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  • haskell - Sort Data. Map by value and get all biggest values - Stack . . .
    get_max_from_map m = map fst (filter is_biggest sorted) where sorted = List sortBy (\(k1, v1) (k2, v2) -> v2 `compare` v1) $ Map toList m max_v = snd $ head sorted is_biggest (key, value) = value == max_v
  • An example of using Data. Map in Haskell - Stack Overflow
    myMap = Data Map fromList [(1,"hello"), (3,"goodbye")] fromList takes a list of (key,value) tuples, and creates a map This is if you know all the key-value pairs you need at the time of construction You can use (!) or Data Map lookup to access elements
  • Maps — containers 0. 5. 10. 2 documentation - Read the Docs
    Maps (sometimes referred to as dictionaries in other languages) allow you to store associations between unique keys and values There are three implementations provided by the containers package: Data Map Strict, Data Map Lazy, and Data IntMap You almost never want the lazy version so use Data Map Strict, or if your keys are Int use Data IntMap
  • Data. Map - Haskell
    Lookup the value at a key in the map findWithDefault:: Ord k => a -> k -> Map k a -> a: O(log n) The expression (findWithDefault def k map) returns the value at key k or returns def when the key is not in the map Construction empty:: Map k a: O(1) The empty map singleton:: k -> a -> Map k a: O(1) A map with a single element Insertion





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