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Feral is a dynamically typed, imperative, interpreted language which revolves (to most extent) around the idea of minimalism.

The primary example being that the language syntax itself does not contain anything related to imports, structure, or enums. Instead, there are libraries/functions that allow the user to import modules, and create structures as well as enums.

For feral, all imports, structures, enums, and functions are variables. This makes all of them a first class citizen. One can pass and modify all of those around in functions, etc, just like a normal variable.

Do note that Feral is not an object oriented programming language, but does support one primary construct - the dot operator.

variable.inside = 10;
let x = variable.func();

This makes the code a bit cleaner and easier to understand. See examples to understand its usage.

There is also a (WIP) book/guide for Feral available here: (source)


Hello World

let io = import('std/io');
io.println('Hello World');

Hello greeting using a function

let io = import('std/io');

let hello_fn = fn(name) {
	io.println('Hello ', name);

hello_fn('Electrux'); # prints 'Hello Electrux`

Simple factorial of 5 using a function

let io = import('std/io');

let facto = fn(num) {
	let fact = 1;
	for i in range(num, 1, -1) {
		fact *= i;
	return fact;

io.println('factorial of 5 is: ', facto(5));

Creating an empty struct

let lang = import('std/lang');
let struct_t = lang.struct(); # empty structure type (struct with no fields)

Creating a struct with fields

# fields `a` and `b` of type integers having default values `10`, and `20` respectively
let lang = import('std/lang');

let struct_t = lang.struct(a = 10, b = 20);

To create objects of this structure:

# default values for struct fields
let struct_obj1 = struct_t(); # a = 10, b = 20

# overwrite first field's value (a)
let struct_obj2 = struct_t(30); # a = 30, b = 20

# overwrite using assigned argument
let struct_obj3 = struct_t(b = 30); # a = 10, b = 30



To install Feral, the following packages are required:

  • CMake (build system - for compiling the project)
  • LibGMP (large integers)
  • LibMPFR (large floating point numbers)

Note: Feral doesn't yet support Windows.

Automated Build

You can automatically build Feral and its standard library by downloading and running It requires Git and the packages listed under Prerequisites.

# Download the script (example using wget:)
# Run it!

Manual Build

Once the prerequisites have been met, clone this repository:

git clone

Inside the repository, create a directory (say build), cd in it and run the commands for building and installing Feral:

cd Feral && mkdir build && cd build
cmake .. -DCMAKE_BUILD_TYPE=Release # optionally PREFIX_DIR=<dir> can be set before this
make -j<cpu cores on your system> install

By default, PREFIX_DIR=$HOME/.feral. Once installation is done, execute the installed feral binary ($PREFIX_DIR/bin/feral) to use the Feral language.

Post Installation

After installation is done, you'd probably also like to use the feral init command to initialize the $FERAL_HOME directory, which currently is $HOME/.feral. This directory is where external packages shall be installed.

Syntax Highlighting Extensions

As of right now, there are Feral language's syntax highlighting extensions available for Visual Studio Code and Vim editors. Installation steps can be found on their repositories.

Visual Studio Code: Feral-Lang/Feral-VSCode

Vim: Feral-Lang/Feral-Vim

For Developers

The .clang-format style file is present in the repository:


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