119 lines
5.8 KiB
HTML
119 lines
5.8 KiB
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<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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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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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with no
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Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
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copy of the license is included in the section entitled "GNU Free
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Documentation License." -->
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<title>SRFI-1 Constructors (Guile Reference Manual)</title>
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<meta name="description" content="SRFI-1 Constructors (Guile Reference Manual)">
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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="SRFI_002d1.html" rel="up" title="SRFI-1">
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<link href="SRFI_002d1-Predicates.html" rel="next" title="SRFI-1 Predicates">
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<link rel="stylesheet" type="text/css" href="https://www.gnu.org/software/gnulib/manual.css">
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</head>
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<body lang="en">
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<div class="subsubsection-level-extent" id="SRFI_002d1-Constructors">
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<div class="nav-panel">
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<p>
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Next: <a href="SRFI_002d1-Predicates.html" accesskey="n" rel="next">Predicates</a>, Up: <a href="SRFI_002d1.html" accesskey="u" rel="up">SRFI-1 - List library</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="Constructors"><span>7.5.3.1 Constructors<a class="copiable-link" href="#Constructors"> ¶</a></span></h4>
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<a class="index-entry-id" id="index-list-constructor"></a>
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<p>New lists can be constructed by calling one of the following
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procedures.
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</p>
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<dl class="first-deffn">
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<dt class="deffn" id="index-xcons"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">xcons</strong> <var class="def-var-arguments">d a</var><a class="copiable-link" href="#index-xcons"> ¶</a></span></dt>
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<dd><p>Like <code class="code">cons</code>, but with interchanged arguments. Useful mostly when
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passed to higher-order procedures.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-list_002dtabulate"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">list-tabulate</strong> <var class="def-var-arguments">n init-proc</var><a class="copiable-link" href="#index-list_002dtabulate"> ¶</a></span></dt>
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<dd><p>Return an <var class="var">n</var>-element list, where each list element is produced by
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applying the procedure <var class="var">init-proc</var> to the corresponding list
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index. The order in which <var class="var">init-proc</var> is applied to the indices
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is not specified.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-list_002dcopy-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">list-copy</strong> <var class="def-var-arguments">lst</var><a class="copiable-link" href="#index-list_002dcopy-1"> ¶</a></span></dt>
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<dd><p>Return a new list containing the elements of the list <var class="var">lst</var>.
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</p>
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<p>This function differs from the core <code class="code">list-copy</code> (see <a class="pxref" href="List-Constructors.html">List Constructors</a>) in accepting improper lists too. And if <var class="var">lst</var> is
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not a pair at all then it’s treated as the final tail of an improper
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list and simply returned.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-circular_002dlist"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">circular-list</strong> <var class="def-var-arguments">elt1 elt2 …</var><a class="copiable-link" href="#index-circular_002dlist"> ¶</a></span></dt>
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<dd><p>Return a circular list containing the given arguments <var class="var">elt1</var>
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<var class="var">elt2</var> ….
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-iota"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">iota</strong> <var class="def-var-arguments">count [start step]</var><a class="copiable-link" href="#index-iota"> ¶</a></span></dt>
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<dd><p>Return a list containing <var class="var">count</var> numbers, starting from
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<var class="var">start</var> and adding <var class="var">step</var> each time. The default <var class="var">start</var>
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is 0, the default <var class="var">step</var> is 1. For example,
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</p>
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<div class="example">
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<pre class="example-preformatted">(iota 6) ⇒ (0 1 2 3 4 5)
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(iota 4 2.5 -2) ⇒ (2.5 0.5 -1.5 -3.5)
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</pre></div>
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<p>This function takes its name from the corresponding primitive in the
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APL language.
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</p></dd></dl>
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</div>
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<hr>
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<div class="nav-panel">
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<p>
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Next: <a href="SRFI_002d1-Predicates.html">Predicates</a>, Up: <a href="SRFI_002d1.html">SRFI-1 - List library</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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</body>
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</html>
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