Power set: Difference between revisions
Content added Content deleted
(→{{header|Haskell}}: Fixed mismatch between a function name and its type signature name, added a point-free formulation) |
|||
| Line 1,438: | Line 1,438: | ||
or |
or |
||
<lang Haskell>powerSet :: [a] -> [[a]] |
<lang Haskell>powerSet :: [a] -> [[a]] |
||
powerSet = foldr (\x acc -> acc ++ map (x:) acc) [[]]</lang> |
|||
which could also be understood, in point-free terms, as: |
|||
<lang haskell>powerSet :: [a] -> [[a]] |
|||
powerSet = foldr ((mappend <*>) . fmap . (:)) (pure [])</lang> |
|||
Examples: |
Examples: |
||