A Tutorial on the Universality and Expressiveness of Fold

@article{Hutton1999ATO,
  title={A Tutorial on the Universality and Expressiveness of Fold},
  author={Graham Hutton},
  journal={J. Funct. Program.},
  year={1999},
  volume={9},
  pages={355-372}
}
In functional programming, fold is a standard operator that encapsulates a simple pattern of recursion for processing lists. This article is a tutorial on two key aspects of the fold operator for lists. First of all, we emphasize the use of the universal property of fold both as a proof principle that avoids the need for inductive proofs, and as a definition principle that guides the transformation of recursive functions into definitions using fold. Secondly, we show that even though the… CONTINUE READING
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