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<span id="Exported-functions"></span><div class="header">
<p>
Next: <a href="Exported-generic-functions.html" accesskey="n" rel="next">Exported generic functions</a>, Previous: <a href="Exported-macros.html" accesskey="p" rel="prev">Exported macros</a>, Up: <a href="Exported-definitions.html" 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" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<span id="Functions"></span><h4 class="subsection">4.1.2 Functions</h4>
<dl>
<dt id="index-_003d_003d">Function: <strong>==</strong> <em>TARGET &key TEST</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236_003d_003d-function"></span><span id="index-Function_002c-_003d_003d"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-applicable_002dwhen">Function: <strong>applicable-when</strong> <em>FUN TEST</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236APPLICABLE_002dWHEN-function"></span><span id="index-Function_002c-applicable_002dwhen"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-catting">Function: <strong>catting</strong> <em>()</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024TRANSDUCERS_2236_2236CATTING-function"></span><span id="index-Function_002c-catting"></span>
<dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002etransducers-package.html#go-to-the-DATA_002dLENS_2024TRANSDUCERS-package"><tt>data-lens.transducers</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002fbeta_002ftransducers_002ftransducers_002elisp-file.html#go-to-the-data_002dlens_002fbeta_002ftransducers_002ftransducers_2024lisp-file"><tt>transducers.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-collecting">Function: <strong>collecting</strong> <em>COLLECTOR</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024TRANSDUCERS_2236_2236COLLECTING-function"></span><span id="index-Function_002c-collecting"></span>
<dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002etransducers-package.html#go-to-the-DATA_002dLENS_2024TRANSDUCERS-package"><tt>data-lens.transducers</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002fbeta_002ftransducers_002ftransducers_002elisp-file.html#go-to-the-data_002dlens_002fbeta_002ftransducers_002ftransducers_2024lisp-file"><tt>transducers.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-combine_002dmatching_002dlists">Function: <strong>combine-matching-lists</strong> <em>&key TEST &allow-other-keys</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236COMBINE_002dMATCHING_002dLISTS-function"></span><span id="index-Function_002c-combine_002dmatching_002dlists"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-compress_002druns">Function: <strong>compress-runs</strong> <em>&key COLLECTOR TEST KEY</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236COMPRESS_002dRUNS-function"></span><span id="index-Function_002c-compress_002druns"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-compressing_002druns">Function: <strong>compressing-runs</strong> <em>&key TEST COMBINER</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024TRANSDUCERS_2236_2236COMPRESSING_002dRUNS-function"></span><span id="index-Function_002c-compressing_002druns"></span>
<dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002etransducers-package.html#go-to-the-DATA_002dLENS_2024TRANSDUCERS-package"><tt>data-lens.transducers</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002fbeta_002ftransducers_002ftransducers_002elisp-file.html#go-to-the-data_002dlens_002fbeta_002ftransducers_002ftransducers_2024lisp-file"><tt>transducers.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-cumsum">Function: <strong>cumsum</strong> <em>&key ADD-FUN KEY COMBINE ZERO</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236CUMSUM-function"></span><span id="index-Function_002c-cumsum"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-deduping">Function: <strong>deduping</strong> <em>&optional TEST</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024TRANSDUCERS_2236_2236DEDUPING-function"></span><span id="index-Function_002c-deduping"></span>
<dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002etransducers-package.html#go-to-the-DATA_002dLENS_2024TRANSDUCERS-package"><tt>data-lens.transducers</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002fbeta_002ftransducers_002ftransducers_002elisp-file.html#go-to-the-data_002dlens_002fbeta_002ftransducers_002ftransducers_2024lisp-file"><tt>transducers.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-denest">Function: <strong>denest</strong> <em>&key RESULT-TYPE</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236DENEST-function"></span><span id="index-Function_002c-denest"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-derive">Function: <strong>derive</strong> <em>DIFF-FUN &key KEY</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236DERIVE-function"></span><span id="index-Function_002c-derive"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-dropping">Function: <strong>dropping</strong> <em>N</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024TRANSDUCERS_2236_2236DROPPING-function"></span><span id="index-Function_002c-dropping"></span>
<dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002etransducers-package.html#go-to-the-DATA_002dLENS_2024TRANSDUCERS-package"><tt>data-lens.transducers</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002fbeta_002ftransducers_002ftransducers_002elisp-file.html#go-to-the-data_002dlens_002fbeta_002ftransducers_002ftransducers_2024lisp-file"><tt>transducers.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-element">Function: <strong>element</strong> <em>NUM</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236ELEMENT-function"></span><span id="index-Function_002c-element"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-exclude">Function: <strong>exclude</strong> <em>PRED</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236EXCLUDE-function"></span><span id="index-Function_002c-exclude"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-exit_002dearly">Function: <strong>exit-early</strong> <em>ACC</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024TRANSDUCERS_2024INTERNALS_2236_2236EXIT_002dEARLY-function"></span><span id="index-Function_002c-exit_002dearly"></span>
<dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002etransducers_002einternals-package.html#go-to-the-DATA_002dLENS_2024TRANSDUCERS_2024INTERNALS-package"><tt>data-lens.transducers.internals</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002fbeta_002ftransducers_002ftransducer_002dprotocol_002elisp-file.html#go-to-the-data_002dlens_002fbeta_002ftransducers_002ftransducer_002dprotocol_2024lisp-file"><tt>transducer-protocol.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-filtering">Function: <strong>filtering</strong> <em>FUNCTION &rest ARGS</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024TRANSDUCERS_2236_2236FILTERING-function"></span><span id="index-Function_002c-filtering"></span>
<dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002etransducers-package.html#go-to-the-DATA_002dLENS_2024TRANSDUCERS-package"><tt>data-lens.transducers</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002fbeta_002ftransducers_002ftransducers_002elisp-file.html#go-to-the-data_002dlens_002fbeta_002ftransducers_002ftransducers_2024lisp-file"><tt>transducers.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-hash_002dtable_002dselect">Function: <strong>hash-table-select</strong> <em>HASH-TABLE</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024TRANSDUCERS_2236_2236HASH_002dTABLE_002dSELECT-function"></span><span id="index-Function_002c-hash_002dtable_002dselect"></span>
<dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002etransducers-package.html#go-to-the-DATA_002dLENS_2024TRANSDUCERS-package"><tt>data-lens.transducers</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002fbeta_002ftransducers_002ftransducers_002elisp-file.html#go-to-the-data_002dlens_002fbeta_002ftransducers_002ftransducers_2024lisp-file"><tt>transducers.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-include">Function: <strong>include</strong> <em>PRED</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236INCLUDE-function"></span><span id="index-Function_002c-include"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-iota">Function: <strong>iota</strong> <em>&key START STEP COUNT</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024TRANSDUCERS_2236_2236IOTA-function"></span><span id="index-Function_002c-iota"></span>
<dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002etransducers-package.html#go-to-the-DATA_002dLENS_2024TRANSDUCERS-package"><tt>data-lens.transducers</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002fbeta_002ftransducers_002flazy_002dsequence_002elisp-file.html#go-to-the-data_002dlens_002fbeta_002ftransducers_002flazy_002dsequence_2024lisp-file"><tt>lazy-sequence.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-juxt">Function: <strong>juxt</strong> <em>FUN1 &rest R</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236JUXT-function"></span><span id="index-Function_002c-juxt"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-key">Function: <strong>key</strong> <em>KEY</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236KEY-function"></span><span id="index-Function_002c-key"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-key_002dtransform">Function: <strong>key-transform</strong> <em>FUN KEY-GET KEY-SET</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236KEY_002dTRANSFORM-function"></span><span id="index-Function_002c-key_002dtransform"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-lazy_002dsequence">Function: <strong>lazy-sequence</strong> <em>NEXT</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024TRANSDUCERS_2236_2236LAZY_002dSEQUENCE-function"></span><span id="index-Function_002c-lazy_002dsequence"></span>
<dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002etransducers-package.html#go-to-the-DATA_002dLENS_2024TRANSDUCERS-package"><tt>data-lens.transducers</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002fbeta_002ftransducers_002flazy_002dsequence_002elisp-file.html#go-to-the-data_002dlens_002fbeta_002ftransducers_002flazy_002dsequence_2024lisp-file"><tt>lazy-sequence.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-make_002dalist_002dlens">Function: <strong>make-alist-lens</strong> <em>KEY</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024LENSES_2236_2236MAKE_002dALIST_002dLENS-function"></span><span id="index-Function_002c-make_002dalist_002dlens"></span>
