appb_10.htm

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<html><head><title>Lists and Arrays (Learning Perl, 3rd Edition)</title><link rel="stylesheet" type="text/css" href="../style/style1.css" /><meta name="DC.Creator" content="Randal L. Schwartz and Tom Phoenix" /><meta name="DC.Format" content="text/xml" scheme="MIME" /><meta name="DC.Language" content="en-US" /><meta name="DC.Publisher" content="O'Reilly &amp; Associates, Inc." /><meta name="DC.Source" scheme="ISBN" content="0596001320L" /><meta name="DC.Subject.Keyword" content="stuff" /><meta name="DC.Title" content="Learning Perl, 3rd Edition" /><meta name="DC.Type" content="Text.Monograph" /></head><body bgcolor="#ffffff"><img alt="Book Home" border="0" src="gifs/smbanner.gif" usemap="#banner-map" /><map name="banner-map"><area shape="rect" coords="1,-2,616,66" href="index.htm" alt="Learning Perl, 3rd Edition" /><area shape="rect" coords="629,-11,726,25" href="jobjects/fsearch.htm" alt="Search this book" /></map><div class="navbar"><table width="684" border="0"><tr><td align="left" valign="top" width="228"><a href="appb_09.htm"><img alt="Previous" border="0" src="../gifs/txtpreva.gif" /></a></td><td align="center" valign="top" width="228"><a href="index.htm"></a></td><td align="right" valign="top" width="228"><a href="appb_11.htm"><img alt="Next" border="0" src="../gifs/txtnexta.gif" /></a></td></tr></table></div><h2 class="sect1">B.10. Lists and Arrays</h2><p><a name="INDEX-1241" /><a name="INDEX-1242" />Perl has a number offeatures that make it easy to manipulate an entire list or array.</p><a name="lperl3-APP-B-SECT-10.1" /><div class="sect2"><h3 class="sect2">B.10.1. map and grep</h3><p>We mentioned (in <a href="ch17_01.htm">Chapter 17, "Some Advanced Perl Techniques"</a>) the<tt class="literal">map</tt><a name="INDEX-1243" /> <a name="INDEX-1244" />and <tt class="literal">grep</tt><a name="INDEX-1245" /> <a name="INDEX-1246" />list-processing operators. They can do more than we could includehere; see the <em class="emphasis">perlfunc</em> manpage for moreinformation and examples.</p></div><a name="lperl3-APP-B-SECT-10.2" /><div class="sect2"><h3 class="sect2">B.10.2. The splice Operator</h3><p>With the <tt class="literal">splice</tt><a name="INDEX-1247" /><a name="INDEX-1248" /> operator, you can add items to the middleof an array, or remove them, letting the array grow or shrink asneeded. (Roughly, this is like what <tt class="literal">substr</tt> letsyou do with strings.) This effectively eliminates the need for linkedlists in Perl. See the<em class="emphasis">perlfunc</em><a name="INDEX-1249" /> manpage.</p></div><hr width="684" align="left" /><div class="navbar"><table width="684" border="0"><tr><td align="left" valign="top" width="228"><a href="appb_09.htm"><img alt="Previous" border="0" src="../gifs/txtpreva.gif" /></a></td><td align="center" valign="top" width="228"><a href="index.htm"><img alt="Home" border="0" src="../gifs/txthome.gif" /></a></td><td align="right" valign="top" width="228"><a href="appb_11.htm"><img alt="Next" border="0" src="../gifs/txtnexta.gif" /></a></td></tr><tr><td align="left" valign="top" width="228">B.9. Mathematics</td><td align="center" valign="top" width="228"><a href="index/index.htm"><img alt="Book Index" border="0" src="../gifs/index.gif" /></a></td><td align="right" valign="top" width="228">B.11. Bits and Pieces</td></tr></table></div><hr width="684" align="left" /><img alt="Library Navigation Links" border="0" src="../gifs/navbar.gif" usemap="#library-map" /><p><p><font size="-1"><a href="copyrght.htm">Copyright &copy; 2002</a> O'Reilly &amp; Associates. All rights reserved.</font></p><map name="library-map"><area shape="rect" coords="1,0,85,94" href="../index.htm"><area shape="rect" coords="86,1,178,103" href="../lwp/index.htm"><area shape="rect" coords="180,0,265,103" href="../lperl/index.htm"><area shape="rect" coords="267,0,353,105" href="../perlnut/index.htm"><area shape="rect" coords="354,1,446,115" href="../prog/index.htm"><area shape="rect" coords="448,0,526,132" href="../tk/index.htm"><area shape="rect" coords="528,1,615,119" href="../cookbook/index.htm"><area shape="rect" coords="617,0,690,135" href="../pxml/index.htm"></map></body></html>

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