Programming Praxis

Today’s exercise is another interview question from our unending supply of interview questions. Beware that it’s a tough one:

Write a function that takes a variable number of lists and returns the cartesian product (sometimes called the cross product) of the items in the lists. For instance, the cartesian product of the lists (1 2 3), (4) and (5 6) is the list of lists ((1 4 5) (1 4 6) (2 4 5) (2 4 6) (3 4 5) (3 4 6)). You should provide both recursive and iterative versions of your function.

Your task is to write the cartesian product function as described above. When you are finished, you are welcome to read or run a suggested solution, or to post your own solution or discuss the exercise in the comments below.

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