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<head><title>PUT-ASSOC-EQ.html -- ACL2 Version 3.1</title></head>
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<h2>PUT-ASSOC-EQ</h2>modify an association list by associating a value with a key
<pre>Major Section: <a href="PROGRAMMING.html">PROGRAMMING</a>
</pre><p>
<code>(Put-assoc-eq name val alist)</code> returns an alist that is the same
as the list <code>alist</code>, except that the first pair in <code>alist</code> with a
<code><a href="CAR.html">car</a></code> of <code>name</code> is replaced by <code>(cons name val)</code>, if there is
one. If there is no such pair, then <code>(cons name val)</code> is added at
the end. Note that the order of the keys occurring in <code>alist</code> is
unchanged (though a new key may be added).
<p>
The <a href="GUARD.html">guard</a> of <code>(put-assoc-eq name val alist)</code> requires that <code>alist</code>
is an <code><a href="ALISTP.html">alistp</a></code>, and moreover, either <code>name</code> is a symbol or
<code>alist</code> is a <code><a href="SYMBOL-ALISTP.html">symbol-alistp</a></code>.
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