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  <title>Lodash _.assignIn — conflicts</title>
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  <h1>_.assignIn — conflict resolution</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var lines = [];
      var target = { a: 1 };
      var source1 = { b: 2 };
      var source2 = { a: 3, c: 4 };
      _.assignIn(target, source1, source2);
      lines.push("target: " + JSON.stringify(target));
      var merged = _.assignIn({}, target, source1, source2);
      lines.push("merged === target ? " + (merged === target));
      lines.push("merged: " + JSON.stringify(merged));
      document.getElementById("out").textContent = lines.join(String.fromCharCode(10));
    })();
  </script>
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Lodash _.assignIn — conflict resolution &amp; mutation (Try It)

Lodash _.assignIn — conflict resolution & mutation (Try It)