JavaScript array.keys()

Javascript Web Development Front End Technology Object Oriented Programming

The array.keys() method of JavaScript is used to return an Array Iterator object with the keys of an array.

The syntax is as follows −

array.keys()

Let us now implement the array.keys() method in JavaScript −

Example

Live Demo

<!DOCTYPE html>
<html>
<body>
   <h2>Car Variants</h2>
   <p id="test"></p>
   <script>
      var arrStud = ["Crossover", "Convertible", "Hatchback", "SUV"];
      var res = arrStud.keys();
      for (val of res) {
         document.getElementById("test").innerHTML += val + "<br>";
      }
   </script>
</body>
</html>

Output

Example

Live Demo

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