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<a name="Exported-generic-functions"></a>
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Previous: <a href="Exported-functions.html#Exported-functions" accesskey="p" rel="prev">Exported functions</a>, Up: <a href="Exported-definitions.html#Exported-definitions" accesskey="u" rel="up">Exported definitions</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Indexes.html#Indexes" title="Index" rel="index">Index</a>]</p>
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<a name="Generic-functions"></a>
<h4 class="subsection">4.1.3 Generic functions</h4>
<dl>
<dt><a name="index-extract_002dkey"></a>Generic Function: <strong>extract-key</strong> <em>MAP KEY</em></dt>
<dd><a name="go-to-the-DATA_002dLENS_003ccolon_003e_003ccolon_003eEXTRACT_002dKEY-generic-function"></a><a name="index-Generic-Function_002c-extract_002dkey"></a>
<dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens-package.html#go-to-the-DATA_002dLENS-package"><tt>data-lens</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002flens_003cdot_003elisp-file.html#go-to-the-data_002dlens_002flens_003cdot_003elisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
<dt><strong>Methods</strong></dt>
<dd><dl>
<dt><a name="index-extract_002dkey-1"></a>Method: <strong>extract-key</strong> <em>(MAP <tt>hash-table</tt>) KEY</em></dt>
<dd><a name="go-to-the-DATA_002dLENS_003ccolon_003e_003ccolon_003eEXTRACT_002dKEY-COMMON_002dLISP_003ccolon_003e_003ccolon_003eHASH_002dTABLE-COMMON_002dLISP_003ccolon_003e_003ccolon_003eT-method"></a><a name="index-Method_002c-extract_002dkey"></a>
</dd></dl>
<dl>
<dt><a name="index-extract_002dkey-2"></a>Method: <strong>extract-key</strong> <em>(MAP <tt>list</tt>) KEY</em></dt>
<dd><a name="go-to-the-DATA_002dLENS_003ccolon_003e_003ccolon_003eEXTRACT_002dKEY-COMMON_002dLISP_003ccolon_003e_003ccolon_003eLIST-COMMON_002dLISP_003ccolon_003e_003ccolon_003eT-method"></a><a name="index-Method_002c-extract_002dkey-1"></a>
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