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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>evaluate — count</title>
</head>
<body>
  <h1>Loop counter</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var compiled = _.template(
      "<% var i = 0; _.forEach(items, function(item) { i++; %>" +
        "<%- i %>. <%- item %>; " +
      "<% }); %>"
    );
    document.getElementById("out").textContent =
      compiled({ items: ["a", "b", "c"] });
  </script>
</body>
</html>

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Lodash _.templateSettings.evaluate — loop counter (Try It)