[Unison](https://unisonweb.org) is a modern, statically-typed purely functional language with the ability to describe entire distributed systems using a single program. Here's an example of a distributed map-reduce implementation:
This function can be either simulated locally (possibly with faults injected for testing purposes), or run atop a distributed pool of compute. See [this article](https://www.unison-lang.org/articles/distributed-datasets/) for more in-depth coverage of how to build distributed computing libraries like this.
The build uses [Stack](http://docs.haskellstack.org/). If you don't already have it installed, [follow the install instructions](http://docs.haskellstack.org/en/stable/README.html#how-to-install) for your platform. (Hint: `brew update && brew install stack`)
If you have not set up the Haskell toolchain before and are trying to contribute to Unison on an M1 Mac, we have [some tips specifically for you](docs/m1-mac-setup-tips.markdown).
To run the Unison Local UI while building from source, you can use the `/dev-ui-install.sh` script. It will download the latest release of [unison-local-ui](https://github.com/unisonweb/unison-local-ui) and put it in the expected location for the unison executable created by `stack build`. When you start unison, you'll see a url where Unison Local UI is running.