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Programming-Idioms

History of Idiom 51 > diff from v34 to v35

Edit summary for version 35 by morteako:
[Haskell] fixed variable name

Version 34

2019-07-03, 16:23:22

Version 35

2019-07-04, 01:00:22

Idiom #51 Check if map contains key

Determine whether map m contains an entry for key k

Illustration

Idiom #51 Check if map contains key

Determine whether map m contains an entry for key k

Illustration
Extra Keywords
table dictionary hash
Extra Keywords
table dictionary hash
Imports
import qualified Data.Map.Strict as Map
Imports
import qualified Data.Map.Strict as Map
Code
Map.member x m
Code
Map.member k m
Comments bubble
Assumes m is an "actual" map,
m :: Map k v.
Comments bubble
Assumes m is an "actual" map,
m :: Map k v.
Doc URL
http://hackage.haskell.org/package/containers-0.6.2.1/docs/Data-Map-Strict.html
Doc URL
http://hackage.haskell.org/package/containers-0.6.2.1/docs/Data-Map-Strict.html