numberp


(numberp  item)

This function verifies whether item evaluates as a number (integer or double).

Arguments

item  any value or expression to be verified

Return

T if item evaluates an integer or double number, NIL otherwise

Example

(numberp 12)  T
(numberp -2.0)  T
(numberp nil)  NIL
(numberp "abc")  NIL

Remarks



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