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Lisp - notany Function
notany function is a logical negation of some function. Where some function is checking if a predicate is t (true) for any of the elements of the sequence, notany function checks if the given predicate is t (true) for none of the elements of the sequence. We can treat notany function as "there is no element respecting the given criteria".
Syntax - notany function
(notany predicate sequence)
Arguments
-
predicate− predicate to be applied. It returns t if check on element of sequence is true otherwise nil.
-
sequence− sequence to be searched.
Returns
This function returns t (true) if predicate returns nil, (false) for all of the elements of sequence. If predicate returns true for any of the element, notany function stops call and returns nil.
Example - Checking if sequence contains any even number
Following example shows how to apply even number check on any element of the list and vectors.
main.lisp
; Check if no number of list is even; T (print(notany #'evenp '(1 3 5 7 9))) (terpri) ; Check if no number of vector is even; T (print(notany #'evenp '(1 3 5 7 9))) (terpri) ; Check if no number of list is even; NIL as 2 is even (print(notany #'evenp '(1 2 3 5 7 9))) (terpri) ; Check if no number of vector is even; NIL as 2 is even (print(notany #'evenp '(1 2 3 5 7 9)))
Output
When you execute the code, it returns the following result −
T T NIL NIL
Example - Checking if No number is greater than 10
Following example shows how to apply a custom function check using lambda function on elements of the list.
main.lisp
; Check if No numbers in the list is greater than 10; returns NIL as 15 is > 10 (print(notany #'(lambda (x) (> x 10)) '(1 15 4 2))) (terpri) ; Check if any numbers in the list is greater than 10; returns t, as no number is > 10 (print(notany #'(lambda (x) (> x 10)) '(1 5 7 2)))
Output
When you execute the code, it returns the following result −
NIL T
Example - Checking String contains no digit
Following example shows how to apply predicate on string.
main.lisp
; Check if string contains any digit; returns T (print(notany #'digit-char-p "tutorialspoint")) (terpri) ; Check if string contains any digit; returns NIL (print(notany #'digit-char-p "tutorialspoint1323"))
Output
When you execute the code, it returns the following result −
T NIL
Example - Checking Multiple lists
We can use notany function on multiple sequences as well. The predicate must accept the same number of parameters as there are sequences as shown below:
main.lisp
; Checking if none of the elements of first list is greater than corresponding element of second list ; return NIL as 3 > 2 (print(notany #'> '(1 2 3) '(4 5 2))) (terpri) ; Checking if none of element of first list is greater than corresponding element of second list ; return T, as all elements of first list are less. (print(notany #'> '(1 2 3) '(4 5 6)))
Output
When you execute the code, it returns the following result −
NIL T
Applications
The notany function is very useful in scenarios where no element satisfies a given property. Following are few of the applications of some function.
Data Validation− To check if no value is invalid.
Security− Ensuring that no unautorized access attempt occurs.
Set Operations− To verify, if Set intersection is empty.