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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>thru — conditional</title>
</head>
<body>
  <h1>Conditional thru()</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    function wrapOdds(n) {
      return n % 2 ? { odd: n } : { even: n };
    }
    document.getElementById("out").textContent = JSON.stringify(
      _([1, 2, 3])
        .chain()
        .map(wrapOdds)
        .thru(function (list) {
          return list.filter(function (item) { return item.odd; });
        })
        .value()
    );
  </script>
</body>
</html>

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Lodash _.thru() — conditional (Try It)