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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>1.12 Working with Files and Directories: "dir.rkt"</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="../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="../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-style: italic">How to Design Programs</span> Teachpacks</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="htdp.html" class="tocviewselflink" data-pltdoc="x">Ht<span class="mywbr"> </span>DP Teachpacks</a></td></tr><tr><td align="right">2 </td><td><a href="2htdp2htdp.html" class="tocviewlink" data-pltdoc="x">Ht<span class="mywbr"> </span>DP/<span class="mywbr"> </span>2e Teachpacks</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>1 </td><td><a href="htdp.html" class="tocviewlink" data-pltdoc="x">Ht<span class="mywbr"> </span>DP Teachpacks</a></td></tr></table><div class="tocviewsublistbottom" style="display: block;" id="tocview_1"><table cellspacing="0" cellpadding="0"><tr><td align="right">1.1 </td><td><a href="image.html" class="tocviewlink" data-pltdoc="x">Manipulating Images:<span class="mywbr"> </span> <span class="stt">"image.rkt"</span><a name="(idx._(gentag._0._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.2 </td><td><a href="world.html" class="tocviewlink" data-pltdoc="x">Simulations and Animations:<span class="mywbr"> </span> <span class="stt">"world.rkt"</span><a name="(idx._(gentag._1._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.3 </td><td><a href="convert.html" class="tocviewlink" data-pltdoc="x">Converting Temperatures:<span class="mywbr"> </span> <span class="stt">"convert.rkt"</span><a name="(idx._(gentag._2._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.4 </td><td><a href="guess.html" class="tocviewlink" data-pltdoc="x">Guessing Numbers:<span class="mywbr"> </span> <span class="stt">"guess.rkt"</span><a name="(idx._(gentag._3._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.5 </td><td><a href="master.html" class="tocviewlink" data-pltdoc="x">Master<span class="mywbr"> </span>Minding:<span class="mywbr"> </span> <span class="stt">"master.rkt"</span><a name="(idx._(gentag._4._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.6 </td><td><a href="master-play.html" class="tocviewlink" data-pltdoc="x">Playing Master<span class="mywbr"> </span>Mind:<span class="mywbr"> </span> <span class="stt">"master-<wbr></wbr>play.rkt"</span><a name="(idx._(gentag._5._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.7 </td><td><a href="draw.html" class="tocviewlink" data-pltdoc="x">Simple Drawing:<span class="mywbr"> </span> <span class="stt">"draw.rkt"</span><a name="(idx._(gentag._6._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.8 </td><td><a href="hangman.html" class="tocviewlink" data-pltdoc="x">Hangman:<span class="mywbr"> </span> <span class="stt">"hangman.rkt"</span><a name="(idx._(gentag._7._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.9 </td><td><a href="hangman-play.html" class="tocviewlink" data-pltdoc="x">Playing Hangman:<span class="mywbr"> </span> <span class="stt">"hangman-<wbr></wbr>play.rkt"</span><a name="(idx._(gentag._8._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.10 </td><td><a href="arrow.html" class="tocviewlink" data-pltdoc="x">Managing Control Arrows:<span class="mywbr"> </span> <span class="stt">"arrow.rkt"</span><a name="(idx._(gentag._9._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.11 </td><td><a href="docs.html" class="tocviewlink" data-pltdoc="x">Manipulating Simple HTML Documents:<span class="mywbr"> </span> <span class="stt">"docs.rkt"</span><a name="(idx._(gentag._10._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.12 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Working with Files and Directories:<span class="mywbr"> </span> <span class="stt">"dir.rkt"</span><a name="(idx._(gentag._11._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.13 </td><td><a href="graphing.html" class="tocviewlink" data-pltdoc="x">Graphing Functions:<span class="mywbr"> </span> <span class="stt">"graphing.rkt"</span><a name="(idx._(gentag._12._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.14 </td><td><a href="gui.html" class="tocviewlink" data-pltdoc="x">Simple Graphical User Interfaces:<span class="mywbr"> </span> <span class="stt">"gui.rkt"</span><a name="(idx._(gentag._13._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.15 </td><td><a href="arrow-gui.html" class="tocviewlink" data-pltdoc="x">An Arrow GUI:<span class="mywbr"> </span> <span class="stt">"arrow-<wbr></wbr>gui.rkt"</span><a name="(idx._(gentag._14._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.16 </td><td><a href="elevator.html" class="tocviewlink" data-pltdoc="x">Controlling an Elevator:<span class="mywbr"> </span> <span class="stt">"elevator.rkt"</span><a name="(idx._(gentag._15._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.17 </td><td><a href="lkup-gui.html" class="tocviewlink" data-pltdoc="x">Lookup GUI:<span class="mywbr"> </span> <span class="stt">"lkup-<wbr></wbr>gui.rkt"</span><a name="(idx._(gentag._16._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.18 </td><td><a