In this chapter, I give tips for getting started with the programming language ReasonML.
There are two things to install:
reason-cli: Needed to support ReasonML in editors, but also contains various tools, including the interactive ReasonML command line
rtop. The installation is described in the ReasonML docs. Editor support is provided by two parts:
The playground’s examples give you a first taste of the language.
rtop, the interactive ReasonML command line
rtop is an interactive command line for ReasonML and started via
rtop from a shell. Once it runs, interacting with it looks as follows.
Reason # 3 + 4; - : int = 7
You can already see that everything has a static type in ReasonML. Don’t forget the semicolon at the end – it triggers evaluation! You can quit
rtop via Ctrl-D or via
There are two template projects to get you started. They are created via
bsb (which is part of
bsb -init my-first-app -theme basic-reason
bsb -init my-react-app -theme react
Given that most material relevant for ReasonML uses OCaml’s syntax, it’s very useful to be able to convert from OCaml’s syntax to ReasonML’s. There are two ways of doing so:
refmt(“ReasonML format”) that is part of
reason-cli. Get documentation via