map Add in Haskell

In Haskell, a hash is known as a Map. A Map is a data structure that stores values in key-value pairs. The key is unique, and the value may be duplicated.

To add an element or pair to a Map in Haskell, you will need to use the insert function from the Data.Map module. The syntax for this function is as follows:

insert :: Ord k => k -> a -> Map k a -> Map k a

The first argument is the key, the second argument is the value to be associated with the key, and the third argument is the Map to which the pair will be added.

Here is an example of adding a key-value pair to a Map in Haskell:

import qualified Data.Map as Map
myMap :: Map.Map Char Int

myMap = Map.fromList [('a', 1), ('b', 2), ('c', 3)] -- create a Map with three key-value pairs
updatedMap = Map.insert 'd' 4 myMap -- add a new key 'd' with value 4 to the Map

In this example, we imported the Data.Map module and created a Map called myMap with three key-value pairs. We then used the insert function to add a new key-value pair to myMap and assigned the result to a new variable called updatedMap.

The updatedMap will now contain four key-value pairs: ('a', 1), ('b', 2), ('c', 3), ('d', 4).

map Add in Haskell

See this concept in other languages