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Lisp - notevery Function
notevery function is a logical negation of every function. Where every function is checking if a predicate is t (true) for all of the elements of the sequence, notevery function checks if the given predicate is not t (true) for at least one of the elements of the sequence. We can treat notevery function as if there is any element not respecting the given criteria.
Syntax - notany function
(notevery 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 nil (false) if predicate returns t (true) for all of the elements of sequence. If predicate returns false for any of the element, notevery function stops call and returns t.
Example - Checking if every number in a list is even
Following example shows how to apply even number check on any element of the list and vectors.
main.lisp
; Check if not every number of list is even; NIL as no odd number (print(notevery #'evenp '(2 4 6 8))) (terpri) ; Check if not every number of vector is even; NIL as no odd number (print(notevery #'evenp '(2 4 6 8))) (terpri) ; Check if not every number of list is even; T as 9 is odd (print(notevery #'evenp '(2 4 6 8 9))) (terpri) ; Check if not every number of vector is even; T as 9 is odd (print(notevery #'evenp '(2 4 6 8 9)))
Output
When you execute the code, it returns the following result −
NIL NIL T T
Example - Checking if Not every 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 Not every numbers in the list is greater than 10; returns NIL as every number is > 10 (print(notevery #'(lambda (x) (> x 10)) '(11 15 14 12))) (terpri) ; Check if not every numbers in the list is greater than 10; returns t, as no number is > 10 (print(notevery #'(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 not every character in a string is alphabet; NIL as all characters are alphabet (print(notevery #'alpha-char-p "tutorialspoint")) (terpri) ; Check if not every character in a string is alphabet; T as 1 is digit (print(notevery #'alpha-char-p "tutorialspoint123"))
Output
When you execute the code, it returns the following result −
NIL T
Example - Checking Multiple lists
We can use notevery 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 T as 1 is not greater than 3, 2 is not greater than 5, 3 is not greater than 6 (print(notevery #'> '(1 2 3) '(4 5 6))) (terpri) ; Checking if none of element of first list is greater than corresponding element of second list ; return NIL as 4 is greater than 1 (print(notevery #'> '(4 5 6) '(1 2 3)))
Output
When you execute the code, it returns the following result −
T NIL
Applications
The notevery function is very useful in scenarios where no element is to satisfy a given property. Following are few of the applications of some function.
Data Validation− To check if no input is invalid.
Quality Control− To find any defective item in a batch.
Game Operations− To detect, if an enemy is within range.