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  <title>Lodash _.defaultsDeep — arrays by index</title>
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  <h1>_.defaultsDeep — arrays by index</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var target = { tags: ["a", "b"] };
      var source = { tags: ["x", "y", "z"] };
      _.defaultsDeep(target, source);
      var target2 = { tags: undefined };
      _.defaultsDeep(target2, source);
      var lines = [];
      lines.push("target:  " + JSON.stringify(target));
      lines.push("target2: " + JSON.stringify(target2));
      document.getElementById("out").textContent =
        lines.join(String.fromCharCode(10));
    })();
  </script>
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Lodash _.defaultsDeep — arrays are recursed by index (Try It)