href="guess-gui.html" class="tocviewlink" data-pltdoc="x">Guess GUI:<span class="mywbr"> </span> <span class="stt">"guess-<wbr></wbr>gui.rkt"</span><a name="(idx._(gentag._17._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.19 </td><td><a href="show-queen.html" class="tocviewlink" data-pltdoc="x">Queens:<span class="mywbr"> </span> <span class="stt">"show-<wbr></wbr>queen.rkt"</span><a name="(idx._(gentag._18._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.20 </td><td><a href="matrix.html" class="tocviewlink" data-pltdoc="x">Matrix Functions:<span class="mywbr"> </span> <span class="stt">"matrix.rkt"</span><a name="(idx._(gentag._19._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr></table></div></div></div><div class="tocsub"><div class="tocsubtitle">On this page:</div><table class="tocsublist" cellspacing="0"><tr><td><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._dir%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym">dir</span></a></td></tr><tr><td><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._file%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">file</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._create-dir%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">create-<wbr></wbr>dir</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._date%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">date</span></span></a></td></tr></table></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, "6.7", "../");" 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("6.7");">top</a></span><span class="navright"> <a href="docs.html" title="backward to "1.11 Manipulating Simple HTML Documents: "docs.rkt""" data-pltdoc="x">← prev</a> <a href="htdp.html" title="up to "1 HtDP Teachpacks"" data-pltdoc="x">up</a> <a href="graphing.html" title="forward to "1.13 Graphing Functions: "graphing.rkt""" data-pltdoc="x">next →</a></span> </div><h4 x-source-module="(lib "teachpack/teachpack.scrbl")" x-source-pkg="htdp-doc" x-part-tag=""dir"">1.12<tt> </tt><a name="(part._dir)"></a><a name="(mod-path._htdp/dir)"></a>Working with Files and Directories: <span class="stt">"dir.rkt"</span><a name="(idx._(gentag._11._(lib._teachpack/teachpack..scrbl)))"></a></h4><p><table cellspacing="0" cellpadding="0" class="defmodule"><tr><td align="left"><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp-langs&rel=beginner.html%23%2528form._%2528%2528lib._lang%252Fhtdp-beginner..rkt%2529._require%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">require</a></span><span class="stt"> </span><a href="" class="RktModLink" data-pltdoc="x"><span class="RktSym">htdp/dir</span></a><span class="RktPn">)</span></td><td align="right"><span class="RpackageSpec"><span class="Smaller"> package:</span> <span class="stt">htdp-lib</span></span></td></tr></table></p><p>The teachpack provides structures and functions for working with files and
directories:</p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>struct</p></div></div><table cellspacing="0" cellpadding="0" class="RForeground"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=define-struct.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._struct%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">struct</a></span></td><td><span class="hspace"> </span></td><td><a name="(def._((lib._htdp/dir..rkt)._dir-files))"></a><a name="(def._((lib._htdp/dir..rkt)._dir-dirs))"></a><a name="(def._((lib._htdp/dir..rkt)._dir-name))"></a><a name="(def._((lib._htdp/dir..rkt)._make-dir))"></a><a name="(def._((lib._htdp/dir..rkt)._dir~3f))"></a><a name="(def._((lib._htdp/dir..rkt)._struct~3adir))"></a><a name="(def._((lib._htdp/dir..rkt)._dir))"></a><span title="Provided from: htdp/dir | Package: htdp-lib"><span class="RktSym"><span class="RktSymDef RktSym">dir</span></span></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">name</span><span class="stt"> </span><span class="RktSym">dirs</span><span class="stt"> </span><span class="RktSym">files</span><span class="RktPn">)</span></td></tr></table></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">#:extra-constructor-name</span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._make-dir%29%29" class="RktValLink" data-pltdoc="x">make-dir</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym">name</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._or%252Fc%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">or/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=strings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._string%7E3f%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">string?</a></span><span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=symbols.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._symbol%7E3f%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">symbol?</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym">dirs</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._listof%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">listof</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._dir~3f%29%29" class="RktValLink" data-pltdoc="x">dir?