How to use Data.Map ! Operator?

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  • ghc

    Mirror of the Glasgow Haskell Compiler. Please submit issues and patches to GHC's Gitlab instance (https://gitlab.haskell.org/ghc/ghc). First time contributors are encouraged to get started with the newcomers info (https://gitlab.haskell.org/ghc/ghc/wikis/contributing).

    bss@monster % ghci GHCi, version 8.8.4: https://www.haskell.org/ghc/ :? for help Loaded GHCi configuration from /home/bss/.ghc/ghci.conf GHCi> import Data.Map (0.01 secs, 0 bytes) GHCi> map = fromList [(1,1),(2,3),(5,8)] map :: (Ord k, Num k, Num a) => Map k a (0.04 secs, 24,872 bytes) GHCi> map ! 1 1 it :: Num a => a (0.01 secs, 58,424 bytes) GHCi> map ! 2 3 it :: Num a => a (0.01 secs, 58,424 bytes) GHCi> map ! 3 *** Exception: Map.!: given key is not an element in the map CallStack (from HasCallStack): error, called at libraries/containers/containers/src/Data/Map/Internal.hs:627:17 in containers-0.6.2.1:Data.Map.Internal

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