JavaScript Array.isArray()

Javascript Web Development Front End Technology Object 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>