<p>A lens for updating a alist, discarding previous values
</p><dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002elenses-package.html#go-to-the-DATA_002dLENS_2024LENSES-package"><tt>data-lens.lenses</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002foptics_002elisp-file.html#go-to-the-data_002dlens_002foptics_2024lisp-file"><tt>optics.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-make_002dhash_002dtable_002dlens">Function: <strong>make-hash-table-lens</strong> <em>KEY</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024LENSES_2236_2236MAKE_002dHASH_002dTABLE_002dLENS-function"></span><span id="index-Function_002c-make_002dhash_002dtable_002dlens"></span>
<p>A lens for updating a hash-table, discarding previous values
</p><dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002elenses-package.html#go-to-the-DATA_002dLENS_2024LENSES-package"><tt>data-lens.lenses</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002foptics_002elisp-file.html#go-to-the-data_002dlens_002foptics_2024lisp-file"><tt>optics.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-make_002dlist_002dlens">Function: <strong>make-list-lens</strong> <em>INDEX</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024LENSES_2236_2236MAKE_002dLIST_002dLENS-function"></span><span id="index-Function_002c-make_002dlist_002dlens"></span>
<p>A lens for updating a sequence
</p><dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002elenses-package.html#go-to-the-DATA_002dLENS_2024LENSES-package"><tt>data-lens.lenses</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002foptics_002elisp-file.html#go-to-the-data_002dlens_002foptics_2024lisp-file"><tt>optics.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-make_002dplist_002dlens">Function: <strong>make-plist-lens</strong> <em>KEY</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024LENSES_2236_2236MAKE_002dPLIST_002dLENS-function"></span><span id="index-Function_002c-make_002dplist_002dlens"></span>
<p>A lens for updating a plist, preserving previous values
</p><dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002elenses-package.html#go-to-the-DATA_002dLENS_2024LENSES-package"><tt>data-lens.lenses</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002foptics_002elisp-file.html#go-to-the-data_002dlens_002foptics_2024lisp-file"><tt>optics.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-mapcatting">Function: <strong>mapcatting</strong> <em>FUN</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024TRANSDUCERS_2236_2236MAPCATTING-function"></span><span id="index-Function_002c-mapcatting"></span>
<dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002etransducers-package.html#go-to-the-DATA_002dLENS_2024TRANSDUCERS-package"><tt>data-lens.transducers</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002fbeta_002ftransducers_002ftransducers_002elisp-file.html#go-to-the-data_002dlens_002fbeta_002ftransducers_002ftransducers_2024lisp-file"><tt>transducers.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-mapping">Function: <strong>mapping</strong> <em>FUNCTION &rest ARGS</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024TRANSDUCERS_2236_2236MAPPING-function"></span><span id="index-Function_002c-mapping"></span>
<dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002etransducers-package.html#go-to-the-DATA_002dLENS_2024TRANSDUCERS-package"><tt>data-lens.transducers</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002fbeta_002ftransducers_002ftransducers_002elisp-file.html#go-to-the-data_002dlens_002fbeta_002ftransducers_002ftransducers_2024lisp-file"><tt>transducers.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-maximizing">Function: <strong>maximizing</strong> <em>RELATION MEASURE</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236MAXIMIZING-function"></span><span id="index-Function_002c-maximizing"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-mv_002dfiltering">Function: <strong>mv-filtering</strong> <em>FUNCTION &rest ARGS</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024TRANSDUCERS_2236_2236MV_002dFILTERING-function"></span><span id="index-Function_002c-mv_002dfiltering"></span>
<dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002etransducers-package.html#go-to-the-DATA_002dLENS_2024TRANSDUCERS-package"><tt>data-lens.transducers</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002fbeta_002ftransducers_002ftransducers_002elisp-file.html#go-to-the-data_002dlens_002fbeta_002ftransducers_002ftransducers_2024lisp-file"><tt>transducers.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-mv_002dmapping">Function: <strong>mv-mapping</strong> <em>FUNCTION &rest ARGS</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024TRANSDUCERS_2236_2236MV_002dMAPPING-function"></span><span id="index-Function_002c-mv_002dmapping"></span>
<dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002etransducers-package.html#go-to-the-DATA_002dLENS_2024TRANSDUCERS-package"><tt>data-lens.transducers</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002fbeta_002ftransducers_002ftransducers_002elisp-file.html#go-to-the-data_002dlens_002fbeta_002ftransducers_002ftransducers_2024lisp-file"><tt>transducers.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-mv_002dselecting">Function: <strong>mv-selecting</strong> <em>FUNCTION &rest ARGS</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024TRANSDUCERS_2236_2236MV_002dSELECTING-function"></span><span id="index-Function_002c-mv_002dselecting"></span>
<dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002etransducers-package.html#go-to-the-DATA_002dLENS_2024TRANSDUCERS-package"><tt>data-lens.transducers</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002fbeta_002ftransducers_002ftransducers_002elisp-file.html#go-to-the-data_002dlens_002fbeta_002ftransducers_002ftransducers_2024lisp-file"><tt>transducers.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-of_002dlength">Function: <strong>of-length</strong> <em>LEN</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236OF_002dLENGTH-function"></span><span id="index-Function_002c-of_002dlength"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-of_002dmax_002dlength">Function: <strong>of-max-length</strong> <em>LEN</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236OF_002dMAX_002dLENGTH-function"></span><span id="index-Function_002c-of_002dmax_002dlength"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-of_002dmin_002dlength">Function: <strong>of-min-length</strong> <em>LEN</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236OF_002dMIN_002dLENGTH-function"></span><span id="index-Function_002c-of_002dmin_002dlength"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-on">Function: <strong>on</strong> <em>FUN KEY</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236ON-function"></span><span id="index-Function_002c-on"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-over">Function: <strong>over</strong> <em>FUN &key RESULT-TYPE</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236OVER-function"></span><span id="index-Function_002c-over"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-over-1">Function: <strong>over</strong> <em>LENS CB REC</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024LENSES_2236_2236OVER-function"></span><span id="index-Function_002c-over-1"></span>
<p>Given a lens, a callback and a record, apply the lens to the
record, transform it by the callback and return copy of the record,
updated to contain the result of the callback. This is the fundamental
operation on a lens and SET and VIEW are implemented in terms of it.
</p>
<p>A lens is any function of the form (lambda (fun) (lambda (rec) ...))
that obeys the lens laws (where == is some reasonable equality
operator):<br>
</p>
<p>(== (view lens (set lens value rec))<br>
value)<br>
</p>
<p>(== (set lens (view lens rec) rec)<br>
rec)<br>
</p>
<p>(== (set lens value2 (set lens value1 rec))<br>
(set lens value2 rec))<br>
</p>
<p>The inner lambda returns a functor that determines the policy to be
applied to the focused part. By default, this only uses IDENTITY- and
CONSTANT- in order to implement the lens operations over, set and
view.<br>
</p>
<p>If these conditions are met, (over (data-lens:<>1 lens1 lens2) ...) is
equivalent to using lens2 to focus the part lens1 focuses: note that
composition is "backwards" from what one might expect: this is
because composition composes the wrapper lambdas and applies the
lambda that actually pulls a value out of a record later.
</p><dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002elenses-package.html#go-to-the-DATA_002dLENS_2024LENSES-package"><tt>data-lens.lenses</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002foptics_002elisp-file.html#go-to-the-data_002dlens_002foptics_2024lisp-file"><tt>optics.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-pick">Function: <strong>pick</strong> <em>SELECTOR</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236PICK-function"></span><span id="index-Function_002c-pick"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-regex_002dmatch">Function: <strong>regex-match</strong> <em>REGEX</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236REGEX_002dMATCH-function"></span><span id="index-Function_002c-regex_002dmatch"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-repeating_002a">Function: <strong>repeating*</strong> <em>V &key COUNT</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024TRANSDUCERS_2236_2236REPEATING_002a-function"></span><span id="index-Function_002c-repeating_002a"></span>
<dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002etransducers-package.html#go-to-the-DATA_002dLENS_2024TRANSDUCERS-package"><tt>data-lens.transducers</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002fbeta_002ftransducers_002flazy_002dsequence_002elisp-file.html#go-to-the-data_002dlens_002fbeta_002ftransducers_002flazy_002dsequence_2024lisp-file"><tt>lazy-sequence.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-set">Function: <strong>set</strong> <em>LENS V REC</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024LENSES_2236_2236SET-function"></span><span id="index-Function_002c-set"></span>
<p>Given a lens, a value and a rec, immutably update the rec to
contain the new value at the location focused by the lens.
