89 lines
3.6 KiB
HTML
89 lines
3.6 KiB
HTML
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<!DOCTYPE html>
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<html>
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<!-- Created by GNU Texinfo 7.1, https://www.gnu.org/software/texinfo/ -->
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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>The REPL (Guile Reference Manual)</title>
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<meta name="description" content="The REPL (Guile Reference Manual)">
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<meta name="keywords" content="The REPL (Guile Reference Manual)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content=".texi2any-real">
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<meta name="viewport" content="width=device-width,initial-scale=1">
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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="About-Expressions.html" rel="up" title="About Expressions">
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<link href="Syntax-Summary.html" rel="next" title="Syntax Summary">
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<link href="Tail-Calls.html" rel="prev" title="Tail Calls">
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<style type="text/css">
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<!--
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a.copiable-link {visibility: hidden; text-decoration: none; line-height: 0em}
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div.example {margin-left: 3.2em}
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span:hover a.copiable-link {visibility: visible}
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-->
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</style>
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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="subsection-level-extent" id="The-REPL">
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<div class="nav-panel">
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<p>
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Next: <a href="Syntax-Summary.html" accesskey="n" rel="next">Summary of Common Syntax</a>, Previous: <a href="Tail-Calls.html" accesskey="p" rel="prev">Tail calls</a>, Up: <a href="About-Expressions.html" accesskey="u" rel="up">Expressions and Evaluation</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="subsection" id="Using-the-Guile-REPL"><span>3.3.3 Using the Guile REPL<a class="copiable-link" href="#Using-the-Guile-REPL"> ¶</a></span></h4>
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<p>If you start Guile without specifying a particular program for it to
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execute, Guile enters its standard Read Evaluate Print Loop — or
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<em class="dfn">REPL</em> for short. In this mode, Guile repeatedly reads in the next
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Scheme expression that the user types, evaluates it, and prints the
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resulting value.
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</p>
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<p>The REPL is a useful mechanism for exploring the evaluation behavior
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described in the previous subsection. If you type <code class="code">string-append</code>,
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for example, the REPL replies <code class="code">#<primitive-procedure
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string-append></code>, illustrating the relationship between the variable
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<code class="code">string-append</code> and the procedure value stored in that variable.
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</p>
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<p>In this manual, the notation ⇒ is used to mean “evaluates
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to”. Wherever you see an example of the form
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</p>
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<div class="example lisp">
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<pre class="lisp-preformatted"><var class="var">expression</var>
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⇒
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<var class="var">result</var>
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</pre></div>
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<p>feel free to try it out yourself by typing <var class="var">expression</var> into the
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REPL and checking that it gives the expected <var class="var">result</var>.
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</p>
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</div>
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</body>
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</html>
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