content/ruby-compendium/book/core-stdlib.html
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<!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="copyright" content="Fabio Cevasco" /> <meta name="robots" content="all, follow" /> <meta name="Revisit-After" content="2 Days" /> <meta name="language" content="en" /> <meta name="target_country" content="en-us" /> <meta name="country" content="United States" /> <meta name="readability-verification" content="XmaVzRjmcFL5Bb2Fu9TZVdDKzhA3apQdxexTB2rK"/> <meta name="description" content="H3RALD - Fabio Cevasco's Web Site" /> <meta name="keywords" content="h3rald, fabio cevasco, ruby-compendium" /> <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/html5reset.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://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js" type="text/javascript"></script> <script src="/js/jquery-timeago.js" type="text/javascript"></script> <script src="/js/jquery-easing.js" type="text/javascript"></script> <script src="/js/jquery-fancybox.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> </head> <body> <section id="container"> <header class="page"> <nav class="home-link"> <a href="/"> <img src="/images/h3rald_small.png" alt="H3RALD" class="default"/> <![if !IE]> <img src="/images/h3rald_hover_small.png" alt="H3RALD" class="hover"/> <![endif]> </a> </nav> <nav class="section"> /<a href="/ruby-compendium/" rel="ruby-compendium">RUBY-COMPENDIUM</a> </nav> </header> <article class="page glyph-book"> <header> <hgroup> <h1>The Core and the Standard Library</h1> <h2>Ruby Compendium</h2> </hgroup> </header> <section id="body-text" class="hyphenate glyph-book"> <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> <nav id="sharing-buttons"> <a href="http://twitter.com/share" class="twitter-share-button" data-count="horizontal" data-via="h3rald">Tweet</a> <script type="text/javascript" src="http://platform.twitter.com/widgets.js"></script> <g:plusone size="medium"></g:plusone> <script type="text/javascript"> (function() { var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true; po.src = 'https://apis.google.com/js/plusone.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s); })(); </script> </nav> </section> </article> <footer> <section class="ads"> <script type="text/javascript"><!-- google_ad_client = "pub-2871497824158668"; /* 728x90, created 9/10/10 */ google_ad_slot = "3963343166"; google_ad_width = 728; google_ad_height = 90; //--> </script> <script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script> </section> <section> <nav> <a href="/about/">ABOUT</a>|<a href="/contact/">CONTACT</a> </nav> <p>H3RALD Web Site v8.1.2 © 2004 — 2011 <em>Fabio Cevasco</em></p> </section> </footer> </section><!-- #container end --> <!-- 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 ? 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