StackOverflow 文档 Haskell Language 教程 容器 - Data.Map 插入元素 插入元素 Created: November-22, 2018 插入元素很简单： > let m = Map.singleton "Alex" 31 fromList [("Alex",31)] > Map.insert "Bob" 99 m fromList [("Alex",31),("Bob",99)] 删除元素寻找值