</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym">files</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._listof%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">listof</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._file~3f%29%29" class="RktValLink" data-pltdoc="x">file?</a></span><span class="RktPn">)</span></td></tr></table></blockquote></div><div class="SIntrapara">Represents directories (file folders) in the teaching languages.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>struct</p></div></div><table cellspacing="0" cellpadding="0" class="RForeground"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=define-struct.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._struct%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">struct</a></span></td><td><span class="hspace"> </span></td><td><a name="(def._((lib._htdp/dir..rkt)._file-content))"></a><a name="(def._((lib._htdp/dir..rkt)._file-date))"></a><a name="(def._((lib._htdp/dir..rkt)._file-size))"></a><a name="(def._((lib._htdp/dir..rkt)._file-name))"></a><a name="(def._((lib._htdp/dir..rkt)._make-file))"></a><a name="(def._((lib._htdp/dir..rkt)._file~3f))"></a><a name="(def._((lib._htdp/dir..rkt)._struct~3afile))"></a><a name="(def._((lib._htdp/dir..rkt)._file))"></a><span title="Provided from: htdp/dir | Package: htdp-lib"><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=require.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._file%2529%2529&version=6.7" class="RktStxDef Sq RktStxLink" data-pltdoc="x">file</a></span></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">name</span><span class="stt"> </span><span class="RktSym">size</span><span class="stt"> </span><span class="RktSym">date</span><span class="stt"> </span><span class="RktSym">content</span><span class="RktPn">)</span></td></tr></table></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">#:extra-constructor-name</span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._make-file%29%29" class="RktValLink" data-pltdoc="x">make-file</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym">name</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._or%252Fc%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">or/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=strings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._string%7E3f%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">string?</a></span><span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=symbols.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._symbol%7E3f%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">symbol?</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym">size</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._integer%7E3f%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">integer?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym">date</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._or%252Fc%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">or/c</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=time.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._date%7E3f%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">date?</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym">content</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._any%252Fc%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">any/c</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Represents files in the teaching languages. The struct’s <span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=time.html%23%2528def._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._date%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">date</a></span> field is
optional for clients. Calling <span class="RktSym">make-field</span> with three arguments
fills the time field with <span class="RktVal">0</span>.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(def._((lib._htdp/dir..rkt)._create-dir))"></a><span title="Provided from: htdp/dir | Package: htdp-lib"><span class="RktSym"><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._create-dir%29%29" class="RktValDef RktValLink" data-pltdoc="x">create-dir</a></span></span><span class="hspace"> </span><span class="RktVar">path</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._dir~3f%29%29" class="RktValLink" data-pltdoc="x">dir?</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">path</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=strings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._string%7E3f%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">string?</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Turns the directory found at <span class="RktVar">path</span> on your computer into an instance of <span class="RktSym">dir</span>.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>struct</p></div></div><table cellspacing="0" cellpadding="0" class="RForeground"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=define-struct.