是否有“map head.group”的名称？

Question

函数map head . group :: Eq a => [a] -> [a]将相等的相邻值折叠为单个值。 与nub相反，它不会删除等值后的所有。

例如：

nub                [1,1,2,1] == [1,2]
(map head . group) [1,1,2,1] == [1,2,1]

我在标准库中找不到此功能。是否有确定的名称？

Answer 1

No, such a function is not available in the standard libraries. A quick Hoogle query reveals that the only other function in the core libraries with the type of Eq a => [a] -> [a] is nub.