StackOverflow 文件 Haskell Language 教程 容器 - Data.Map 刪除元素 刪除元素 Created: November-22, 2018 > let m = Map.fromList [("Alex", 31), ("Bob", 99)] fromList [("Alex",31),("Bob",99)] > Map.delete "Bob" m fromList [("Alex",31)] 匯入模組插入元素