Get and set array values

To get and set array values, you use square brackets and provide the zero-based numeric index:

 
<!DOCTYPE html>
<html>
<head>
    <title>Example</title>
    <script type="text/javascript">
        var colors = ["A", "B", "C"]; //define an array of strings 
        document.writeln(colors[0]); //A,display the first item 
        colors[2] = "black";       //change the third item 
        document.writeln(colors[2]); //,display the third item 
        colors[3] = "brown"; //add a fourth item 
        document.writeln(colors[3]); //display the fourth item 
       
    </script>
</head>
<body>
</body>
</html>

Click to view the demo

The following code changes the first element in the array:

 
<!DOCTYPE HTML>
<html>
<head>
<title>Example</title>
</head>
<body>
  <script type="text/javascript">
    var myArray = [ 100, "Adam", true ];
    myArray[0] = "Tuesday";
    document.writeln("Index 0: " + myArray[0]);
  </script>
</body>
</html>

Click to view the demo