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<title>SRFI-1 Selectors (Guile Reference Manual)</title>
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Next: <a href="SRFI_002d1-Length-Append-etc.html" accesskey="n" rel="next">Length, Append, Concatenate, etc.</a>, Previous: <a href="SRFI_002d1-Predicates.html" accesskey="p" rel="prev">Predicates</a>, Up: <a href="SRFI_002d1.html" accesskey="u" rel="up">SRFI-1 - List library</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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<h4 class="subsubsection" id="Selectors"><span>7.5.3.3 Selectors<a class="copiable-link" href="#Selectors"> &para;</a></span></h4>
<a class="index-entry-id" id="index-list-selector"></a>
<dl class="first-deffn">
<dt class="deffn" id="index-first"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">first</strong> <var class="def-var-arguments">pair</var><a class="copiable-link" href="#index-first"> &para;</a></span></dt>
<dt class="deffnx def-cmd-deffn" id="index-second"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">second</strong> <var class="def-var-arguments">pair</var><a class="copiable-link" href="#index-second"> &para;</a></span></dt>
<dt class="deffnx def-cmd-deffn" id="index-third"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">third</strong> <var class="def-var-arguments">pair</var><a class="copiable-link" href="#index-third"> &para;</a></span></dt>
<dt class="deffnx def-cmd-deffn" id="index-fourth"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">fourth</strong> <var class="def-var-arguments">pair</var><a class="copiable-link" href="#index-fourth"> &para;</a></span></dt>
<dt class="deffnx def-cmd-deffn" id="index-fifth"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">fifth</strong> <var class="def-var-arguments">pair</var><a class="copiable-link" href="#index-fifth"> &para;</a></span></dt>
<dt class="deffnx def-cmd-deffn" id="index-sixth"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">sixth</strong> <var class="def-var-arguments">pair</var><a class="copiable-link" href="#index-sixth"> &para;</a></span></dt>
<dt class="deffnx def-cmd-deffn" id="index-seventh"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">seventh</strong> <var class="def-var-arguments">pair</var><a class="copiable-link" href="#index-seventh"> &para;</a></span></dt>
<dt class="deffnx def-cmd-deffn" id="index-eighth"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">eighth</strong> <var class="def-var-arguments">pair</var><a class="copiable-link" href="#index-eighth"> &para;</a></span></dt>
<dt class="deffnx def-cmd-deffn" id="index-ninth"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">ninth</strong> <var class="def-var-arguments">pair</var><a class="copiable-link" href="#index-ninth"> &para;</a></span></dt>
<dt class="deffnx def-cmd-deffn" id="index-tenth"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">tenth</strong> <var class="def-var-arguments">pair</var><a class="copiable-link" href="#index-tenth"> &para;</a></span></dt>
<dd><p>These are synonyms for <code class="code">car</code>, <code class="code">cadr</code>, <code class="code">caddr</code>, &hellip;.
</p></dd></dl>
<dl class="first-deffn">
<dt class="deffn" id="index-car_002bcdr"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">car+cdr</strong> <var class="def-var-arguments">pair</var><a class="copiable-link" href="#index-car_002bcdr"> &para;</a></span></dt>
<dd><p>Return two values, the <small class="sc">CAR</small> and the <small class="sc">CDR</small> of <var class="var">pair</var>.
</p></dd></dl>
<div class="example lisp">
<pre class="lisp-preformatted">(car+cdr '(0 1 2 3))
&rArr;
0
(1 2 3)
</pre></div>
<dl class="first-deffn">
<dt class="deffn" id="index-take"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">take</strong> <var class="def-var-arguments">lst i</var><a class="copiable-link" href="#index-take"> &para;</a></span></dt>
<dt class="deffnx def-cmd-deffn" id="index-take_0021"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">take!</strong> <var class="def-var-arguments">lst i</var><a class="copiable-link" href="#index-take_0021"> &para;</a></span></dt>
<dd><p>Return a list containing the first <var class="var">i</var> elements of <var class="var">lst</var>.
</p>
<p><code class="code">take!</code> may modify the structure of the argument list <var class="var">lst</var>
in order to produce the result.
</p></dd></dl>
<dl class="first-deffn">
<dt class="deffn" id="index-drop"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">drop</strong> <var class="def-var-arguments">lst i</var><a class="copiable-link" href="#index-drop"> &para;</a></span></dt>
<dd><p>Return a list containing all but the first <var class="var">i</var> elements of
<var class="var">lst</var>.
</p></dd></dl>
<dl class="first-deffn">
<dt class="deffn" id="index-take_002dright"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">take-right</strong> <var class="def-var-arguments">lst i</var><a class="copiable-link" href="#index-take_002dright"> &para;</a></span></dt>
<dd><p>Return a list containing the <var class="var">i</var> last elements of <var class="var">lst</var>.
The return shares a common tail with <var class="var">lst</var>.
</p></dd></dl>
<dl class="first-deffn">
<dt class="deffn" id="index-drop_002dright"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">drop-right</strong> <var class="def-var-arguments">lst i</var><a class="copiable-link" href="#index-drop_002dright"> &para;</a></span></dt>
<dt class="deffnx def-cmd-deffn" id="index-drop_002dright_0021"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">drop-right!</strong> <var class="def-var-arguments">lst i</var><a class="copiable-link" href="#index-drop_002dright_0021"> &para;</a></span></dt>
<dd><p>Return a list containing all but the <var class="var">i</var> last elements of
<var class="var">lst</var>.
</p>
<p><code class="code">drop-right</code> always returns a new list, even when <var class="var">i</var> is
zero. <code class="code">drop-right!</code> may modify the structure of the argument
list <var class="var">lst</var> in order to produce the result.
</p></dd></dl>
<dl class="first-deffn">
<dt class="deffn" id="index-split_002dat"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">split-at</strong> <var class="def-var-arguments">lst i</var><a class="copiable-link" href="#index-split_002dat"> &para;</a></span></dt>
<dt class="deffnx def-cmd-deffn" id="index-split_002dat_0021"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">split-at!</strong> <var class="def-var-arguments">lst i</var><a class="copiable-link" href="#index-split_002dat_0021"> &para;</a></span></dt>
<dd><p>Return two values, a list containing the first <var class="var">i</var> elements of the
list <var class="var">lst</var> and a list containing the remaining elements.
</p>
<p><code class="code">split-at!</code> may modify the structure of the argument list
<var class="var">lst</var> in order to produce the result.
</p></dd></dl>
<dl class="first-deffn">
<dt class="deffn" id="index-last"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">last</strong> <var class="def-var-arguments">lst</var><a class="copiable-link" href="#index-last"> &para;</a></span></dt>
<dd><p>Return the last element of the non-empty, finite list <var class="var">lst</var>.
</p></dd></dl>
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