Eq a => [a] -> [(Int,a)]
我不知道Eq指的是什么,还是不知道整个定义是什么意思?
对定义中使用的<代码>a的这种限制 -> [(Int,a)]:它说,它必须界定的事例。 Eq 打字。 基本上,有<代码>Eq的类型支持平等和不平等的操作者,(=和(/=)。
详情见learnyouahaskell.com。 uce,类型与办公室的接口有些相似。
这意味着,[a]项的内容必须属于Eq类,这意味着必须证明平等。
这意味着,你的职责是把项目清单作为唯一参数。
[a] is a list of types a
并填写一份(Int, a)乳制品清单,即一张2-图形清单,其中图中的第一个项目为英特,第二个项目与该功能的列表相同。
(这里不是本地的美国籍社发言人,神学:)
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