$ whois elm

Elm

first released in 2012 · by Evan Czaplicki

$ guessprog --inspect elm

year: 2012
paradigm: functional
family: ml
memory: automatic gc
binding: static
safety: strong

ELM(7)

AUTHORS: Evan Czaplicki
HISTORY: Evan Czaplicki designed Elm as his senior thesis at Harvard in 2012, aiming to make functional reactive programming practical for building web interfaces. Elm is a purely functional language that compiles to JavaScript and promises no runtime exceptions in practice, thanks to its type system and the absence of null. Its pattern for structuring apps, The Elm Architecture, inspired the Redux library for JavaScript. Elm is also famous for unusually friendly compiler error messages.
USAGE: Elm is a niche language for front-end web development, used by a small community and a handful of companies such as NoRedInk. Releases have been rare since version 0.19.1 in 2019, which has limited its growth.
SEE ALSO: Elm on Wikipedia ↗

$ cat Counter.elm

import Browser
import Html exposing (button, div, text)
import Html.Events exposing (onClick)

type Msg = Increment | Decrement

main =
    Browser.sandbox { init = 0, update = update, view = view }

update msg model =
    case msg of
        Increment -> model + 1
        Decrement -> model - 1

view model =
    div []
        [ button [ onClick Decrement ] [ text "-" ]
        , text (String.fromInt model)
        , button [ onClick Increment ] [ text "+" ]
        ]