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Programming-Idioms

History of Idiom 12 > diff from v58 to v59

Edit summary for version 59 by wobray:
New Lisp implementation by user [wobray]
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Version 58

2017-10-17, 13:15:33

Version 59

2018-03-12, 12:57:21

Idiom #12 Check if list contains a value

Check if list contains a value x.
list is an iterable finite container.

Illustration

Idiom #12 Check if list contains a value

Check if list contains a value x.
list is an iterable finite container.

Illustration
Extra Keywords
array vector
Extra Keywords
array vector
Code 
(count 4 (list 2 4 6 8)) ;; Returns 1

(count 2 (list 1 3 5 6)) ;; Returns 0
Comments bubble
count returns the number of occurrences of a value in a list.