Created
August 23, 2019 13:26
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| -module joe. | |
| -export [test/0, perms/1]. | |
| test() -> | |
| [[]] = joe:perms(""), | |
| ["a"] = joe:perms("a"), | |
| ["ab", "ba"] = joe:perms("ab"), | |
| ["ba", "ab"] = joe:perms("ba"), | |
| ["123","132","213","231","312","321"] = joe:perms("123"), | |
| ok. | |
| perms([]) -> [[]]; | |
| perms(List) -> [ [H|T] || H <- List, T <- perms(List -- [H])]. |
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