223 lines
7.0 KiB
HTML
223 lines
7.0 KiB
HTML
<!doctype html>
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<html lang='en' class='no-js '>
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<head>
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<meta charset='utf-8'>
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<meta content='width=device-width, initial-scale=1.0' name='viewport'>
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<link href='./assets/favicon.png' rel='shortcut icon'>
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<meta content='/ruby.html' name='app:pageurl'>
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<title>Ruby cheatsheet</title>
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<meta content='Ruby cheatsheet' property='og:title'>
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<meta content='Ruby cheatsheet' property='twitter:title'>
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<meta content='article' property='og:type'>
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<meta content='https://assets.devhints.io/previews/ruby.jpg?t=20200622151222' property='og:image'>
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<meta content='900' property='og:image:width'>
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<meta content='471' property='og:image:height'>
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<meta content="The one-page guide to Ruby: usage, examples, links, snippets, and more." name="description">
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<meta content="The one-page guide to Ruby: usage, examples, links, snippets, and more." property="og:description">
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<meta content="The one-page guide to Ruby: usage, examples, links, snippets, and more." property="twitter:description">
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<link rel="canonical" href="https://devhints.io/ruby">
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<meta name="og:url" content="https://devhints.io/ruby">
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<meta content='Devhints.io cheatsheets' property='og:site_name'>
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<meta content='Ruby' property='article:section'>
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<script async src='https://www.googletagmanager.com/gtag/js?id=UA-106902774-1'></script>
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<script>
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window.dataLayer=window.dataLayer||[];
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function gtag(){dataLayer.push(arguments)};
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gtag('js',new Date());
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gtag('config','UA-106902774-1');
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</script>
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<meta property='page:depth' content='1'>
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<script>(function(H){H.className=H.className.replace(/\bno-js\b/,'js')})(document.documentElement)</script>
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<script>(function(H){H.className=H.className.replace(/\bNoJs\b/,'WithJs')})(document.documentElement)</script>
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<script>(function(d,s){if(window.Promise&&[].includes&&Object.assign&&window.Map)return;var js,sc=d.getElementsByTagName(s)[0];js=d.createElement(s);js.src='https://cdn.polyfill.io/v2/polyfill.min.js';sc.parentNode.insertBefore(js, sc);}(document,'script'))</script>
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<!--[if lt IE 9]><script src='https://cdnjs.cloudflare.com/ajax/libs/nwmatcher/1.2.5/nwmatcher.min.js'></script><script src='https://cdnjs.cloudflare.com/ajax/libs/json2/20140204/json2.js'></script><script src='https://cdn.rawgit.com/gisu/selectivizr/1.0.3/selectivizr.js'></script><script src='https://cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.3/html5shiv.min.js'></script><script src='https://cdnjs.cloudflare.com/ajax/libs/respond.js/1.4.2/respond.js'></script><![endif]-->
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<style>html{opacity:0}</style>
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<link rel="stylesheet" href="./assets/2015/style.css?t=20200622151222">
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<link href="./assets/style.css?t=20200622151222" rel="stylesheet" />
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<link href="./assets/print.css?t=20200622151222" rel="stylesheet" media="print" />
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</head>
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<body>
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<div class='all'>
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<div class='site-header'>
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<div class='container'>
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This is <a href="."><em>Devhints.io cheatsheets</em></a> — a collection of cheatsheets I've written.
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</div>
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</div>
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<script type='application/ld+json'>
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{
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"@type": "NewsArticle",
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"@id": "https://google.com/article"
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},
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"headline": "Ruby cheatsheet",
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"image": [ "https://assets.devhints.io/previews/ruby.jpg?t=20200622151222" ],
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"description": "The one-page guide to Ruby: usage, examples, links, snippets, and more."
