Elm Reactor
The facts below are what the maker publishes about Elm Reactor, checked and dated. Our editors have not written about it yet.
The facts
Each one read from Elm Reactor's own pages, with the date it was checked.
What it does
- Compilation
- `elm make` compiles Elm code to HTML or JavaScript.checked 12 Oct 2026
- Compiler messages
- The guide says `elm make` produces the same messages as the online editor and `elm reactor`.checked 4 Oct 2026
- Debugging limit
- The project page says time travel is not available in `elm-reactor` at present.checked 4 Oct 2026
- Feedback
- The guide invites users to report unhelpful compiler messages through a linked GitHub page.checked 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.checked 12 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.checked 12 Oct 2026
- Learning
- The Elm guide teaches programming fundamentals and how to build interactive apps with The Elm Architecture.checked 12 Oct 2026
- License
- The repository lists a BSD-3-Clause license.checked 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.checked 12 Oct 2026
- Local server
- Running `elm reactor` at a project’s root starts a server at `http://localhost:8000`.checked 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`.checked 4 Oct 2026
- Online editor
- The Elm guide links to an online editor where users can try Elm code.checked 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.checked 12 Oct 2026
- Preview
- You can navigate to an Elm file served by the local server and see what it looks like.checked 4 Oct 2026
- Project organization
- The Elm Software Foundation describes Elm as connecting web development with academic research on functional programming languages.checked 4 Oct 2026
- Project status
- The `elm-reactor` repository was archived on August 23, 2018 and is read-only.checked 4 Oct 2026
- Purpose
- Elm is a functional language that compiles to JavaScript and is designed for websites and web apps.checked 12 Oct 2026
- Supported desktop systems
- The installation guide provides links for Mac, Linux, and Windows.checked 12 Oct 2026
The company
- Founded
- 2013checked 19 Oct 2026
Where it runs
- Installation platforms
- The Elm installation guide links to installation options for Mac, Linux, and Windows.checked 4 Oct 2026
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