common lisp - How to determine the datatype of a variable -

it easy answer question (i guess), looked while not finding direct question you.

there typep determine whether given variable of specific data-type e.g. integer,hashtable etc. , there function returns data-type?

e.g.

(defvar *x* 1) *x*  (typep *x* 'integer) t  (the-type-function *x*) integer 

there typep determine whether given variable of specific data-type e.g. integer,hashtable etc. ,

not really. in common lisp variables not typed think.

(defvar *x* 1) *x*  (typep *x* 'integer) t 

above says nothing type of variable *x*. confirms object 1 of type integer.

but there function returns data-type?

not really. there function type-of, returns type of object, not of variable.

> (type-of 1) fixnum 

there no difference when value variable.

> (type-of *x*) fixnum 

but not mean variable has type.

note: common lisp has types , type declarations. looks different.