Modules

Modules

1. collection of

   • types
   • related functions
   • typeclasses

2. A program in haskell is based in a collection of modules

   • use functions defined in these to perform something
     • Functions can be used several times

3. Haskell Standard library split in 4 modules

   • Data.List
     • Provides useful functions for editing lists
       • Intercalate
       • Transpose
       • Concat
       • intersperse
   • Data.Char
     • Exports functions that deal with
       • Islower
       • IsDigit
       • IsMark
       • IsNumber
   • Data.Map
     • lists that are used to store key-value pairs where ordering doesn't matter
       • FromList
       • Empty
   • Data.Set
     • They have to be called using the import command before defining the functions
       • all functions that have in a module are available when we imported them
     • Offers mathematical sets where all its elements are unique
       • FromList
       • intersection
       • difference

4. it's good practice to take functions and types that work towards a similar purpose and put them in a module

   • allow make more easily reuse those functions in other programs by just importing your module