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v

by vlang

vlang /v

Simple, fast, safe, compiled language for developing maintainable software. Compiles itself in <1s w...

17.9K Stars 1.1K Forks Last release: 17 days ago (0.1.28.1) MIT License 5.9K Commits 27 Releases

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The V Programming Language

vlang.io | Docs | Changelog | Speed | Contributing

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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: within 3% of C
  • Safety: no null, no globals, no undefined behavior, immutability by default
  • C to V translation
  • Hot code reloading
  • Cross-platform UI library
  • Built-in graphics library
  • Easy cross compilation
  • REPL
  • Built-in ORM
  • C and JavaScript backends

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.

(On Windows

make

means running

make.bat

, so make sure you use

cmd.exe

)

Now you can try

./v run examples/hello\_world.v

(

v.exe

on Windows).

V is being constantly updated. To update V, simply run:

v up

C compiler

It's recommended to use Clang or 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 would be downloaded and set as an alternative C backend. It's very lightweight (several MB) so this shouldn't take too long.

Symlinking

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 everytime. 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:

bat .\v.exe symlink

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.

Docker

Expand Docker instructions
git clone https://github.com/vlang/v
cd v
docker build -t vlang .
docker run --rm -it vlang:latest
v

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
/usr/local/v/v
### Testing and running the examples

Make sure V can compile itself:

v -o v2 cmd/v
$ v V 0.1.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

In order to build Tetris and anything else using the graphics module on non-Windows systems, you will need to install freetype libraries.

If you plan to use the http package, you also need to install OpenSSL on non-Windows systems.

macOS: brew install freetype openssl Debian/Ubuntu: sudo apt install libfreetype6-dev libssl-dev Arch/Manjaro: sudo pacman -S freetype2 Fedora: sudo dnf install freetype-devel

V UI

https://github.com/vlang/ui

Developing web applications

Check out the Building a simple web blogtutorial and Gitly, a light and fast alternative to GitHub/GitLab:

https://github.com/vlang/gitly

Troubleshooting

Please see the Troubleshooting section on our wiki page

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