JavaScript Array.isArray()

JavascriptWeb DevelopmentFront End TechnologyObject Oriented Programming

The Array.isArray() method of JavaScript is used to determine whether an object is an array or not.

The syntax is as follows −

Array.isArray(ob)

Above, the ob parameter is the object to be tested.

Let us now implement the Array.isArray() method in JavaScript −

Example

 Live Demo

<!DOCTYPE html>
<html>
<body>
   <h2>Ranking Points</h2>
   <p>Is this an array? Click the below button to get the answer...</p>
   <button onclick="display()">Result</button>
   <p id="test"></p>
   <script>
      var pointsArr = [10, 20, 30, 40, 50, 60, 70, 80, 90, 1000];
      var res = pointsArr.entries();
      for (val of res) {
         document.getElementById("test").innerHTML += val + "<br>";
      }
      function display() {
         var res = document.getElementById("test");
         res.innerHTML = Array.isArray(pointsArr);
      }
   </script>
</body>
</html>

Output

Click the “Result” button above −

Example

 Live Demo

<!DOCTYPE html>
<html>
<body>
   <h2>Demo Heading</h2>
   <p>Is this is an array?</p>
   <p id="test"></p>
   <script>
      var arr = ["Accessories", "Electronics", "Books", "Pet Supplies"];
      var res = document.getElementById("test");
      res.innerHTML = Array.isArray(arr);
   </script>
</body>
</html>

Output

raja
Published on 17-Dec-2019 13:07:40
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