Modules Chapter seven

Modules Chapter seven

1. Collection of related functions, types, and type classes

   • import <module name>
     • Data.Char
       • It exports functions that deal with characters
     • Data.Map
       • Association lists (also called dictionaries) are lists that are used to store key-value pairs where ordering doesn't matter
     • Data.Set
       • The Data.Set module offers us, well, sets. Sets are kind of like a cross between lists and maps. All the elements in a set are unique.
     • Data.List
       • The Data.List module is all about lists
         • • The function nub is imported from Data.List
             • It's equivalent to code: \xs-> length (nub xs)
     • Prelude is a module imported by default, Prelude>
     • Example of several modules implemented in GHCI session
       • • To specified the import functions there are key words that can filter the ones we need: hiding, qualified, (put the specific functions).
   • If generic can be applied in several programns

2. We say that a module exports functions. What that means is that when I import a module, I can use the functions that it exports. It can define functions that its functions call internally, but we can only see and use the ones that it exports.

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