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みなり 1/9/2018 7:17 AM
@omochimetaru ウオオなるほど！ｗ func getNames(cats: [Cat]) -> [Character] { return cats.flatMap { $0.name } } だと ["m", "i", "k", "e", "m", "i", "k", "e", "m", "i", "k", "e"] になりますね https://github.com/apple/swift-evolution/blob/master/proposals/0187-introduce-filtermap.md の例だと挙動が壊れないので混乱してしまいました‥ 😅 ありがとうございます！
apple/swift-evolution
swift-evolution - This maintains proposals for changes and user-visible enhancements to the Swift Programming Language.
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