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V (Wasm)

V is a statically typed, compiled programming language designed for building maintainable software.

In LiveCodes, V runs in the browser using WebAssembly: the V compiler is compiled to WebAssembly and the C it emits is compiled and linked by the same Clang toolchain the C/C++ languages use. No server is involved.

Usage​

Demo:

show code
import { createPlayground } from 'livecodes';

const options = {
  "config": {
    "activeEditor": "script",
    "script": {
      "language": "v-wasm",
      "content": "fn main() {\n\tprintln('Hello, World!')\n}"
    },
    "mode": "simple",
    "editor": "auto",
    "tools": {
      "status": "full"
    }
  }
};
createPlayground('#container', options);

Communication with JavaScript​

The program runs in the context of the result page. A few helpers are available in the browser global livecodes.v object:

  • livecodes.v.input: the standard input passed to the program.
  • livecodes.v.loaded: a promise that resolves when the compiler has downloaded and the program has run. It rejects if the environment fails to load. Other helpers should be used after it resolves.
  • livecodes.v.output: the program's standard output.
  • livecodes.v.error: the compiler diagnostics, if the code failed to compile.
  • livecodes.v.exitCode: the exit code of the program.
  • livecodes.v.run: compiles and runs the code again with new input, returning a promise that resolves with output, error and exitCode.

Example:

show code
import { createPlayground } from 'livecodes';

const options = {
  "template": "v-wasm",
  "params": {
    "activeEditor": "markup"
  }
};
createPlayground('#container', options);

fn main() {
	println('Hello, World!')
}

The program can read from the stdin pane, in the same way as the other console languages:

import os

fn main() {
	name := os.input('What is your name? ')
	println('Hello, ' + name + '!')
}

Language Info​

Name​

v-wasm

Aliases / Extensions​

v, vlang, v-wasm, wasm.v, vsh

Editor​

script

Compiler​

The V compiler compiled to WebAssembly, with its generated C compiled and linked by Clang compiled to WebAssembly.

Version​

V 0.5.2, built with Emscripten, and the @live-codes/clang-wasm toolchain.

Code Formatting​

Not currently supported.

Live Reload​

By default, new code changes are sent to the result page for re-evaluation without a full page reload, avoiding the need to reinitialize the V WebAssembly environment. This behavior can be disabled by adding the code comment // __livecodes_reload__ to the V code, which forces a full page reload.

This comment can be added in the hiddenContent property of the editor for embedded playgrounds.

Starter Template​

https://livecodes.io/?template=v-wasm

Sponsors