#### 14.2.24 null [Function] ¶

`null` object ⇒ boolean

#### Arguments and Values:: ¶

object—an object.

boolean—a boolean.

#### Description:: ¶

Returns t if object is the empty list; otherwise, returns nil.

#### Examples:: ¶

     (null '()) ⇒  T
     (null nil) ⇒  T
     (null t) ⇒  NIL
     (null 1) ⇒  NIL

#### See Also:: ¶

not [Function]

#### Notes:: ¶

null is intended to be used to test for the empty list whereas not is intended to be used to invert a boolean (or generalized boolean). Operationally, null and not compute the same result; which to use is a matter of style.

     (null object) ≡ (typep object 'null) ≡ (eq object '())