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<h5 class="subsubsection">2.7.13.1 Map</h5>

<p>A virtual code application in the following form causes a function with
non-<code>nil</code> virtual code <var>f</var> to be applied to every item
in a list.

     <dl>
<dt><em>T22</em><dd>[[<code>map</code>]] <var>f</var> = <code>((nil,nil),((nil,</code><var>f</var><code>),nil))</code>
</dl>

<p class="noindent"><a name="index-g_t_0040code_007bmap_007d-319"></a>The <code>map</code> mnemonic is used in <code>silly</code> to express applications
in this form as <code>map </code><var>f</var>.  This operation is also well known to
lisp users and functional programmers.  The semantics is determined by
these two operator properties (for non-<code>nil</code> <var>f</var>).

     <dl>
<dt><em>P24</em><dd>([[<code>map</code>]] <var>f</var>) <code>nil</code> = <code>nil</code>
<br><dt><em>P25</em><dd>([[<code>map</code>]] <var>f</var>) <code>(</code><var>x</var><code>,</code><var>y</var><code>)</code> = <code>(</code><var>f</var> <var>x</var><code>,(</code>[[<code>map</code>]] <var>f</var><code>) </code><var>y</var><code>)</code>
</dl>

<p class="noindent">Note that the representation of lists described in
<a href="Representation-of-Numeric-and-Textual-Data.html#Representation-of-Numeric-and-Textual-Data">Representation of Numeric and Textual Data</a>, is assumed.

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