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So, I’m back after a really long hiatus. This post is part 1 of a series about well known and perhaps not-so-well-known functional pearls. A Functional Pearl is an elegant, purely functional solution to a problem. In this post, we’ll look at the earliest known functional pearl, Christopher Strachey’s Cartesian product function. I found this pearl in a paper called “Strachey’s functional pearl, forty years on” by Mike Spivey, and this post is largely based on that paper.