data]"
HTMLCollection "HTMLCollection(1) [more data]"
yes it is!Crazy JavaScript :D As promised, now let’s look as to why the type of null is an “object”. As it
then indicates that null must be an object, which is not true. In fact,
null is one of the primitive values in JavaScript.
It is actually a bug in the language and unfortunately can’t be fixed that
easily, as it will break the existing codebase.
However, there is actually one logical explanation behind why null is an object
in javascript.
In the initial version of JavaScript, values were stored in 32 bit units.
The first 3 bits represented the data type tag followed by the remaining bits
that represented the value.
For all objects it was 000 as the type tag bits. null was considered to be a
special value in JavaScript from its very first version. null was
a representation of the null pointer. However, there were no pointers in
JavaScript like C. So null simply meant nothing or void and was represented
by all 0’s. Hence all its 32 bits were 0’s. So whenever the JavaScrit
interpreter reads null, it considers the first 3 bits as type “object”.
That is why typeof null returns “object”.