Haskell Language Lists Transforming with `map`
Example
Often we wish to convert, or transform the contents of a collection (a list, or something traversable). In Haskell we use map:
-- Simple add 1
map (+ 1) [1,2,3]
[2,3,4]
map odd [1,2,3]
[True,False,True]
data Gender = Male | Female deriving Show
data Person = Person String Gender Int deriving Show
-- Extract just the age from a list of people
map (\(Person n g a) -> a) [(Person "Alex" Male 31),(Person "Ellie" Female 29)]
[31,29]
