- Home
- Coding Playgrounds
- Elm Reactor
On the recordRead 12 Oct 202620 facts
Elm Reactor
Elm Reactor · founded 2013
On the record
- Compilation
- `elm make` compiles Elm code to HTML or JavaScript.guide.elm-lang.org · read 12 Oct 2026
- Compiler messages
- The guide says `elm make` produces the same messages as the online editor and `elm reactor`.guide.elm-lang.org · read 4 Oct 2026
- Debugging limit
- The project page says time travel is not available in `elm-reactor` at present.github.com · read 4 Oct 2026
- Feedback
- The guide invites users to report unhelpful compiler messages through a linked GitHub page.guide.elm-lang.org · read 12 Oct 2026
- Help
- The guide says users can run `elm --help` or command-specific help, such as `elm make --help`, to see available commands and flags.guide.elm-lang.org · read 12 Oct 2026
- Installation platforms
- The Elm installation guide links to installation options for Mac, Linux, and Windows.guide.elm-lang.org · read 4 Oct 2026
- Language guarantees
- The guide lists no runtime errors in practice, friendly error messages, reliable refactoring, and automatically enforced semantic versioning for Elm packages as benefits of Elm.guide.elm-lang.org · read 12 Oct 2026
- Learning
- The Elm guide teaches programming fundamentals and how to build interactive apps with The Elm Architecture.guide.elm-lang.org · read 12 Oct 2026
- License
- The repository lists a BSD-3-Clause license.github.com · read 4 Oct 2026
- Local development
- Running `elm reactor` at a project’s root starts a server at localhost:8000 where users can view Elm files.guide.elm-lang.org · read 12 Oct 2026
- Local server
- Running `elm reactor` at a project’s root starts a server at `http://localhost:8000`.guide.elm-lang.org · read 4 Oct 2026
- More advanced projects
- The guide recommends `elm make` as the general compilation method when a project becomes too advanced for `elm reactor`.guide.elm-lang.org · read 4 Oct 2026
- Online editor
- The Elm guide links to an online editor where users can try Elm code.guide.elm-lang.org · read 12 Oct 2026
- Packages
- Elm packages are hosted at package.elm-lang.org, and `elm install` adds dependencies to a project’s `elm.json` file.guide.elm-lang.org · read 12 Oct 2026
- Preview
- You can navigate to an Elm file served by the local server and see what it looks like.guide.elm-lang.org · read 4 Oct 2026
- Project organization
- The Elm Software Foundation describes Elm as connecting web development with academic research on functional programming languages.foundation.elm-lang.org · read 4 Oct 2026
- Project status
- The `elm-reactor` repository was archived on August 23, 2018 and is read-only.github.com · read 4 Oct 2026
- Purpose
- Elm is a functional language that compiles to JavaScript and is designed for websites and web apps.guide.elm-lang.org · read 12 Oct 2026
