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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>2 Racket Essentials</title><link rel="stylesheet" type="text/css" href="../scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="../racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-style.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../doc-site.css" title="default"/><script type="text/javascript" src="../scribble-common.js"></script><script type="text/javascript" src="../manual-racket.js"></script><script type="text/javascript" src="../manual-racket.js"></script><script type="text/javascript" src="../doc-site.js"></script><script type="text/javascript" src="../local-redirect/local-redirect.js"></script><script type="text/javascript" src="../local-redirect/local-user-redirect.js"></script><!--[if IE 6]><style type="text/css">.SIEHidden { overflow: hidden; }</style><![endif]--></head><body id="doc-racket-lang-org"><div class="tocset"><div class="tocview"><div class="tocviewlist tocviewlisttopspace"><div class="tocviewtitle"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_0");">►</a></td><td></td><td><a href="index.html" class="tocviewlink" data-pltdoc="x"><span style="font-weight: bold">The Racket Guide</span></a></td></tr></table></div><div class="tocviewsublisttop" style="display: none;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1 </td><td><a href="intro.html" class="tocviewlink" data-pltdoc="x">Welcome to Racket</a></td></tr><tr><td align="right">2 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Racket Essentials</a></td></tr><tr><td align="right">3 </td><td><a href="datatypes.html" class="tocviewlink" data-pltdoc="x">Built-<wbr></wbr>In Datatypes</a></td></tr><tr><td align="right">4 </td><td><a href="scheme-forms.html" class="tocviewlink" data-pltdoc="x">Expressions and Definitions</a></td></tr><tr><td align="right">5 </td><td><a href="define-struct.html" class="tocviewlink" data-pltdoc="x">Programmer-<wbr></wbr>Defined Datatypes</a></td></tr><tr><td align="right">6 </td><td><a href="modules.html" class="tocviewlink" data-pltdoc="x">Modules</a></td></tr><tr><td align="right">7 </td><td><a href="contracts.html" class="tocviewlink" data-pltdoc="x">Contracts</a></td></tr><tr><td align="right">8 </td><td><a href="i_o.html" class="tocviewlink" data-pltdoc="x">Input and Output</a></td></tr><tr><td align="right">9 </td><td><a href="regexp.html" class="tocviewlink" data-pltdoc="x">Regular Expressions</a></td></tr><tr><td align="right">10 </td><td><a href="control.html" class="tocviewlink" data-pltdoc="x">Exceptions and Control</a></td></tr><tr><td align="right">11 </td><td><a href="for.html" class="tocviewlink" data-pltdoc="x">Iterations and Comprehensions</a></td></tr><tr><td align="right">12 </td><td><a href="match.html" class="tocviewlink" data-pltdoc="x">Pattern Matching</a></td></tr><tr><td align="right">13 </td><td><a href="classes.html" class="tocviewlink" data-pltdoc="x">Classes and Objects</a></td></tr><tr><td align="right">14 </td><td><a href="units.html" class="tocviewlink" data-pltdoc="x">Units (Components)</a></td></tr><tr><td align="right">15 </td><td><a href="reflection.html" class="tocviewlink" data-pltdoc="x">Reflection and Dynamic Evaluation</a></td></tr><tr><td align="right">16 </td><td><a href="macros.html" class="tocviewlink" data-pltdoc="x">Macros</a></td></tr><tr><td align="right">17 </td><td><a href="languages.html" class="tocviewlink" data-pltdoc="x">Creating Languages</a></td></tr><tr><td align="right">18 </td><td><a href="concurrency.html" class="tocviewlink" data-pltdoc="x">Concurrency and Synchronization</a></td></tr><tr><td align="right">19 </td><td><a href="performance.html" class="tocviewlink" data-pltdoc="x">Performance</a></td></tr><tr><td align="right">20 </td><td><a href="parallelism.html" class="tocviewlink" data-pltdoc="x">Parallelism</a></td></tr><tr><td align="right">21 </td><td><a href="running.html" class="tocviewlink" data-pltdoc="x">Running and Creating Executables</a></td></tr><tr><td align="right">22 </td><td><a href="More_Libraries.html" class="tocviewlink" data-pltdoc="x">More Libraries</a></td></tr><tr><td align="right">23 </td><td><a href="dialects.html" class="tocviewlink" data-pltdoc="x">Dialects of Racket and Scheme</a></td></tr><tr><td align="right">24 </td><td><a href="other-editors.html" class="tocviewlink" data-pltdoc="x">Command-<wbr></wbr>Line Tools and Your Editor of Choice</a></td></tr><tr><td align="right"></td><td><a href="doc-bibliography.html" class="tocviewlink" data-pltdoc="x">Bibliography</a></td></tr><tr><td align="right"></td><td><a href="doc-index.html" class="tocviewlink" data-pltdoc="x">Index</a></td></tr></table></div></div><div class="tocviewlist"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_1");">▼</a></td><td>2 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Racket Essentials</a></td></tr></table><div class="tocviewsublistbottom" style="display: block;" id="tocview_1"><table cellspacing="0" cellpadding="0"><tr><td align="right">2.1 </td><td><a href="Simple_Values.html" class="tocviewlink" data-pltdoc="x">Simple Values</a></td></tr><tr><td align="right">2.2 </td><td><a href="syntax-overview.html" class="tocviewlink" data-pltdoc="x">Simple Definitions and Expressions</a></td></tr><tr><td align="right">2.3 </td><td><a href="Lists__Iteration__and_Recursion.html" class="tocviewlink" data-pltdoc="x">Lists, Iteration, and Recursion</a></td></tr><tr><td align="right">2.4 </td><td><a href="Pairs__Lists__and_Racket_Syntax.html" class="tocviewlink" data-pltdoc="x">Pairs, Lists, and Racket Syntax</a></td></tr></table></div></div></div></div><div class="maincolumn"><div class="main"><div class="navsettop"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, "6.1", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.1");">top</a></span><span class="navright"> <a href="intro.html" title="backward to "1 Welcome to Racket"" data-pltdoc="x">← prev</a> <a href="index.html" title="up to "The Racket Guide"" data-pltdoc="x">up</a> <a href="Simple_Values.html" title="forward to "2.1 Simple Values"" data-pltdoc="x">next →</a></span> </div><h3 x-source-module="(lib "scribblings/guide/guide.scrbl")" x-part-tag=""to-scheme"">2<tt> </tt><a name="(part._to-scheme)"></a>Racket Essentials</h3><p>This chapter provides a quick introduction to Racket as background for
