Ocaml interactive load file

Also pressing just TAB will insert the longest common prefix of all possibilities. UTop can do basic syntax highlighting. You can copy one from the repository, either for dark background or light background. As said earlier UTop can be run in Emacs. Instructions to set this up can be found in UTop's readme. The default toplevel can also be run this way but UTop is better in the following respects:. They are several Emacs libraries for writing shell-like modes but I wrote my own because with all of the ones I found it is possible to insert or remove characters from the prompt, which I found frustrating Even with the mode used by the Emacs Shell mode it is possible.

AFAIK at the time I wrote it the UTop mode was the only one where it was really impossible to edit the something in the frozen part of the buffer. This is a non-exhaustive list of features that have been added over time to enhance the user experience.

Some of them might be controversial, so I tried to choose what was the most requested most of the time. One of the nicest features of OCaml is that is has both a byte-code compiler ocamlc and a native-code compiler ocamlopt.

This means that you can develop programs in an interactive, bottom-up style using the REPL. Bottom-up development is a technique most-often leveraged by Lisp programmers in which you can write a single function, compile it and send it to the REPL, and then test that function interactively in the REPL.

Similar techniques should exist for other editors such as VS Code or Vim. You can even send an entire buffer to utop by pressing C-c C-b via the function utop-eval-buffer. Press RET to evaluate the code.

To solve this, create a new file in the same directory called. You just need to include a single line to load the Base library into utop :.

It is the recommended way to install the OCaml compiler and OCaml packages. Simply follow the OPAM install instructions. Other Debian packages related to OCaml are listed here. Other Ubuntu packages related to OCaml are listed here. OCaml packages are packaged according to this policy. Other Arch Linux packages related to OCaml are listed here.

We can also restrict the interface of a given submodule. It is called a module type. Let's do it in our example. The definition of the Hello module above is the equivalent of a hello. Writing all of that in one block of code is not elegant so, in general, we prefer to define the module signature separately:. You can use the ocaml toplevel to visualize the contents of an existing module, such as List :.

Let's say we feel that a function is missing from the standard List module, but we really want it as if it were part of it. In an extensions. It creates a module Extensions. List that has everything the standard List module has, plus a new optmap function. From another file, all we have to do to override the default List module is open Extensions at the beginning of the.

Contents Basic usage Interfaces and signatures Abstract types Submodules Submodule implementation Submodule interface Practical manipulation of modules Displaying the interface of a module Module inclusion. Modules Basic usage In OCaml, every piece of code is wrapped into a module. Here is the code that we have in our file amodule. Abstract types What about type definitions?