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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><meta name="viewport" content="width=device-width, initial-scale=0.8"/><title>4 Expressions and Definitions</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">The Racket Guide</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="to-scheme.html" class="tocviewlink" 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="tocviewselflink" 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</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="
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forms: definitions, procedure applications, conditionals, and so
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on. This section provides more details on those forms, plus a few
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additional basic forms.</p><table cellspacing="0" cellpadding="0"><tr><td><p><span class="hspace"> </span><a href="syntax-notation.html" class="toclink" data-pltdoc="x">4.1<span class="hspace"> </span>Notation</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="binding.html" class="toclink" data-pltdoc="x">4.2<span class="hspace"> </span>Identifiers and Binding</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="application.html" class="toclink" data-pltdoc="x">4.3<span class="hspace"> </span>Function Calls (Procedure Applications)</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="application.html#%28part._.Evaluation_.Order_and_.Arity%29" class="toclink" data-pltdoc="x">4.3.1<span class="hspace"> </span>Evaluation Order and Arity</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="application.html#%28part._keyword-args%29" class="toclink" data-pltdoc="x">4.3.2<span class="hspace"> </span>Keyword Arguments</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="application.html#%28part._apply%29" class="toclink" data-pltdoc="x">4.3.3<span class="hspace"> </span>The <span class="RktSym"><span class="RktValLink">apply</span></span> Function</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="lambda.html" class="toclink" data-pltdoc="x">4.4<span class="hspace"> </span>Functions (Procedures): <span class="RktSym"><span class="RktStxLink">lambda</span></span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="lambda.html#%28part._rest-args%29" class="toclink" data-pltdoc="x">4.4.1<span class="hspace"> </span>Declaring a Rest Argument</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="lambda.html#%28part._.Declaring_.Optional_.Arguments%29" class="toclink" data-pltdoc="x">4.4.2<span class="hspace"> </span>Declaring Optional Arguments</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="lambda.html#%28part._lambda-keywords%29" class="toclink" data-pltdoc="x">4.4.3<span class="hspace"> </span>Declaring Keyword Arguments</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="lambda.html#%28part._case-lambda%29" class="toclink" data-pltdoc="x">4.4.4<span class="hspace"> </span>Arity-Sensitive Functions: <span class="RktSym"><span class="RktStxLink">case-lambda</span></span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="define.html" class="toclink" data-pltdoc="x">4.5<span class="hspace"> </span>Definitions: <span class="RktSym"><span class="RktStxLink">define</span></span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="define.html#%28part._.Function_.Shorthand%29" class="toclink" data-pltdoc="x">4.5.1<span class="hspace"> </span>Function Shorthand</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="define.html#%28part._.Curried_.Function_.Shorthand%29" class="toclink" data-pltdoc="x">4.5.2<span class="hspace"> </span>Curried Function Shorthand</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="define.html#%28part._multiple-values%29" class="toclink" data-pltdoc="x">4.5.3<span class="hspace"> </span>Multiple Values and <span class="RktSym"><span class="RktStxLink">define-values</span></span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="define.html#%28part._intdefs%29" class="toclink" data-pltdoc="x">4.5.4<span class="hspace"> </span>Internal Definitions</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="
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