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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Lodash countBy — bins</title>
</head>
<body>
  <h1>Lodash _.countBy — numeric bins</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      document.getElementById("out").textContent = JSON.stringify(
        _.countBy([83, 87, 91, 44, 49], function (n) {
          return Math.floor(n / 10) * 10;
        })
      );
    })();
  </script>
</body>
</html>

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Lodash _.countBy — bins (Try It)