haskell - 有没有办法在 GHCI 中查看模块中的函数列表？

Question

我发现在 Python 或 Common Lisp 中，您可以在运行时列出库的内容，这很方便。 Haskell 是否有同样的功能，特别是在 GHCI 提示符下？

Answer 1

GHCi 有一个 :browse 命令来列出模块的内容:

Prelude> :browse Data.List
(\\) :: (Eq a) => [a] -> [a] -> [a]
delete :: (Eq a) => a -> [a] -> [a]
deleteBy :: (a -> a -> Bool) -> a -> [a] -> [a]
deleteFirstsBy :: (a -> a -> Bool) -> [a] -> [a] -> [a]
elemIndex :: (Eq a) => a -> [a] -> Maybe Int
...
Prelude> :help                    
...
   :browse[!] [[*]<mod>]       display the names defined by module <mod>
                               (!: more details; *: all top-level names)
...