Assignments, i.e. Code Kata, for Coding Dojos

Question

I would like to gather a list of assignments, i.e. Code Kata, for Coding Dojos. Please provide a name and a short description of the assignment or a link.

I'll kick off things with FizzBuzz.

Update

There are some good links in the answers so far but I don't believe that mathematical and algorithmic puzzles are the best for a coding dojo. The purpose with a coding dojo is to practice programming skills together with other people and I'm sure there are problems that are better than others for this. So please share problems you've used with success in a dojo or others that might be a good fit.

Answer 1

FizzBuzz

Given the numbers 1 to 100, output "fizz" if the number is divisible by 3, "buzz" if it's divisible by 5, "fizzbuzz" if it's divisible by 3 and 5. Otherwise output the number itself.

Answer 2

To start with, there seems to be a couple of Katas posted on the Code Kata blog which was linked to in the wiki article on Code Kata.

If you have already played around with those, there are more than 250 programming/math puzzles available on Project Euler.

Answer 3

Language-specific

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Haskell:

• Haskell Quiz (Ruby Quiz answers in Haskell)
• H-99 Ninety-Nine Haskell Problems

Java

• The Bowling Game Kata
• The Prime Factors Kata

Javascript

• Javascript Katas

Lisp

• L-99 Ninety-Nine Lisp Problems

Perl

• Perl Quiz of the Week

Prolog

• P-99 Ninety-Nine Prolog problems

Python

• Python Challenge

Ruby

• Ruby Quiz

Scheme

• Scheme List Code Kata

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Not language-specific

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• Sphere Online Judge: Over 1800 problems, solvable in a lot of languages.
• Project Euler: Lots of math problems.
• Code Chef
• TDD Problems
• CodeKata
• Top Coder
• ACM Programming Challenges: Lots of problems.
• Google Code Jam
• UVa Online Judge
• Schuchert - Katas
• Kata Catalogue
• My Own Problems: Mostly Ruby