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How to add an active class to the current element with JavaScript?

Javascript Web Development Object Oriented Programming

To add an active class to the current element with JavaScript, the code is as follows −

Example

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<style>
   .btn {
      border: none;
      outline: none;
      padding: 10px 16px;
      background-color: #6ea2f0;
      cursor: pointer;
      color:white;
      font-size: 18px;
   }
   .active, .btn:hover {
      background-color: #666;
      color: white;
   }
</style>
</head>
<body>
<h1>Active Button Example</h1>
<div id="sampleDiv">
<button class="btn">Giraffe</button>
<button class="btn active">Cow</button>
<button class="btn">Lion</button>
<button class="btn">Leopard</button>
<button class="btn">Cheetah</button>
</div>
<h2>Press any of the above button to set it class to active</h2>
<script>
   var btns = document.querySelectorAll(".btn");
   Array.from(btns).forEach(item => {
      item.addEventListener("click", () => {
         var selected = document.getElementsByClassName("active");
         selected[0].className = selected[0].className.replace(" active", "");
         item.className += " active";
      });
   });
</script>
</body>
</html>