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norio_nomura 11/10/2017 1:30 AM
おお？ print(["ab", "cd"].flatMap { return $0 }) // ["a", "b", "c", "d"] print(["ab", "cd"].flatMap { $0; return $0 }) // ["ab", "cd"] https://twitter.com/gregheo/status/928787861507207168
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Greg Heo (@gregheo)
Swift observer effect at work: 😜 print(["ab", "cd"].flatMap { return $0 }) // ["a", "b", "c", "d"] print(["ab", "cd"].flatMap { $0; return $0 }) // ["ab", "cd"]
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