Combinations of three things

Our allCombs function is more general but it still only lets us generate combinations of two things. Now implement an allCombs3 function that generates combinations of 3 things. Don’t try to do anything fancy yet. Just use the most straightforward approach you can think of.

allCombs3 :: forall a b c d. (a -> b -> c -> d) -> Array a -> Array b -> Array c -> Array d

For convenience, MCPrelude defines a data Triple with Show instance, e.g.:

> Triple 42 "hello" 3.141
(42,"hello",3.141)

Here is example output to check your allCombs3 function.

allCombs3 Triple [1,2] [3,4] [5,6] == [(1,3,5),(1,3,6),(1,4,5),(1,4,6),(2,3,5),(2,3,6),(2,4,5),(2,4,6)]

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