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koher 5/30/2019 7:17 AM
string1 += string2 はちゃんと string1 = string1 + string2 よりも効率的に実装されてるのか。 https://github.com/apple/swift/blob/master/stdlib/public/core/String.swift#L575-L577
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7:17 AM
他の += もかな。
7:18 AM
https://github.com/apple/swift/blob/master/stdlib/public/core/Array.swift#L1330-L1332
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