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<body id="page-top" class="five-years">
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<a class="page-scroll" href="//docs.vavr.io/">Docs</a>
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<h1 class="brand-heading">
<img class="brand-heading" src="img/vavr-logo.png" />
</h1>
<h2 class="brand-heading">
<strong>vavr</strong> - turns java<span class="java-tm">™</span> upside down
</h2>
<p style="font-size: 0.8em; color: rgba(255, 255, 255, 0.5)">
Oracle and Java are registered trademarks of Oracle and/or its affiliates. Other names may be trademarks of their respective owners.<br>
</p>
</div>
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<div class="carousel-inner" role="listbox">
<div class="item active">
<div class="container">
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<h2>⭐️ VAVR HAS A NEW OWNER ⭐️</h2>
<p style="font-size: 1.5em">
Since 2024, <a href="https://github.com/pivovarit">Grzegorz Piwowarek</a> is taking full ownership of the project!
<br><br> Announcement: <a href="https://x.com/pivovarit/status/1814901872005697824">Twitter/X</a>
</p>
</div>
</div>
</div>
<div class="item">
<div class="container">
<div class="carousel-caption">
<p>A new powerful collection library saves us from source.stream().really("?").collect(sink()) pipelines.</p>
<pre><code class="language-java">List<String> names = persons
.filter(p -> p.age > 12)
.map(Person::getName);</code></pre>
</div>
</div>
</div>
<div class="item">
<div class="container">
<div class="carousel-caption">
<p>The functional <em>For</em> is an expression that <em>yields</em> a value. The result is a lazy evaluated collection of elements.</p>
<pre><code class="language-java">Iterator<String> iterator =
For(persons.filter(Person::hasAddress), p ->
For(p.addresses).yield(a ->
p.name + "," + a.street
)
);</code></pre>
</div>
</div>
</div>
<div class="item">
<div class="container">
<div class="carousel-caption">
<p>Vavr and Java are fully interoperable.</p>
<pre><code class="language-java">java.util.List<Integer> result =
iterator.map(String::length).asJava();</code></pre>
</div>
</div>
</div>
<div class="item">
<div class="container">
<div class="carousel-caption">
<p>Structural <em>pattern matching</em> is an easy way to <em>decompose</em> values. The result is ... a value!</p>
<pre><code class="language-java">Number num = Match(personOption).of(
Case($Some($Person($())), person -> 1.0d),
Case($None(), 0)
);</code></pre>
</div>
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</div>
<div class="item">
<div class="container">
<div class="carousel-caption">
<p>The <em>Try</em> monad represents the result state of a computation which may be a <em>Success</em> or a <em>Failure</em>.</p>
<pre><code class="language-java">R result = Try(() -> mightFail())
.recover(x -> ...)
.getOrElse(defaultValue);</code></pre>
</div>
</div>
</div>
<div class="item">
<div class="container">
<div class="carousel-caption">
<p>Java's <em>Optional</em> is not Serializable. We use Vavr's <em>Option</em> for remote operations. Check out our JSON module!</p>
<pre><code class="language-java">class Person implements Serializable {
final Option<String> title;
final String name;
...
}</code></pre>
</div>
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<div class="container">
<div class="row">
<div class="col-lg-8 col-lg-offset-2 text-center">
<h2 class="section-heading">Downloads</h2>
<hr class="light">
<p class="text-faded">Vavr <em>core</em> is a functional library for Java. It helps to reduce the amount of code and to increase the robustness. A first step towards functional programming is to start thinking in immutable values. Vavr provides immutable collections and the necessary functions and control structures to operate on these values. The results are beautiful and just work.</p>
</div>
</div>
<div class="row">
<div class="col-lg-3 col-md-6 text-center">
<div class="feature-box-primary">
<a target="_blank" href="http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22io.vavr%22%20a%3A%22vavr%22">
<i class="fa fa-4x fa-cloud-download"></i>
<h3>Binaries</h3>
<p class="text-faded">The Vavr binaries can be found on Maven Central. Beside with Gradle and Maven they work also standalone.</p>
</a>
</div>
</div>
<div class="col-lg-3 col-md-6 text-center">
<div class="feature-box-primary">
<a target="_blank" href="http://docs.vavr.io">
<i class="fa fa-4x fa-book"></i>
<h3>Documentation</h3>
<p class="text-faded">The documentation gives an overview and covers the concepts in depth. It is the best way to get started with Vavr.</p>
</a>
</div>
</div>
<div class="col-lg-3 col-md-6 text-center">
<div class="feature-box-primary">
<a target="_blank" href="http://www.javadoc.io/doc/io.vavr/vavr">
<i class="fa fa-4x fa-file-text"></i>
<h3>API Docs</h3>
<p class="text-faded">The Javadoc can be browsed online.</p>
</a>
</div>
</div>
<div class="col-lg-3 col-md-6 text-center">
