Reason (also known as ReasonML) acts as a bridge between two worlds: the functional, type-safe OCaml ecosystem and the more familiar JavaScript world. Created by Jordan Walke - the same person behind React - Reason provides a syntax recognizable to JavaScript developers while leveraging OCaml's powerful type system and performance under the hood.

What makes Reason compelling is its flexibility. You can write code that compiles to JavaScript for the web or to native code for performance-sensitive applications. Additionally, ReasonReact lets you build user interfaces with React components while benefiting from static type checking.

If you are a JavaScript developer wanting to explore functional programming without leaving your comfort zone, or an OCaml enthusiast aiming for the web, Reason may be the tool you are looking for.