Lovely for-comprehensions: Scala's most useful syntactic tool
summary
Explains that for-comprehensions desugar to map and flatMap and filter, shows how a one-line for becomes map, nested lines become flatMap chains, and demonstrates concrete fixes like Option.toList and Future.traverse/sequence to flip List[Future] into Future[List]. Recommends avoiding pattern-matching on Option in favor of combinators, using inline vals inside comprehensions to break complex expressions, and lifting pure functions into Functor contexts so code stays concise, testable, and easier to read.
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