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The unfold method is like unfolding a protein molecule. When you stare at a data structure, it’s dense, opaque. But you supply an unfold algorithm, and what looked like a messy ball of twine unravels into a long filament made up of simple elements. When you want to iterate through something, and you want to separate the mechanism for iterating through the data from what you do with the data, :unfold should be in your tool box.