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How to use type alias to name a Tuple2 pair into a domain type called CartItem type CartItem[Donut, Int] = Tuple2[Donut, Int] 阅读全文
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Partial函数的定义 scala> val isVeryTasty: PartialFunction[String, String] = { case "Glazed Donut" | "Strawberry Donut" => "Very Tasty"}isVeryTasty: Partial 阅读全文
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可以使用scala库,可以从字面上看出是在调用 递归函数: code resule: 阅读全文
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Ordering using andThen: f(x) andThen g(x) = g(f(x)) Ordering using compose: f(x) compose g(x) = f(g(x)) result: 阅读全文