Make our own Types and Typeclasses

Make our own Types and Typeclasses

1. Word "data"

   • Allow us to define a new data type
     • Syntaxis
       • data "data_name" = "values" | "value2"
         • The "|" is an or
         • Both the type name and the value constructors have to be capital cased.
       • Value constructors
         • Are functions that return some data type
           • data "data_name" = "value_constructor_name" "parameter1" "parametern" | "value_constructor_name" "parameter1" "parametern"
           • We can operate over a value consctructor because is a function
             • Define the parameter of a type more generic, allow us to make the parameter of any type

2. Defining types and typeclasses in a module

   • • We define types like
       • "data_name"(..)
     • We can omit some value constructors
       • "data_name"
     • Import some specifics values constructors
       • "data_name"("value1", "valueN")

3. Record syntax

   • Allow us to define a "name" to all the values of a type

4. Type parameters

5. Deriving

   • Make our data type inherit some behaviour of some typeclass

6. Type synonym

   • GIve other name to any data type
     • type "name" = "data_type_name"

7. Recurisive data structures

   • We can define value constructors that can have the same data type that we are defining

8. Make typeclasses

   • Syntax
     • class 'Typeclass_name' 'type_value' where
       • The 'type_value' has to be a concrete type
   • Functor typeclass
     • Things that can be mapped over

Bilder und Dateien der Mindmap