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苹果开发中文网站Swift 5.0 值得关注的特性：增加 Result<T, E: Error> 枚举类...
source link: http://www.cocoachina.com/ios/20190422/26856.html
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在异步获取数据的场景中，常见的回调的数据结构是这样的：表示获取成功的数据，表示获取失败的 error。因为数据可能获取成功，也可能失败。因此回调中的数据和错误都是 optional 类型。
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