F*: A Proof-oriented Programming Language
More information on F* can be found at www.fstar-lang.org
An online book Proof-oriented Programming In F* is in the works and regular updates are posted online. The book is available as a PDF, or you can read it while trying out examples and exercises in your browser interface from this tutorial page.
The F* wiki contains additional technical documentation on F*, and is especially useful for topics that are not yet covered by the book.
Editing F* code
You can edit F* code using various text editor. Emacs has the best support currently, providing syntax highlighting, code completion and navigation, and interactive development, using fstar-mode.el. However, other editors also have limited support. More details on editor support are available on the F* wiki.
Extracting and executing F* code
By default F* only verifies the input code, it does not compile or execute it.
To execute F* code one needs to translate it for instance to OCaml or F#,
using F*'s code extraction facility---this is invoked using the
command line argument
--codegen OCaml or
More details on executing F* code via OCaml on the F* wiki.
Chatting about F* on Slack and Zulip
Users can also chat about F* or ask questions at this Zulip forum.
We also have a mailing list which we use mainly for announcements.
Please report issues using the F* issue tracker on GitHub.
Before filing please search to make sure the issue doesn't already exist.
We don't maintain old releases, so if possible please use the
online F* editor or directly the GitHub sources to check
that your problem still exists on the