61 lines
1.9 KiB
HTML
61 lines
1.9 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN">
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<!Originally converted to HTML using LaTeX2HTML 95 (Thu Jan 19 1995) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds >
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<HEAD>
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<TITLE> Funcall</TITLE>
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</HEAD>
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<BODY>
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<meta name="description" value=" Funcall">
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<meta name="keywords" value="lp">
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<meta name="resource-type" value="document">
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<meta name="distribution" value="global">
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<P>
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<BR> <HR>
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<A HREF="node68.html"><IMG ALIGN=BOTTOM ALT="next" SRC="next_motif.gif"></A>
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<A HREF="node64.html"><IMG ALIGN=BOTTOM ALT="up" SRC="up_motif.gif"></A>
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<A HREF="node66.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="previous_motif.gif"></A> <BR>
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<A HREF="lp.html"><B>Contents</B></A>
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<B> Next:</B>
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<A HREF="node68.html"> Apply</A>
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<B>Up:</B>
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<A HREF="node64.html"> FunctionsLambda Expressions, </A>
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<B> Previous:</B>
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<A HREF="node66.html"> Lambda Expressions</A>
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<BR> <HR> <P>
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<H1>Funcall</H1>
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<font size=-1><em>[Our thanks to <a href="mailto:remmers@jremmers.org">John H.
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Remmers</a> for allowing his material from his <a
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href="http://www.emunix.emich.edu/~remmers/337/lisp-functional-features.html">programming
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languages course</a> to be incorporated into this section.]</em></font>
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<p>
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<TT>FUNCALL</TT> is similar to <TT>APPLY</TT>, except that the
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function arguments are at the same level as the function description
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instead of being in a sublist, as <TT>APPLY</TT> is typically used.
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For example:
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<BLOCKQUOTE>
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<TT>
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> (FUNCALL '+ 3 5 9)<br>
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17
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</TT>
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</BLOCKQUOTE>
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In fact, the similarity is closer than this description indicates for
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<BLOCKQUOTE><TT>(FUNCALL '+ 1 2 3)</TT></BLOCKQUOTE>
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not only evaluates to the same result as
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<BLOCKQUOTE><TT>(APPLY '+ '(1 2 3))</TT></BLOCKQUOTE>
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but also to the same result as
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<BLOCKQUOTE><TT>(APPLY '+ 1 2 3 nil)</TT></BLOCKQUOTE>
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<BR> <HR>
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<P>
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<ADDRESS>
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<I>© Colin Allen, John H. Remmers, & Maneesh Dhagat <BR>
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March 2007 </I>
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</ADDRESS>
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</BODY>
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