Web Reference: foldr begins at the right-hand end of the list and combines each list entry with the accumulator value using the function you give it. The result is the final value of the accumulator after "folding" in all the list elements. Apr 15, 2018 · In fact, many functions use foldl or foldr internally—that's how they are implemented in the first place! Both foldl and foldr are so mighty, you could merely think of them as extremely powerful low-level functions used by those functions you normally use. Mar 29, 2019 · foldr is not only the right fold, it is also most commonly the right fold to use, in particular when transforming lists (or other foldables) into lists with related elements in the same order.
YouTube Excerpt: In this video we explore foldings on lists.
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