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}
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</script>
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<script type='application/ld+json'>
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{
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"@context": "http://schema.org",
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"@type": "BreadcrumbList",
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"itemListElement": [{
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"@type": "ListItem",
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"position": 1,
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"item": {
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"@id": "https://devhints.io/#ruby",
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"name": "Ruby"
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}
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},{
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"@type": "ListItem",
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"position": 2,
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"item": {
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"@id": "https://devhints.io/ruby",
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"name": "Ruby"
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}
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}]
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}
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</script>
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<div class='post-list -single -cheatsheet'>
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<div class='post-item'>
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<div class='post-headline -cheatsheet'>
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<p class='prelude'><span></span></p>
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<h1><span>Ruby</span></h1>
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<ul class="social-list ">
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<li class="facebook link hint--bottom" data-hint="Share on Facebook"><a href="https://www.facebook.com/sharer/sharer.php?u=https://devhints.io/ruby.html" target="share"><span class="text"></span></a></li>
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<li class="twitter link hint--bottom" data-hint="Share on Twitter"><a href="https://twitter.com/intent/tweet?text=The%20ultimate%20cheatsheet%20for%20Ruby.%20https://devhints.io/ruby.html" target="share"><span class="text"></span></a></li>
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</ul>
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</div>
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<div class='post-content -cheatsheet'>
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<ul>
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<li><code>$!</code> - latest error message</li>
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<li><code>$@</code> - location of error</li>
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<li><code>$_</code> - string last read by gets</li>
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<li><code>$.</code> - line number last read by interpreter</li>
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<li><code>$&</code> - string last matched by regexp</li>
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<li><code>$~</code> - the last regexp match, as an array of subexpressions</li>
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<li><code>$n</code> - the nth subexpression in the last match (same as <code>$~[n]</code>)</li>
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<li><code>$=</code> - case-insensitivity flag</li>
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<li><code>$/</code> - input record separator</li>
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<li><code>$\</code> - output record separator</li>
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<li><code>$0</code> - the name of the ruby script file</li>
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<li><code>$*</code> (or <code>ARGV</code>) - the command line arguments</li>
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<li><code>$$</code> - interpreter’s process ID</li>
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<li><code>$?</code> - exit status of last executed child process</li>
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<li><code>$-i</code> <code>$-l</code> <code>$-p</code> <code>$-v</code> - Command line switches</li>
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<li><code>$-v</code> (or <code>$VERBOSE</code>) - verbose mode</li>
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</ul>
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</div>
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<ul class="social-list ">
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<li class="facebook link hint--bottom" data-hint="Share on Facebook"><a href="https://www.facebook.com/sharer/sharer.php?u=https://devhints.io/ruby.html" target="share"><span class="text"></span></a></li>
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<li class="twitter link hint--bottom" data-hint="Share on Twitter"><a href="https://twitter.com/intent/tweet?text=The%20ultimate%20cheatsheet%20for%20Ruby.%20https://devhints.io/ruby.html" target="share"><span class="text"></span></a></li>
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</ul>
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</div>
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</div>
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<div class="about-the-site">
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<div class="container">
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<p class='blurb'>
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<strong><a href=".">Devhints.io cheatsheets</a></strong> is a collection of cheatsheets I've written over the years.
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Suggestions and corrections? <a href='https://github.com/rstacruz/cheatsheets/issues/907'>Send them in</a>.
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<i class='fleuron'></i>
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I'm <a href="http://ricostacruz.com">Rico Sta. Cruz</a>.
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Check out my <a href="http://ricostacruz.com/til">Today I learned blog</a> for more.
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</p>
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<p class='back'>
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<a class='big-button -back -slim' href='.#toc'></a>
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</p>
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<p>
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</p>
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</div>
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</div>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/8.5/highlight.min.js"></script>
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<script src="https://cdn.rawgit.com/rstacruz/unorphan/v1.0.1/index.js"></script>
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<script>hljs.initHighlightingOnLoad()</script>
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<script>unorphan('h1, h2, h3, p, li, .unorphan')</script>
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</body>
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</html>
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