A list that is known, at compile-time, to be nonempty. This means
tail are guaranteed to succeed and you don't have to carry Maybes throughout
import List.Nonempty exposing (..) one : Nonempty Int one = fromElement 2 two : Nonempty Int two = cons 4 one toList two --> [4, 2] head two --> 4 tail two -->  toList (reverse two) --> [2, 4] toList (dropTail two) -->  member 4 two --> True foldl1 (+) two --> 6
For actual usage, I recommend
import List.Nonempty as NE exposing (Nonempty)
to just import the type.
npm install -g elm-test npm install -g elm-verify-examples elm verify-examples && elm test # From project root. Will require downloading packages on the first run.
4.0.0, for Elm 0.19, removed the following functions:
sample uses the new PRNG found in
The only breaking change from 2.x to 3.0.0 is that
andMap has arguments
reversed to allow chaining with
|> instead of backticks.
The only breaking change from 1.x to 2.0.0 is that
sample returns a generator
rather than managing seeds.