You can use 'reduce' to build 'flatMap'. You can use 'flatMap' to build 'map' and 'filter'. What's one step back from 'reduce'?
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I'm trying to grok this and not quite succeeding. I think that stepped either too far back or a level up.
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Say you want to model (*2). Well, you could say that’s an unfold: (input -> [input, input]) composed with a fold: (+).
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