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  <title>Lodash _.assign — basic merge</title>
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  <h1>_.assign — basic merge</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var defaults = { theme: "light", fontSize: 14, lang: "en" };
      var overrides = { fontSize: 16, lang: "fr" };
      var settings = _.assign({}, defaults, overrides);
      document.getElementById("out").textContent = JSON.stringify(settings, null, 2);
    })();
  </script>
</body>
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Lodash _.assign — layer defaults below overrides (Try It)