the rest of the guide. Readers with some Racket experience can safely
skip to <a href="datatypes.html" data-pltdoc="x">Built-In Datatypes</a>.</p><table cellspacing="0" cellpadding="0"><tr><td><p><span class="hspace"> </span><a href="Simple_Values.html" class="toclink" data-pltdoc="x">2.1<span class="hspace"> </span>Simple Values</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="syntax-overview.html" class="toclink" data-pltdoc="x">2.2<span class="hspace"> </span>Simple Definitions and Expressions</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="syntax-overview.html#%28part._.Definitions%29" class="toclink" data-pltdoc="x">2.2.1<span class="hspace"> </span>Definitions</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="syntax-overview.html#%28part._indentation%29" class="toclink" data-pltdoc="x">2.2.2<span class="hspace"> </span>An Aside on Indenting Code</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="syntax-overview.html#%28part._.Identifiers%29" class="toclink" data-pltdoc="x">2.2.3<span class="hspace"> </span>Identifiers</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="syntax-overview.html#%28part._.Function_.Calls__.Procedure_.Applications_%29" class="toclink" data-pltdoc="x">2.2.4<span class="hspace"> </span>Function Calls (Procedure Applications)</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="syntax-overview.html#%28part._.Conditionals_with_if__and__or__and_cond%29" class="toclink" data-pltdoc="x">2.2.5<span class="hspace"> </span>Conditionals with <span class="RktSym"><span class="RktStxLink">if</span></span>, <span class="RktSym"><span class="RktStxLink">and</span></span>, <span class="RktSym"><span class="RktStxLink">or</span></span>, and <span class="RktSym"><span class="RktStxLink">cond</span></span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="syntax-overview.html#%28part._.Function_.Calls__.Again%29" class="toclink" data-pltdoc="x">2.2.6<span class="hspace"> </span>Function Calls, Again</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="syntax-overview.html#%28part._.Anonymous_.Functions_with_lambda%29" class="toclink" data-pltdoc="x">2.2.7<span class="hspace"> </span>Anonymous Functions with <span class="RktSym"><span class="RktStxLink">lambda</span></span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="syntax-overview.html#%28part._local-binding-intro%29" class="toclink" data-pltdoc="x">2.2.8<span class="hspace"> </span>Local Binding with
<span class="RktSym"><span class="RktStxLink">define</span></span>, <span class="RktSym"><span class="RktStxLink">let</span></span>, and <span class="RktSym"><span class="RktStxLink">let*</span></span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Lists__Iteration__and_Recursion.html" class="toclink" data-pltdoc="x">2.3<span class="hspace"> </span>Lists, Iteration, and Recursion</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Lists__Iteration__and_Recursion.html#%28part._.Predefined_.List_.Loops%29" class="toclink" data-pltdoc="x">2.3.1<span class="hspace"> </span>Predefined List Loops</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Lists__Iteration__and_Recursion.html#%28part._.List_.Iteration_from_.Scratch%29" class="toclink" data-pltdoc="x">2.3.2<span class="hspace"> </span>List Iteration from Scratch</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Lists__Iteration__and_Recursion.html#%28part._tail-recursion%29" class="toclink" data-pltdoc="x">2.3.3<span class="hspace"> </span>Tail Recursion</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Lists__Iteration__and_Recursion.html#%28part._.Recursion_versus_.Iteration%29" class="toclink" data-pltdoc="x">2.3.4<span class="hspace"> </span>Recursion versus Iteration</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Pairs__Lists__and_Racket_Syntax.html" class="toclink" data-pltdoc="x">2.4<span class="hspace"> </span>Pairs, Lists, and Racket Syntax</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Pairs__Lists__and_Racket_Syntax.html#%28part._quoting-lists%29" class="toclink" data-pltdoc="x">2.4.1<span class="hspace"> </span>Quoting Pairs and Symbols with <span class="RktSym"><span class="RktStxLink">quote</span></span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Pairs__Lists__and_Racket_Syntax.html#%28part._.Abbreviating_quote_with__%29" class="toclink" data-pltdoc="x">2.4.2<span class="hspace"> </span>Abbreviating <span class="RktSym"><span class="RktStxLink">quote</span></span> with <span class="RktVal">’</span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Pairs__Lists__and_Racket_Syntax.html#%28part._lists-and-syntax%29" class="toclink" data-pltdoc="x">2.4.3<span class="hspace"> </span>Lists and Racket Syntax</a></p></td></tr></table><div class="navsetbottom"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, "6.1", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.1");">top</a></span><span class="navright"> <a href="intro.html" title="backward to "1 Welcome to Racket"" data-pltdoc="x">← prev</a> <a href="index.html" title="up to "The Racket Guide"" data-pltdoc="x">up</a> <a href="Simple_Values.html" title="forward to "2.1 Simple Values"" data-pltdoc="x">next →</a></span> </div></div></div><div id="contextindicator"> </div></body></html>
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