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See chapter 1.3 of SICP. It talks about the motivation and usage of higher order abstractions in general, and also about fold specifically, which they call 'acc

• akkartik 15y ago
  Ah yes, thanks, we discussed it several times over on the arc forum (e.g. http://arclanguage.org/item?id=10791 http://arclanguage.org/item?id=10791) I was asking more about code in the wild that uses accumulate instead of the naive recursive formulation. That's typically what we mean by idiomatic. I see foldl often in haskell, but rarely in scheme. I'm not disagreeing that it's a great idea, just that this is how it 'would have been written'. Personally I find the naive recursive formulation plenty clear.