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How to view array of a structure in JavaScript ?
  • Last Updated : 23 Oct, 2019

The Javascript arrays are heterogeneous. The structure of the array is the same which is enclosed between two square brackets [ ], and string should be enclosed between either “double quotes” or ‘single quotes’. You can get the structure of by using JSON.stringify() or not, here you will see the use of JSON.stringify(). For other procedure you can check this link.

Syntax:

JSON.stringify(value, replacer, space)

The Functionality of the alert() is to first give information to the user before gets proceeding further. So, in the below code, the button on click function(Alert()) has two alerts (alert()), after displaying all the alerts it gets further with the webpage. By clicking ‘ok’ in the alert box it displays the next alert until all are done.

Let’s check the type of alerts can be applied:

  • alert(JSON.stringify(guardians)): It displays as it is array structure.
  • alert(JSON.stringify(guardians, 9, 1)): It displays the customized structure, where the 9 acts a replacer, makes array elements gets print in vertically and 1 acts as space number and provides one space between elements.
  • alert(JSON.stringify(guardians, “”, 5)): It displays, the customized structure, where the “” acts a replacer, makes array elements gets print in vertically and 5 acts as space number and provides five space between elements.

Example 1:






<!DOCTYPE html>
<html>
  
<head>
    <title>
        How to view array of a
        structure in JavaScript?
    </title>
</head>
  
<body style="text-align:center;">
  
    <h1 style="color:Green;">
        GeeksforGeeks
    </h1>
      
    <h3>
        Geeting array structure JSON.stringfy
    </h3>
  
    <p id="d1"></p>
  
    <input type="button" onclick="Alert()"
                value="Click Here" />
  
    <script>
        function Alert() {
              
            // Array structure
            var guardians = ["Quill", "Gamora",
                    "Groot", "Rocket", "Drax", 21];
              
            // Prints the array elements with a comma
            // separated but not the structure 
            document.getElementById("d1").innerHTML
                    = "Guardians = " + guardians;
              
            // Alerts the window with the array
            alert(JSON.stringify(guardians))
              
            // Alerts the window with a customized array
            alert(JSON.stringify(guardians, 9, 1))
        }
    </script>
</body>
  
</html>

Output:

  • Before clicking button:
  • After clicking button:
  • After clicking ok:
  • Final printed result:

Example 2: You can also get the structure of an Associate array easily.




<!DOCTYPE html>
<html>
  
<head>
    <title>
        How to view array of a
        structure in JavaScript?
    </title>
</head>
  
<body style="text-align:center;">
      
    <h1 style="color:Green;">
        GeeksforGeeks
    </h1>
      
    <h3>
        Geeting associate array
        structure JSON.stringfy
    </h3>
  
    <p id="d1"></p>
  
    <input type="button" onclick="Alert()"
                value="Click Here" />
  
    <script>
        function Alert() {
          
            // Array structure
            var guardians = { 
                "Newton": "Gravity", 
                "Albert": "Energy", 
                "Edison": "Bulb", 
                "Tesla": "AC"
            };
              
            // Alerts the window with the array
            alert(JSON.stringify(guardians))
              
            // Alerts the window with a
            // customized array
            alert(JSON.stringify(guardians, 9, 1))
              
            // Alerts the window with a
            // customized array
            alert(JSON.stringify(guardians,"",5))
        }
    </script>
</body>
  
</html>           

Output:

  • Before clicking button:
  • After clicking button:
  • After clicking ok:
  • After clicking 2nd ok:

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