Is there a name for "map head. Group"?
map head . group :: Eq a => [a] -> [a] function map head . group :: Eq a => [a] -> [a] map head . group :: Eq a => [a] -> [a] collapses equal adjacent values into a single value. Unlike nub , it does not delete all of the following equal values.
For instance:
nub [1,1,2,1] == [1,2] (map head . group) [1,1,2,1] == [1,2,1] I could not find this function in the standard library. Is this name set?
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1 answer
No, such a function is not available in standard libraries. A quick Hoogle query shows that the only other function in core libraries of type Eq a => [a] -> [a] is nub .
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