Every Elm project needs the core libraries. They provide basic functionality including:
- The Basics — addition, subtraction, etc.
- Data Structures — lists, dictionaries, sets, etc.
- Signals — to make Elm programs reactive
In all Elm files there is a small set of default imports:
import Basics exposing (..)
import Debug
import List exposing ( List, (::) )
import Maybe exposing ( Maybe( Just, Nothing ) )
import Result exposing ( Result( Ok, Err ) )
import Signal exposing ( Signal )The intention is to include things that are both extremely useful and very
unlikely to overlap with anything that anyone will ever write in a library.
By keeping the set of default imports small, it also becomes easier to use
whatever version of map suits your fancy. Finally, it makes it easier to
figure out where the heck a function is coming from.