</p><dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002elenses-package.html#go-to-the-DATA_002dLENS_2024LENSES-package"><tt>data-lens.lenses</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002foptics_002elisp-file.html#go-to-the-data_002dlens_002foptics_2024lisp-file"><tt>optics.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-slice">Function: <strong>slice</strong> <em>START &optional END</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236SLICE-function"></span><span id="index-Function_002c-slice"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-sorted">Function: <strong>sorted</strong> <em>COMPARATOR &rest R &key KEY</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236SORTED-function"></span><span id="index-Function_002c-sorted"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-splice_002delt">Function: <strong>splice-elt</strong> <em>ELT FUN</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236SPLICE_002dELT-function"></span><span id="index-Function_002c-splice_002delt"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-splitting">Function: <strong>splitting</strong> <em>&rest FUNCTIONS</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024TRANSDUCERS_2236_2236SPLITTING-function"></span><span id="index-Function_002c-splitting"></span>
<dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002etransducers-package.html#go-to-the-DATA_002dLENS_2024TRANSDUCERS-package"><tt>data-lens.transducers</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002fbeta_002ftransducers_002ftransducers_002elisp-file.html#go-to-the-data_002dlens_002fbeta_002ftransducers_002ftransducers_2024lisp-file"><tt>transducers.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-suffixp">Function: <strong>suffixp</strong> <em>SUFFIX &key TEST</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236SUFFIXP-function"></span><span id="index-Function_002c-suffixp"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-taking">Function: <strong>taking</strong> <em>N</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024TRANSDUCERS_2236_2236TAKING-function"></span><span id="index-Function_002c-taking"></span>
<dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002etransducers-package.html#go-to-the-DATA_002dLENS_2024TRANSDUCERS-package"><tt>data-lens.transducers</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002fbeta_002ftransducers_002ftransducers_002elisp-file.html#go-to-the-data_002dlens_002fbeta_002ftransducers_002ftransducers_2024lisp-file"><tt>transducers.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-transduce">Function: <strong>transduce</strong> <em>XF BUILD SEQ</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024TRANSDUCERS_2024INTERNALS_2236_2236TRANSDUCE-function"></span><span id="index-Function_002c-transduce"></span>
<dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002etransducers_002einternals-package.html#go-to-the-DATA_002dLENS_2024TRANSDUCERS_2024INTERNALS-package"><tt>data-lens.transducers.internals</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002fbeta_002ftransducers_002ftransducer_002dprotocol_002elisp-file.html#go-to-the-data_002dlens_002fbeta_002ftransducers_002ftransducer_002dprotocol_2024lisp-file"><tt>transducer-protocol.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-transform_002delt">Function: <strong>transform-elt</strong> <em>ELT FUN</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236TRANSFORM_002dELT-function"></span><span id="index-Function_002c-transform_002delt"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-transform_002dhead">Function: <strong>transform-head</strong> <em>FUN</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236TRANSFORM_002dHEAD-function"></span><span id="index-Function_002c-transform_002dhead"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-transform_002dtail">Function: <strong>transform-tail</strong> <em>FUN</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236TRANSFORM_002dTAIL-function"></span><span id="index-Function_002c-transform_002dtail"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-view">Function: <strong>view</strong> <em>LENS REC</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2024LENSES_2236_2236VIEW-function"></span><span id="index-Function_002c-view"></span>
<p>Given a lens and a rec, return the focused value
</p><dl compact="compact">
<dt><strong>Package</strong></dt>
<dd><p><a href="The-data_002dlens_002elenses-package.html#go-to-the-DATA_002dLENS_2024LENSES-package"><tt>data-lens.lenses</tt></a>
</p></dd>
<dt><strong>Source</strong></dt>
<dd><p><a href="The-data_002dlens_002foptics_002elisp-file.html#go-to-the-data_002dlens_002foptics_2024lisp-file"><tt>optics.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
<dl>
<dt id="index-zipping">Function: <strong>zipping</strong> <em>RESULT-TYPE &key FILL-VALUE</em></dt>
<dd><span id="go-to-the-DATA_002dLENS_2236_2236ZIPPING-function"></span><span id="index-Function_002c-zipping"></span>
<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_002elisp-file.html#go-to-the-data_002dlens_002flens_2024lisp-file"><tt>lens.lisp</tt></a> (file)
</p></dd>
</dl>
</dd></dl>
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