100 lines
3.8 KiB
HTML
100 lines
3.8 KiB
HTML
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<!-- This manual documents Guile version 3.0.10.
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Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
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Inc.
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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Permission is granted to copy, distribute and/or modify this document
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any later version published by the Free Software Foundation; with no
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<title>List Syntax (Guile Reference Manual)</title>
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<link href="index.html" rel="start" title="Top">
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<link href="Concept-Index.html" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Lists.html" rel="up" title="Lists">
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<link href="List-Predicates.html" rel="next" title="List Predicates">
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<div class="subsubsection-level-extent" id="List-Syntax">
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<div class="nav-panel">
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<p>
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Next: <a href="List-Predicates.html" accesskey="n" rel="next">List Predicates</a>, Up: <a href="Lists.html" accesskey="u" rel="up">Lists</a> [<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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</div>
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<hr>
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<h4 class="subsubsection" id="List-Read-Syntax"><span>6.6.9.1 List Read Syntax<a class="copiable-link" href="#List-Read-Syntax"> ¶</a></span></h4>
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<p>The syntax for lists is an opening parentheses, then all the elements of
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the list (separated by whitespace) and finally a closing
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parentheses.<a class="footnote" id="DOCF9" href="#FOOT9"><sup>9</sup></a>.
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</p>
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<div class="example lisp">
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<pre class="lisp-preformatted">(1 2 3) ; <span class="r">a list of the numbers 1, 2 and 3</span>
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("foo" bar 3.1415) ; <span class="r">a string, a symbol and a real number</span>
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() ; <span class="r">the empty list</span>
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</pre></div>
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<p>The last example needs a bit more explanation. A list with no elements,
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called the <em class="dfn">empty list</em>, is special in some ways. It is used for
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terminating lists by storing it into the cdr of the last pair that makes
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up a list. An example will clear that up:
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</p>
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<div class="example lisp">
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<pre class="lisp-preformatted">(car '(1))
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⇒
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1
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(cdr '(1))
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⇒
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()
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</pre></div>
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<p>This example also shows that lists have to be quoted when written
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(see <a class="pxref" href="Expression-Syntax.html">Expression Syntax</a>), because they would otherwise be
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mistakenly taken as procedure applications (see <a class="pxref" href="Simple-Invocation.html">Simple Procedure Invocation</a>).
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</p>
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</div>
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<div class="footnotes-segment">
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<hr>
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<h4 class="footnotes-heading">Footnotes</h4>
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<h5 class="footnote-body-heading"><a id="FOOT9" href="#DOCF9">(9)</a></h5>
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<p>Note that there is no separation character between
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the list elements, like a comma or a semicolon.</p>
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</div>
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</body>
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</html>
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