79 lines
4.7 KiB
HTML
79 lines
4.7 KiB
HTML
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<!-- Common Lisp HyperSpec (TM), version 7.0 generated by Kent M. Pitman on Mon, 11-Apr-2005 2:31am EDT -->
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<HTML>
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<HEAD>
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<TITLE>CLHS: Function PAIRLIS</TITLE>
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<H1><A REV=MADE HREF="http://www.lispworks.com/"><IMG WIDTH=80 HEIGHT=65 ALT="[LISPWORKS]" SRC="../Graphics/LWSmall.gif" ALIGN=Bottom></A><A REL=TOP HREF="../Front/index.htm"><IMG WIDTH=237 HEIGHT=65 ALT="[Common Lisp HyperSpec (TM)]" SRC="../Graphics/CLHS_Sm.gif" ALIGN=Bottom></A> <A REL=PREV HREF="f_cp_ali.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="c_conses.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="f_rassoc.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Next]" SRC="../Graphics/Next.gif" ALIGN=Bottom></A></H1>
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<HR>
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<A NAME="pairlis"><I>Function</I> <B>PAIRLIS</B></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>pairlis</B> <I>keys data <TT>&optional</TT> alist</I> => <I>new-alist</I><P>
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<P>
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<P><B>Arguments and Values:</B><P>
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<P>
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<I>keys</I>---a <A REL=DEFINITION HREF="26_glo_p.htm#proper_list"><I>proper list</I></A>. <P>
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<I>data</I>---a <A REL=DEFINITION HREF="26_glo_p.htm#proper_list"><I>proper list</I></A>. <P>
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<I>alist</I>---an <A REL=DEFINITION HREF="26_glo_a.htm#association_list"><I>association list</I></A>. The default is the <A REL=DEFINITION HREF="26_glo_e.htm#empty_list"><I>empty list</I></A>. <P>
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<I>new-alist</I>---an <A REL=DEFINITION HREF="26_glo_a.htm#association_list"><I>association list</I></A>. <P>
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<P><B>Description:</B><P>
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<P>
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Returns an <A REL=DEFINITION HREF="26_glo_a.htm#association_list"><I>association list</I></A> that associates elements of <I>keys</I> to corresponding elements of <I>data</I>. The consequences are undefined if <I>keys</I> and <I>data</I> are not of the same <A REL=DEFINITION HREF="26_glo_l.htm#length"><I>length</I></A>. <P>
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If <I>alist</I> is supplied, <A REL=DEFINITION HREF="#pairlis"><B>pairlis</B></A> returns a modified <I>alist</I> with the new pairs prepended to it. The new pairs may appear in the resulting <A REL=DEFINITION HREF="26_glo_a.htm#association_list"><I>association list</I></A> in either forward or backward order. The result of <P>
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<PRE>
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(pairlis '(one two) '(1 2) '((three . 3) (four . 19)))
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</PRE>
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</TT> might be <P>
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<PRE>
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((one . 1) (two . 2) (three . 3) (four . 19))
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</PRE>
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</TT> or <P>
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<PRE>
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((two . 2) (one . 1) (three . 3) (four . 19))
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</PRE>
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</TT> <P>
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<P><B>Examples:</B><P>
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<PRE>
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(setq keys '(1 2 3)
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data '("one" "two" "three")
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alist '((4 . "four"))) => ((4 . "four"))
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(pairlis keys data) => ((3 . "three") (2 . "two") (1 . "one"))
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(pairlis keys data alist)
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=> ((3 . "three") (2 . "two") (1 . "one") (4 . "four"))
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alist => ((4 . "four"))
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</PRE>
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</TT> <P>
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<P><B>Side Effects:</B> None.
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<P>
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<P><B>Affected By:</B> None.
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<P>
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<P><B>Exceptional Situations:</B><P>
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<P>
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Should be prepared to signal an error of <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> <A REL=DEFINITION HREF="e_tp_err.htm#type-error"><B>type-error</B></A> if <I>keys</I> and <I>data</I> are not <A REL=DEFINITION HREF="26_glo_p.htm#proper_list"><I>proper lists</I></A>. <P>
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<P><B>See Also:</B><P>
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<P>
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<A REL=DEFINITION HREF="f_acons.htm#acons"><B>acons</B></A> <P>
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<P><B>Notes:</B> None.
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<P>
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<HR>
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<A REL=NAVIGATOR HREF="../Front/StartPts.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Starting Points]" SRC="../Graphics/StartPts.gif" ALIGN=Bottom></A><A REL=TOC HREF="../Front/Contents.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Contents]" SRC="../Graphics/Contents.gif" ALIGN=Bottom></A><A REL=INDEX HREF="../Front/X_Master.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Index]" SRC="../Graphics/Index.gif" ALIGN=Bottom></A><A REL=INDEX HREF="../Front/X_Symbol.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Symbols]" SRC="../Graphics/Symbols.gif" ALIGN=Bottom></A><A REL=GLOSSARY HREF="../Body/26_a.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Glossary]" SRC="../Graphics/Glossary.gif" ALIGN=Bottom></A><A HREF="../Front/X3J13Iss.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Issues]" SRC="../Graphics/Issues.gif" ALIGN=Bottom></A><BR>
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<A REL=COPYRIGHT HREF="../Front/Help.htm#Legal"><I>Copyright 1996-2005, LispWorks Ltd. All rights reserved.</I></A><P>
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