Add an article about cool Elm shortcuts & helpers

[n1k0]

Out of my mind right now:

(=>)

From elm-example-spa:

(=>) : a -> b -> ( a, b )
(=>) =
    (,)


{-| infixl 0 means the (=>) operator has the same precedence as (<|) and (|>),
meaning you can use it at the end of a pipeline and have the precedence work out.
-}
infixl 0 =>

So that you can write tuples like this:

    case msg of
        DismissErrors -> 
            { model | errors = [] } => Cmd.none

(?)

From take-home:

(?) : Maybe a -> a -> a
(?) mx x =
    Maybe.withDefault x mx

So you can write:

key = Dict.get myConfig.accessKey env ? ""

Let's collect other nice things here.

[vjousse]

what about the famous ! for the model/cmd combo? I was so puzzled at the beginning by this syntax…