Haskell: names of notations and operators

gistfile1.txt

Notations

.. - enumeration 

:: - It's not really a notation but still... x :: y means "the expression x has the type y" 
   - Alternatively, from Real World Haskell "The combination of :: and the type after it is called a type signature."

lines :: String -> [String] 
We can read the -> above as “to”, which loosely translates to “returns”. The signature as a whole thus reads as “lines has the type String to list-of-String”. Let's try applying the function.


Operators

operators on lists

++ - concatination - concatinate two lists
:  - cons (short for construct) - adds element to the list