# Introduction
The ```bundcore``` Rust crate is a library that implements a basic API for multi-stack virtual machine functionality and the BUND concatenative programming language. This crate does not implement any VM or parser logic, but it provides a convenient interface for feeding source code to the parser and executing it on the VM.
# Show me the code!
First, let's define a static string containing a classic HelloWorld program written in Bund language
```rust
const TEST2: &str = r#"
//
// This is BUND Hello World program
//
"Hello world!" println
"#;
```
Then, let's parse and run this code
```rust
let mut bc = Bund::new();
bc.eval(TEST2).expect("Fail to parse BUND program");
```
Both, parser and run-time error returned as one of the outcomes of this call. And output of this Bund::eval call is:
```
---- tests::test_parse_hello_world stdout ----
Hello world!
```
## What is API ?
| Bund::new() | Create and initialize interface to Bund parser and VM |
| Bund::eval() | Evaluate the code passed as string and return a reference to Bund object or Error |
| Bund::run() | Evaluate the code passed as string and return ether value stored in Workbench or if Workbench is empty, stored on top of the stack |
| Bund::init_stdlib() | Run standard library initialization routine |