<div class="feature-box-primary">
<a target="_blank" href="https://github.com/vavr-io/vavr">
<i class="fa fa-4x fa-github"></i>
<h3>Source Code</h3>
<p class="text-faded">Vavr is open source and can be found on Github. It is distributed under the Apache 2.0 License.</p>
</a>
</div>
</div>
</div>
</div>
</section>
<section class="bg-light" id="modules">
<div class="container">
<div class="row">
<div class="col-lg-8 col-lg-offset-2 text-center">
<h2 class="section-heading">Vavr Modules</h2>
<hr class="primary">
<p>There are several additional modules that group around Vavr's <em>core</em>. All of these are supported by the Vavr open source organization.</p>
</div>
</div>
<div class="row">
<div class="col-md-4 text-center">
<div class="feature-box">
<a target="_blank" href="https://github.com/vavr-io/vavr-gwt">
<i class="fa fa-4x fa-cube" data-wow-delay=".3s"></i>
<h3>vavr-gwt</h3>
<p class="text-muted">GWT module for Vavr.</p>
</a>
</div>
</div>
<div class="col-md-4 text-center">
<div class="feature-box">
<a target="_blank" href="https://github.com/vavr-io/vavr-match">
<i class="fa fa-4x fa-cube" data-wow-delay=".1s"></i>
<h3>vavr-match</h3>
<p class="text-muted">Adds compile time support for Vavr's structural pattern matching feature.</p>
</a>
</div>
</div>
<div class="col-md-4 text-center">
<div class="feature-box">
<a target="_blank" href="https://github.com/vavr-io/vavr-test">
<i class="fa fa-4x fa-cube" data-wow-delay=".1s"></i>
<h3>vavr-test</h3>
<p class="text-muted">A property check framework for random testing of program properties.</p>
</a>
</div>
</div>
</div>
</div>
<div class="container">
<div class="row">
<div class="col-md-4 text-center">
<div class="feature-box">
<a target="_blank" href="https://github.com/vavr-io/vavr-jackson">
<i class="fa fa-4x fa-cube" data-wow-delay=".3s"></i>
<h3>vavr-jackson</h3>
<p class="text-muted">Jackson datatype module, the standard JSON library for Java.</p>
</a>
</div>
</div>
<div class="col-md-4 text-center">
<div class="feature-box">
<a target="_blank" href="https://github.com/vavr-io/vavr-gson">
<i class="fa fa-4x fa-cube" data-wow-delay=".3s"></i>
<h3>vavr-gson</h3>
<p class="text-muted">Gson datatype module for Vavr.</p>
</a>
</div>
</div>
<div class="col-md-4 text-center">
<div class="feature-box">
<a target="_blank" href="https://github.com/vavr-io/vavr-render">
<i class="fa fa-4x fa-cube" data-wow-delay=".3s"></i>
<h3>vavr-render</h3>
<p class="text-muted">A rendering library, currently housing tree renderers (ascii and graphviz).</p>
</a>
</div>
</div>
<div class="col-md-4 text-center">
</div>
</div>
</div>
</section>
<aside class="bg-dark call-to-action" id="contact">
<div class="container text-center">
<div class="row">
<div class="col-lg-8 col-lg-offset-2 text-center">
<h2>Please visit our <a target="_blank" href="//blog.vavr.io"><strong>Blog</strong></a> or find us here:</h2>
</div>
</div>
</div>
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<div class="col-md-3"></div>
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<a target="_blank" href="https://gitter.im/vavr-io/vavr">
<i class="fa fa-4x fa-align-right" style="transform: rotate(90deg)"></i>
<h3>Gitter Chat</h3>
</a>
</div>
</div>
<div class="col-md-2 text-center">
<div class="feature-box-primary">
<a target="_blank" href="https://twitter.com/vavr_io">
<i class="fa fa-4x fa-twitter"></i>
<h3>Twitter</h3>
</a>
</div>
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<div class="col-md-2 text-center">
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<a target="_blank" href="mailto:[email protected]">
<i class="fa fa-4x fa-envelope"></i>
<h3>Email</h3>
</a>
</div>
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<div class="col-md-3"></div>
</div>
</div>
</aside>
<aside class="bg-light">
<div class="container">
<div class="row">
<div class="col-lg-8 col-lg-offset-2 text-center">
<h2 class="section-heading">Thank you for using Vavr!</h2>
<hr class="primary">
<img class="img-responsive tweets" src="img/media/tweets.png">
</div>
</div>
</div>
</aside>
<aside id="supporters">
<div class="container text-center">
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<div class="col-lg-8 col-lg-offset-2 text-center">
<h2>Our Sponsors</h2>
</div>
</div>
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<div class="col-md-4 feature-box">
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<a href="https://www.jetbrains.com/idea/" target="_blank">
<img class="supporter-logo idea-logo" src="img/icon_IntelliJIDEA.svg">
</a>
</div>
<p>
<a href="https://www.jetbrains.com/idea/" target="_blank">IntelliJ IDEA</a> is our preferred IDE to develop Vavr.
<a href="https://www.jetbrains.com" target="_blank">JetBrains</a> supports open source projects with its products and makes professional software development a more productive and enjoyable experience.
</p>
</div>
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