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<!DOCTYPE html>
<html lang="en">
<head>
<title>
Functional Java
</title>
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<div class="sect1">
<h2 id="_overview">Overview</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Functional Java is an open source library facilitating functional programming in Java. The library implements numerous basic and advanced programming abstractions that assist composition oriented development. Functional Java also serves as a platform for learning functional programming concepts by introducing these concepts using a familiar language.</p>
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<div class="paragraph">
<p>The library is intended for use in production applications and is thoroughly tested using the technique of automated specification-based testing with <a href="http://www.scalacheck.org">ScalaCheck</a> and Functional Java’s Quickcheck module. The latest version, 5.0, is compiled with Java 8 targeting Java 8 bytecode. The 4.x series targets Java 6 bytecode. The future 6.x series and 7.x series target Java 11 and 17 respectively. The use of lambdas within the project for the 4.x releases are backported with the <a href="https://github.com/orfjackal/retrolambda">Retro Lambda</a> library.</p>
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<h2 id="_features">Features</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Functional Java provides abstractions for the following types:</p>
</div>
<div class="ulist">
<ul>
<li> <p>Basic Data Structures - total and partial functions, products, unit, option, unbiased and right biased unions (either and validation), void.</p> </li>
<li> <p>Immutable Collections - array, list, vector, stream, set, map, finger tree, priority queue, heterogenous list, difference lists.</p> </li>
<li> <p>Other Abstractions - monoid, semigroup, natural, random number generator, reader, writer, state, input/output, parser, zipper, specification based testing, actors, concurrency, optics (lens, prism, fold, traversal and others) and type conversion.</p> </li>
</ul>
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<p>See the <a href="features.html">features page</a> for a brief description of each of these types.</p>
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<div class="sect1">
<h2 id="_example">Example</h2>
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<div class="paragraph">
<p>Read the <a href="quickstart.html">quick start guide</a> for how to add FunctionalJava to your project and get started with a full example.</p>
</div>
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<p>Functional Java includes numerous usage examples, this example maps a function over an array, adding 42 to each element (imports omitted).</p>
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<pre class="prettyprint highlight"><code class="language-java" data-lang="java">final Array<Integer> a = array(1, 2, 3);
final Array<Integer> b = a.map(i -> i + 42);
arrayShow(intShow).println(b); // {43,44,45}
// combine into a single step
arrayShow(intShow).println(array(1, 2, 3).map(i -> i + 42));</code></pre>
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