content/ruby-compendium/book/core-stdlib.html
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 |
<!DOCTYPE html>
<html lang="en">
<head>
<title>The Core and the Standard Library - Ruby Compendium</title>
<link href='http://fonts.googleapis.com/css?family=Crimson+Text:400,400italic,600,600italic,700,700italic' rel='stylesheet' type='text/css'>
<meta charset="utf-8" />
<meta name="author" content="Fabio Cevasco" />
<meta name="robots" content="all, follow" />
<meta name="Revisit-After" content="2 Days" />
<meta name="description" content="H3RALD - Fabio Cevasco's Web Site" />
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="keywords" content="h3rald, fabio cevasco, glyph, ruby, opensource" />
<link rel="shortcut icon" href="/favicon.png" type="image/png" />
<meta content="44.388041;9.073248" name="ICBM" />
<!-- <link rel="stylesheet" type="text/css" href="/styles/style.css" /> -->
<!--[if lt IE 9]>
<script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<link rel="stylesheet" type="text/css" href="/styles/bootstrap.css" />
<link rel="stylesheet" type="text/css" href="/styles/style.css" />
<script src="http://www.google.com/jsapi?key=ABQIAAAAr6RY1Z6dchG_sX9WDLSy3xRlq2n1sm52B5HDRR5tm6o8XM18FhR56xHNNH6CsX86uN5VoTrglpyOyQ" type="text/javascript"></script>
<script src="/js/sevenup.js" type="text/javascript"></script>
<script src="/js/sevenup_black.js" type="text/javascript"></script>
<script src="http://code.jquery.com/jquery-latest.js" type="text/javascript"></script>
<script src="/js/jquery-timeago.js" type="text/javascript"></script>
<script src="/js/date.js" type="text/javascript"></script>
<script src="/js/feeds.js" type="text/javascript"></script>
<script src="/js/hyphenator.js" type="text/javascript"></script>
<script src="/js/init.js" type="text/javascript"></script>
<script src="/js/search.js" type="text/javascript"></script>
<script src="/js/bootstrap.js" type="text/javascript"></script>
</head>
<body>
<div class="container">
<div class="row" id="header-row">
<div class="span6 main-title">
<h1>
<a href="/"><img src="/img/h3rald.png" alt="H3RALD" /></a>
</h1>
</div>
<div class="span4 offset2">
<div class="gcse-searchbox" data-enableAutoComplete="true"></div>
</div>
</div>
<div id="search_results">
<div class="gcse-searchresults" data-linkTarget="_top"></div>
</div>
<div id=main-navbar class="navbar navbar-inverse">
<div class="navbar-inner">
<button type="button" class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<div class="nav-collapse collapse">
<ul class="nav">
<li><a href="/">HOME</a></li>
<li><a href="/projects/">PROJECTS</a></li>
<li><a href="/tags/">TAGS</a></li>
<li><a href="/archives/">ARCHIVES</a></li>
<li><a href="/about/">ABOUT</a></li>
<li><a href="/contact/">CONTACT</a></li>
</ul>
</div>
</div>
</div>
</div>
<div class="container">
<article class="page">
<header class="row">
<hgroup class="span9">
<h1>The Core and the Standard Library</h1>
<h2>Ruby Compendium</h2>
</hgroup>
</header>
<section id="body-text" class="hyphenate">
<nav class="navigation"><a href="/ruby-compendium/book/syntax.html">← Syntax</a> | <a href="/ruby-compendium/book/index.html">Contents</a> | <a href="/ruby-compendium/book/features.html">Advanced Language Features →</a></nav>
<p>By default, Ruby always loads its core classes and modules when a script is executed. This means that in all Ruby programs you can always instantiate core objects like:</p>
<ul>
<li>Numbers (integers, floats)</li>
<li>Strings</li>
<li>Arrays</li>
<li>Hashes</li>
<li>Files</li>
<li>Regular expressions</li>
<li>Symbols</li>
<li>Threads</li>
<li>Times and dates</li>
<li>…and many more.</li>
</ul>
<p>Most likely, this is not going to be enough. That’s when the Standard Library comes into play: it’s a large collection of internal libraries that ships with every Ruby implementations. There are libraries to connect to the Internet, to read/write to various file formats such as <span class="caps">CSV</span> or <span class="caps">YAML</span>, to work with files and paths, access system features, and so on.</p>
<p>Unlike core classes, standard libraries must be required specifically if needed, before they can be used.</p>
<aside class="box">
<div class="box-title">If you want to know more...</div>
<p>On core libraries and the Standard Library, checkout the official documentation:</p>
<ul>
<li><a href="http://www.ruby-doc.org/core/">Core Reference</a></li>
<li><a href="http://www.ruby-doc.org/stdlib/">Standard Library Reference</a></li>
</ul>
<p>Overwhelmed? Don’t know where to start? Familiarize yourself with the <a href="http://www.ruby-doc.org/core/classes/Enumerable.html">Enumerable</a> module; you won’t regret it!</p>
</aside>
<nav class="navigation"><a href="/ruby-compendium/book/syntax.html">← Syntax</a> | <a href="/ruby-compendium/book/index.html">Contents</a> | <a href="/ruby-compendium/book/features.html">Advanced Language Features →</a></nav>
</section>
</article>
</div>
<footer>
<section>
<p>H3RALD Web Site v8.3 © 2004 — 2013 <em>Fabio Cevasco</em></p>
</section>
</footer>
<!-- Start Google Analytics -->
<script type="text/javascript">
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-18587377-1']);
_gaq.push(['_trackPageview']);
(function() {
var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();
</script>
<!-- End Google Analytics -->
<!-- Start of StatCounter Code -->
<script type="text/javascript">
var sc_project=6193656;
var sc_invisible=1;
var sc_security="57f7ee2a";
</script>
<script type="text/javascript" src="http://www.statcounter.com/counter/counter_xhtml.js"></script>
<!-- End of StatCounter Code -->
</body>
</html>
|