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## Hints The `Foldl` and `Foldr` methods are "fold" functions, which is a concept well-known in the functional programming world, but less so in the object-oriented one. If you'd like more background information, check out this [fold](https://en.wikipedia.org/wiki/Fold_(higher-order_function)) page.
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258 entries across 258 versions & 1 rubygems