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._struct%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">struct</a></span></td><td><span class="hspace"> </span></td><td><a name="(def._((lib._htdp/dir..rkt)._date-seconds))"></a><a name="(def._((lib._htdp/dir..rkt)._date-minutes))"></a><a name="(def._((lib._htdp/dir..rkt)._date-hours))"></a><a name="(def._((lib._htdp/dir..rkt)._date-day))"></a><a name="(def._((lib._htdp/dir..rkt)._date-month))"></a><a name="(def._((lib._htdp/dir..rkt)._date-year))"></a><a name="(def._((lib._htdp/dir..rkt)._make-date))"></a><a name="(def._((lib._htdp/dir..rkt)._date~3f))"></a><a name="(def._((lib._htdp/dir..rkt)._struct~3adate))"></a><a name="(def._((lib._htdp/dir..rkt)._date))"></a><span title="Provided from: htdp/dir | Package: htdp-lib"><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=time.html%23%2528def._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._date%2529%2529&version=6.7" class="RktValDef Sq RktValLink" data-pltdoc="x">date</a></span></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">year</span><span class="stt"> </span><span class="RktSym">month</span><span class="stt"> </span><span class="RktSym">day</span><span class="stt"> </span><span class="RktSym">hours</span><span class="stt"> </span><span class="RktSym">minutes</span><span class="stt"> </span><span class="RktSym">seconds</span><span class="RktPn">)</span></td></tr></table></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">#:extra-constructor-name</span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._make-date%29%29" class="RktValLink" data-pltdoc="x">make-date</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym">year</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._natural-number%252Fc%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">natural-number/c</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym">month</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._natural-number%252Fc%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">natural-number/c</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym">day</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._natural-number%252Fc%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">natural-number/c</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym">hours</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._natural-number%252Fc%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">natural-number/c</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym">minutes</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._natural-number%252Fc%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">natural-number/c</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym">seconds</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._natural-number%252Fc%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">natural-number/c</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Represents dates for file construction.</div></p><p><div class="SIntrapara">Sample: Set teachpack to <span class="stt">"dir.rkt"</span> or add <span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=require.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._require%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">require</a></span><span class="stt"> </span><span class="RktSym">htdp/dir</span><span class="RktPn">)</span> to the definitions area. Clicking on Run and asking for the
content of the current directory will produce something like this:
</div><div class="SIntrapara"><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=generic-numbers.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._%7E3e%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">></a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._create-dir%29%29" class="RktValLink" data-pltdoc="x">create-dir</a></span><span class="hspace"> </span><span class="RktVal">"."</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._make-dir%29%29" class="RktValLink" data-pltdoc="x">make-dir</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">"."</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">(</span><span class="RktVal">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._cons%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">cons</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._make-file%29%29" class="RktValLink" data-pltdoc="x">make-file</a></span><span class="hspace"> </span><span class="RktVal">"arrow.scrbl"</span><span class="hspace"> </span><span class="RktVal">1897</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._make-date%29%29" class="RktValLink" data-pltdoc="x">make-date</a></span><span class="hspace"> </span><span class="RktVal">15</span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">15</span><span class="hspace"> </span><span class="RktVal">11</span><span class="hspace"> </span><span class="RktVal">22</span><span class="hspace"> </span><span class="RktVal">21</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">""</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._cons%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">cons</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._make-file%29%29" class="RktValLink" data-pltdoc="x">make-file</a></span><span class="hspace"> </span><span class="RktVal">"convert.scrbl"</span><span class="hspace"> </span><span class="RktVal">2071</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._make-date%29%29" class="RktValLink" data-pltdoc="x">make-date</a></span><span class="hspace"> </span><span