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| 10.8 Write a function ''mkdir :: Path -> FTree -> FTree'' which takes a path and a filesystem and produces a new filesystem. If the path existed in the original, nothing changes. If the path didn't exist in the original, the new filesystem will contain a directory at that path. | 10.8 Write a function ''mkdir :: Path -> FTree -> FTree'' which takes a path and a filesystem and produces a new filesystem. If the path existed in the original, nothing changes. If the path didn't exist in the original, the new filesystem will contain a directory at that path. | ||
| - | 10.9 Write a function ''rm :: Path -> FTree -> FTree'' which takes a path and a filesystem and produces a new filesystem where nothing exists at that path. | + | 10.9 Write a function ''rm :: Path -> FTree -> FTree'' which takes a path and a filesystem and produces a new filesystem without the entry at that path. |
| 10.10 Write a function ''longestPath2 :: FTree -> Path'' which takes a filesystem and returns the longest path. | 10.10 Write a function ''longestPath2 :: FTree -> Path'' which takes a filesystem and returns the longest path. | ||
| - | 10.11 Write a function ''findEntry2 :: String -> FTree -> Maybe Path'' which takes the name of an entry (dir or file) and a filesystem and determines whether that entry can be found in the filesystem. If it doesn't exist, ''Nothing'' is returned, otherwise ''Just p'' where ''p'' is the complete path of that entry. | + | 10.11 Write a function ''findEntry2 :: String -> FTree -> Path'' which takes the name of an entry (dir or file) and a filesystem and determines whether that entry can be found in the filesystem. If it doesn't exist, an empty path ''[]'' is returned. |