Key Features of V
- Simplicity: the language can be learned in less than an hour
- Fast compilation: ≈80k loc/s with a Clang backend, ≈1 million loc/s with x64 and tcc backends (Intel i5-7500, SSD, no optimization)
- Easy to develop: V compiles itself in less than a second
- Performance: as fast as C (V's main backend compiles to human readable C)
- Safety: no null, no globals, no undefined behavior, immutability by default
- C to V translation
- Hot code reloading
- Innovative memory management
- Cross-platform UI library
- Built-in graphics library
- Easy cross compilation
- Built-in ORM
- Built-in web framework
Stability guarantee and future changes
Despite being at an early development stage, the V language is relatively stable and has backwards compatibility guarantee, meaning that the code you write today is guaranteed to work a month, a year, or five years from now.
There still may be minor syntax changes before the 1.0 release, but they will be handled automatically via
vfmt, as has been done in the past.
The V core APIs (primarily the
os module) will still have minor changes until they are stabilized in 2020. Of course the APIs will grow after that, but without breaking existing code.
Unlike many other languages, V is not going to be always changing, with new features being introduced and old features modified. It is always going to be a small and simple language, very similar to the way it is right now.
Installing V from source
Linux, macOS, Windows, *BSD, Solaris, WSL, Android, Raspbian
git clone https://github.com/vlang/v cd v make
That's it! Now you have a V executable at
[path to V repo]/v.
[path to V repo] can be anywhere.
make means running
make.bat, so make sure you use
Now you can try
./v run examples/hello_world.v (
v.exe on Windows).
V is constantly being updated. To update V, simply run:
It's recommended to use Clang, GCC, or Visual Studio. If you are doing development, you most likely already have one of those installed.
Otherwise, follow these instructions:
However, if none is found when running
make on Linux or Windows, TCC is downloaded as the default C backend. It's very lightweight (several MB) so this shouldn't take too long.
NB: it is highly recommended, that you put V on your PATH. That saves you the effort to type in the full path to your v executable every time. V provides a convenience
v symlink command to do that more easily.
On Unix systems, it creates a
/usr/local/bin/v symlink to your executable. To do that, run:
sudo ./v symlink
On Windows, start a new shell with administrative privileges, for example by Windows Key, then type
cmd.exe, right click on its menu entry, and choose
Run as administrator. In the new administrative shell, cd to the path, where you have compiled v.exe, then type:
That will make V available everywhere, by adding it to your PATH. Please restart your shell/editor after that, so that it can pick the new PATH variable.
NB: there is no need to run
v symlink more than once - v will continue to be available, even after
v up, restarts and so on. You only need to run it again, if you decide to move the V repo folder somewhere else.
Expand Docker instructions
git clone https://github.com/vlang/v cd v docker build -t vlang . docker run --rm -it vlang:latest
Docker with Alpine/musl
git clone https://github.com/vlang/v cd v docker build -t vlang --file=Dockerfile.alpine . docker run --rm -it vlang:latest
Testing and running the examples
Make sure V can compile itself:
$ v V 0.2.x Use Ctrl-C or `exit` to exit >>> println('hello world') hello world >>>
cd examples v hello_world.v && ./hello_world # or simply v run hello_world.v # this builds the program and runs it right away v word_counter.v && ./word_counter cinderella.txt v run news_fetcher.v v run tetris/tetris.v
NB: In order to build Tetris or 2048 (or anything else using
gg graphics modules) on some Linux systems, you need to install
If you plan to use the http package, you also need to install OpenSSL on non-Windows systems.
macOS: brew install openssl Debian/Ubuntu: sudo apt install libssl-dev Arch/Manjaro: openssl is installed by default Fedora: sudo dnf install openssl-devel
sync module and channel implementation uses libatomic. It is most likely already installed on your system, but if not, you can install it, by doing the following:
MacOS: already installed Debian/Ubuntu: sudo apt install libatomic1 Fedora/CentOS/RH: sudo dnf install libatomic-static
Android graphical apps
vab tool, building V UI and graphical apps for Android can become as easy as:
Developing web applications
Check out the Building a simple web blog tutorial and Gitly, a light and fast alternative to GitHub/GitLab: