How to add an object to an array in JavaScript ?

There are 3 popular methods which can be used to insert or add an object to an array.

push()
splice()
unshift()

Method 1: push() method of Array

The push() method is used to add one or multiple elements to the end of an array. It returns the new length of the array formed. An object can be inserted by passing the object as a parameter to this method. The object is hence added to the end of the array.

Syntax:

array.push(objectName)

Example:

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>Adding object in array</title> 
    <style> 
        body { 
            text-align: center; 
        } 
    </style> 
</head> 
  
<body> 
    <h1 style="color: green">Geeksforgeeks</h1> 
    <p>Click the button to add new elements to the array.</p> 
  
    <button onclick="pushFunction()">Add elements</button> 
  
    <p id="geeks"></p> 
  
    <script> 
        var list = ["One", "Two", "Three"]; 
        document.getElementById("geeks").innerHTML = list; 
  
        function pushFunction() { 
            list.push("Four", "Five", ); 
            document.getElementById("geeks").innerHTML = list; 
        } 
    </script> 
  
</body> 
  
</html> 

Output:

Before clicking the button:
After clicking the button:

Method 2: splice() method

The splice method is used to both remove and add elements from a specific index. It takes 3 parameters, the starting index, the number of elements to delete and then the items to be added to the array. An object can only be added without deleting any other element by specifying the second parameter to 0.

The object to be inserted is passed to the method and the index where it is to be inserted is specified. This inserts the object at the specified index.

Syntax:

arr.splice(index, 0, objectName)

Example:

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>Adding object in array</title> 
    <style> 
        body { 
            text-align: center; 
        } 
    </style> 
</head> 
  
<body> 
    <h1 style="color: green">Geeksforgeeks</h1> 
    <p>Click the button to add new elements to the array.</p> 
  
    <button onclick="spliceFunction()">Add elements</button> 
  
    <p id="geeks"></p> 
  
    <script> 
        var list = ["HTML", "CSS", "JavaScript"]; 
        document.getElementById("geeks").innerHTML = list; 
  
        function spliceFunction() { 
            list.splice(2,0,"Angular", "SQL", ); 
            document.getElementById("geeks").innerHTML = list; 
        } 
    </script> 
  
</body> 
  
</html>             

Output:

Before clicking the button:
After clicking the button:

Method 3: unshift() method

The unshift() method is used to add one or multiple elements to the beginning of an array. It returns the length of the new array formed. An object can be inserted by passing the object as a parameter to this method. The object is hence added to the beginning of the array.

Syntax:

arr.unshift(object);

Example:

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>Adding object in array</title> 
    <style> 
        body { 
            text-align: center; 
        } 
    </style> 
</head> 
  
<body> 
    <h1 style="color: green">Geeksforgeeks</h1> 
    <p>Click the button to add new elements to the array.</p> 
  
    <button onclick="unshiftFunction()">Add elements</button> 
  
    <p id="geeks"></p> 
  
    <script> 
        var list = ["Geeks", "Contribute", "Explore"]; 
        document.getElementById("geeks").innerHTML = list; 
  
        function unshiftFunction() { 
            list.unshift("for", "Geeks", ); 
            document.getElementById("geeks").innerHTML = list; 
        } 
    </script> 
  
</body> 
  
</html> 

Output:

Before clicking the button:
After clicking the button:

Supported Browser

Google Chrome 1.1 or above
Mozila Firefox 1.1 or above
Safari
Internet Explore 5.5 or above
Opera

My Personal Notes

Oct	NOV	Dec
	13
2018	2019	2020

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