JavaScriptでnull/空のオブジェクトを持つ配列に値を割り当てる方法は？

以下は、JavaScript-

を使用してnull/空のオブジェクトを含む配列に値を割り当てるコードです。

例

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
   body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   }
   .result {
      font-size: 18px;
      font-weight: 500;
      color: rebeccapurple;
   }
</style>
</head>
<body>
<h1>Assign values to an array with null/empty objects</h1>
<div class="result"></div>
<button class="Btn">CLICK HERE</button>
<h3>Click on the above button to assign values to empty object inside arrObj</h3>
<script>
   let resEle = document.querySelector(".result");
   let BtnEle = document.querySelector(".Btn");
   let obj = {
      firstName: "Rohan",
      lastName: "Sharma",
      address: "Delhi",
   };
   let arrObj = [{}, {}, {}];
   BtnEle.addEventListener("click", () => {
      arrObj.forEach((item, index) => {
         item[Object.keys(obj)[index]] = obj[Object.keys(obj)[index]];
      });
      console.log(arrObj);
   });
</script>
</body>
</html>