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          <h2 class="site-title">The Rune Programming Language</h2>

          
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    <p>Welcome to the Rune Programming Language.</p>
<p>Rune is a dynamic programming language that is easily embeddable and has support for an exciting set of language features.</p>
<h4 id="asynchronous-first">Asynchronous first</h4>
<p>Rune prioritized excellent support for <code>async</code> with support for async functions,
<a href="https://rune-rs.github.io/book/async.html#async-closures">closures</a>, <a href="https://rune-rs.github.io/book/async.html#async-blocks">blocks</a>, and <a href="https://rune-rs.github.io/book/streams.html">generators</a>. And native support for <a href="https://rune-rs.github.io/book/async.html#select-blocks"><code>select</code></a>, a
popular control flow mechanism for asynchronous code.</p>
<div class="rune big"
    rune-update-url="false"
    rune-run-on-change="false""
    rune-run-button="false""
    rune-options="""
    rune-instructions="""
    rune-config="""
    >
    <div class="rune-editor">use std::future;

struct Timeout;

const SITE = &quot;https:&#x2F;&#x2F;httpstat.us&quot;;

async fn request(timeout) {
    let request = http::get(`${SITE}&#x2F;200?sleep=${timeout}`);
    let timeout = time::sleep(time::Duration::from_secs(1));

    let result = select {
        res = request =&gt; res,
        _ = timeout =&gt; Err(Timeout),
    }?;

    let text = result.text().await?;
    Ok(text)
}

pub async fn main() {
    let result = future::join((request(0), request(1500))).await;
    dbg(result);
}</div>
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    <div class="rune-footnote">Asynchronous programming using select</div>
</div>
<h4 id="const-evaluation"><code>const</code> evaluation</h4>
<p>Rune has support for constant evaluation using the <code>const</code> keyword. Which
can perform complex work at compile time.</p>
<div class="rune big"
    rune-update-url="false"
    rune-run-on-change="true""
    rune-run-button="false""
    rune-options="""
    rune-instructions="""
    rune-config="""
    >
    <div class="rune-editor">const BASE = 10;
const LIMIT = 0b1 &lt;&lt; 10;

const VALUE = {
    let timeout = BASE;

    while timeout &lt; LIMIT {
        timeout = timeout * 2;
    }

    `https:&#x2F;&#x2F;httpstat.us&#x2F;200?timeout=${timeout}`
};

pub fn main() {
    dbg(VALUE, LIMIT);
}</div>
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    <div class="rune-footnote">VALUE and LIMIT is calculated once, reducing the work needed at runtime</div>
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