puzzles

• Tricks of the trade: Recursion to Iteration, Part 2: Eliminating Recursion with the Time-Traveling Secret Feature Trick – May 14, 2013
• Tricks of the trade: Recursion to Iteration, Part 1: The Simple Method, secret features, and accumulators – May 11, 2013
• ClusterBy: a handy little function for the toolbox – September 1, 2007
• Solving the Google Code Jam "countPaths" problem in Perl – August 17, 2006
• Solving the Google Code Jam "countPaths" problem in Haskell – August 15, 2006
• The "perfect shuffles" puzzle (solved in Haskell) – March 23, 2006