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  <title>Lodash concat — values</title>
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  <h1>Lodash _.concat — primitives and arrays</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var merged = _.concat([1], 2, [3]);
      document.getElementById("out").textContent = JSON.stringify(merged, null, 2);
    })();
  </script>
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Lodash _.concat — primitives and arrays (Try It)