class="RktVal">15</span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">15</span><span class="hspace"> </span><span class="RktVal">11</span><span class="hspace"> </span><span class="RktVal">22</span><span class="hspace"> </span><span class="RktVal">21</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">""</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._cons%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">cons</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._make-file%29%29" class="RktValLink" data-pltdoc="x">make-file</a></span><span class="hspace"> </span><span class="RktVal">"dir.scrbl"</span><span class="hspace"> </span><span class="RktVal">1587</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._make-date%29%29" class="RktValLink" data-pltdoc="x">make-date</a></span><span class="hspace"> </span><span class="RktVal">8</span><span class="hspace"> </span><span class="RktVal">7</span><span class="hspace"> </span><span class="RktVal">8</span><span class="hspace"> </span><span class="RktVal">9</span><span class="hspace"> </span><span class="RktVal">23</span><span class="hspace"> </span><span class="RktVal">52</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">""</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._cons%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">cons</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._make-file%29%29" class="RktValLink" data-pltdoc="x">make-file</a></span><span class="hspace"> </span><span class="RktVal">"docs.scrbl"</span><span class="hspace"> </span><span class="RktVal">1259</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._make-date%29%29" class="RktValLink" data-pltdoc="x">make-date</a></span><span class="hspace"> </span><span class="RktVal">15</span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">15</span><span class="hspace"> </span><span class="RktVal">11</span><span class="hspace"> </span><span class="RktVal">22</span><span class="hspace"> </span><span class="RktVal">21</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">""</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._cons%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">cons</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._make-file%29%29" class="RktValLink" data-pltdoc="x">make-file</a></span><span class="hspace"> </span><span class="RktVal">"draw.scrbl"</span><span class="hspace"> </span><span class="RktVal">5220</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._make-date%29%29" class="RktValLink" data-pltdoc="x">make-date</a></span><span class="hspace"> </span><span class="RktVal">15</span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">15</span><span class="hspace"> </span><span class="RktVal">11</span><span class="hspace"> </span><span class="RktVal">22</span><span class="hspace"> </span><span class="RktVal">21</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">""</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._cons%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">cons</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._make-file%29%29" class="RktValLink" data-pltdoc="x">make-file</a></span><span class="hspace"> </span><span class="RktVal">"elevator.scrbl"</span><span class="hspace"> </span><span class="RktVal">1110</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28def._%28%28lib._htdp%2Fdir..rkt%29._make-date%29%29" class="RktValLink" data-pltdoc="x">make-date</a></span><span class="hspace"> </span><span class="RktVal">15</span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">15</span><span class="hspace"> </span><span class="RktVal">11</span><span class="hspace"> </span><span class="RktVal">22</span><span class="hspace"> </span><span class="RktVal">21</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">""</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></blockquote></div><div class="SIntrapara">Using <span class="RktVal">"."</span> usually means the directory in which your program is
located. In this case, the directory contains no sub-directories and six
files.</div></p><p><span style="font-weight: bold">Note</span> The library generates file names as strings, but the
constructors accept symbols for backwards compatibility.</p><p><span style="font-weight: bold">Note</span> Soft links are always treated as if they were empty files.</p><p class="SHistory">Changed in version 1.0 of package <span class="stt">htdp-lib</span>: built in 1996 for HtDP/1e Changed in version 1.4: Fri Jul 8 13:09:13 EDT 2016 added optional date
field to file representation, added strings as representations of file
names</p><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, "6.7", "../");" 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("6.7");">top</a></span><span class="navright"> <a href="docs.html" title="backward to "1.11 Manipulating Simple HTML Documents: "docs.rkt""" data-pltdoc="x">← prev</a> <a href="htdp.html" title="up to "1 HtDP Teachpacks"" data-pltdoc="x">up</a> <a href="graphing.html" title="forward to "1.13 Graphing Functions: "graphing.rkt""" data-pltdoc="x">next →</a></span> </div></div></div><div id="contextindicator"> </div></body></html>
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