Welcome!
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.
A "function" is a sequence of programming instructions that makes a calculation based on data you provide. Functions can answer questions, such as how many days have passed between two dates, or the distance between two cities.
We are currently primarily focused on functions related to Wikidata Lexemes. The Lexicographical data from Wikidata and functions to process it are essential for the goal of an Abstract Wikipedia. A tutorial on how Wikifunctions can be used with Wikidata right now is available.
Get started
Functions to try out
- is a palindrome (Z10096): test if a string is the same when read forward and backward (see Z10553 for one with Unicode grapheme support)
- has substring (Z10070): Check if a substring exists within another string. Case-sensitive. For a case-insensitivity support see: Z22812
- age (Z20756): returns the difference between two dates on the Gregorian calendar in years
- how many days between two days in the year (Z20733): number of days (non-inclusive) between two days of the year
- 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, returns 0.
- simple tense of verb (Z19514): returns simple tense of inputted verb
Learn and contribute
- Learn about Wikifunctions
- Contribute to Wikifunctions
- Get help with Wikifunctions
- Questions? Ask at the Project chat or our Telegram/IRC channel!
- Report a technical problem
- Status page lists major known issues and problems
News
- Volunteer's Corners
- The next Volunteers' Corner will be at 17:30 UTC on 2026-04-13 on Google Meet at meet.google.com/xuy-njxh-rkw.
- The most recent Volunteer's Corner is available on Commons
- Recent status updates about Wikifunctions
- 2026-03-11: A new composition language
- 2026-03-06: Citations and Copy and Paste
- 2026-02-26: Graceful overrides and fallbacks
- 2026-02-20: A sneak preview of Abstract Wikipedia
- 2026-02-13: Finishing each other sentences: Starting things; Offsite in Istanbul
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