index.html

<!DOCTYPE html>
<html>
  <head>
    <title>Mappings</title>
    <link href="/admin.css" rel="stylesheet">
    <link href="/list.css" rel="stylesheet">
    <link href="/favicon.png" rel="icon" sizes="192x192" type="image/png">
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <script type="text/x-mathjax-config">
     MathJax.Hub.Config({
       tex2jax: {inlineMath: [['$','$'], ['\\(','\\)']]}
     });
    </script>
    <script crossorigin="anonymous" integrity=
            "sha384-Ra6zh6uYMmH5ydwCqqMoykyf1T/+ZcnOQfFPhDrp2kI4OIxadnhsvvA2vv9A7xYv" src=
            "https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML"
            type="text/javascript"></script>
  </head>

  <body>
    <h1>SRFI 146: Mappings</h1>
    <p class="authors">by Arthur A. Gleckler and Marc Nieper-Wißkirchen</p>
    <p class="based-on"></p>
    <p class="status">status: <em>final</em> (2018-05-24)</p>
    <p class="keywords">keywords: <a href="https://srfi.schemers.org/?keywords=data-structure">Data Structure</a>, <a href="https://srfi.schemers.org/?keywords=r7rs-large">R7RS Large</a>, <a href="https://srfi.schemers.org/?keywords=r7rs-large-tangerine">R7RS Large: Tangerine Edition</a></p><span class="see-also">See also <a href="/srfi-224/">SRFI 224: Integer Mappings</a>.</span>

    <ul class="info">
      <li><a href="srfi-146.html">The SRFI Document</a></li>
      <li><a href="https://srfi-email.schemers.org/srfi-146/">Discussion Archive</a></li>
      <li><a href="https://github.com/scheme-requests-for-implementation/srfi-146">Git repo (on Github)</a></li>
      <li>
        <a href="mailto:srfi-146@srfi.schemers.org">srfi-146@<span class="antispam">nospam</span>srfi.schemers.org (subscribers only)</a></li>
      <li>
        <span class="firefox-column-workaround">
          <form method="POST" action="https://www.simplelists.com/subscribe.php">
            <div class="title">Subscribe to srfi-146 mailing list</div>
            <input name="email"
                   placeholder="email address"
                   tabindex="1"
                   type="email" >
            <input name="name"
                   placeholder="full name"
                   tabindex="2"
                   type="text" >
            <p>
              <input id="sub-digest"
                     name="digest"
                     tabindex="3"
                     type="checkbox"
                     value="digest" >
              <label for="sub-digest">daily digest?</label></p>
            <input class="submit"
                   name="submit"
                   tabindex="4"
                   type="submit"
                   value="Subscribe to srfi-146" >
            <input type="hidden" name="action" value="subscribe">
            <input type="hidden" name="list" value="srfi-146@srfi.schemers.org"></form></a></li>
      <li>
        <span class="firefox-column-workaround">
          <form method="POST" action="https://www.simplelists.com/subscribe.php">
            <p class="title">Unsubscribe from srfi-146 mailing list</p>
            <input name="email"
                   placeholder="email address"
                   tabindex="5"
                   type="email" >
            <input class="submit"
                   name="submit"
                   tabindex="6"
                   type="submit"
                   value="Unsubscribe from srfi-146" >
            <input name="action"
                   type="hidden"
                   value="unsubscribe" >
            <input name="list"
                   type="hidden"
                   value="srfi-146@srfi.schemers.org"></form></a></li></ul>
    <h2>Abstract</h2>      <p><em>Mappings</em> are finite sets of
      associations, where each association is a pair consisting of a key and an
      arbitrary Scheme value. The keys are elements of a suitable domain. Each
      mapping holds no more than one association with the same key. The
      fundamental mapping operation is retrieving the value of an association
      stored in the mapping when the key is given.</body></html>