Wikifunctions is a Wikimedia project for everyone to collaboratively create and maintain a library of code functions to support the Wikimedia projects and beyond, in the world's natural and programming languages.

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• has substring (Z10070): Check if a substring exists within another string
• is a palindrome (Z10096): test if a string is the same when read forward and backward (see Z10553 for one with Unicode grapheme support)
• age (Z20756): Age in years
• how many days between two days in the Roman year (Z20733): dans une année romaine, détermine le nombre de jours entre deux jours définis ; l'année peut être bissextile
• is Gregorian year leap year? (Z20181): returns True if the specified year in the Gregorian calendar (the one currently used in most parts of the world) has 366 days (February 29th added), and False if the year has 365 days
• Bayes' theorem conditional probability P(A|B) (Z20000): The probability of A occurring given that B is known to have occurred. Given by Bayes' theorem: P(A|B) = P(A)*P(B|A)/P(B)
• minimum of natural number list (Z19509): Returns the smallest element from a list of natural numbers. If the list is empty, return 0.
• Simple tense of verb (Z19514): Returns simple tense of inputted verb.

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