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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>Functional Language Features: Iterators and Closures</title>
+</head>
+<body>
+<h1 id="functional-language-features-iterators-and-closures"><a class="header" href="#functional-language-features-iterators-and-closures">Functional Language Features: Iterators and Closures</a></h1>
+<p>Rust’s design has taken inspiration from many existing languages and
+techniques, and one significant influence is <em>functional programming</em>.
+Programming in a functional style often includes using functions as values by
+passing them in arguments, returning them from other functions, assigning them
+to variables for later execution, and so forth.</p>
+<p>In this chapter, we won’t debate the issue of what functional programming is or
+isn’t but will instead discuss some features of Rust that are similar to
+features in many languages often referred to as functional.</p>
+<p>More specifically, we’ll cover:</p>
+<ul>
+<li><em>Closures</em>, a function-like construct you can store in a variable</li>
+<li><em>Iterators</em>, a way of processing a series of elements</li>
+<li>How to use closures and iterators to improve the I/O project in Chapter 12</li>
+<li>The performance of closures and iterators (spoiler alert: They’re faster than
+you might think!)</li>
+</ul>
+<p>We’ve already covered some other Rust features, such as pattern matching and
+enums, that are also influenced by the functional style. Because mastering
+closures and iterators is an important part of writing fast, idiomatic, Rust
+code, we’ll devote this entire chapter to them.</p>
+</body>
+</html>