How to empty an array in JavaScript?

There are many ways to empty an array in JavaScript some of them are discussed below:

Method 1: Setting to new Array: This method sets the array variable to new array of size zero, then it will work perfectly.

Example:

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<!DOCTYPE html>  
<html>  
  
<head> 
    <title> 
        JavaScript to set array empty
    </title>
</head> 
           
<body style = "text-align:center;">  
       
    <h1 style = "color:green;" >  
        GeeksForGeeks  
    </h1>  
               
    <p id = "up"></p>
      
    <button onclick="empty()"> 
        Click to Empty
    </button> 
      
    <p id = "down" style="color: green"></p>
      
    <!-- Script to set size of array to zero -->
    <script> 
        var GFG_Array = [1, 2, 3, 4, 5];
        var up = document.getElementById("up");
        up.innerHTML = GFG_Array;
        var down = document.getElementById("down");
        down.innerHTML = "length of GFG_Array = "
                + GFG_Array.length;
        function empty() {
            GFG_Array = [];
            down = document.getElementById("down");
            down.innerHTML = "length of GFG_Array = "
                    + GFG_Array.length;
        }
    </script> 
</body>  
  
</html>

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Output:


    

  • Before clicking the button:
    
Image
    • 

  • After clicking the button:
    
Image
    • 



Method 2: Using length property: This method sets the length of array to zero.


Example:











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<!DOCTYPE html>  


<html>  


  


<head>  


    <title>  


        Create empty array 


    </title> 


</head>  


          


<body style = "text-align:center;">  


  


    <h1 style = "color:green;" >  


        GeeksForGeeks  


    </h1>  


              


    <p id="up"></p> 


      


    <button onclick="empty()">  


        Click to Empty 


    </button>  


      


    <p id="down" style="color: green"></p> 


      


    <!-- Script to set the size of array to zero -->


    <script>  


        var GFG_Array = [1, 2, 3, 4, 5]; 


        var up = document.getElementById("up"); 


        up.innerHTML = GFG_Array; 


        var down = document.getElementById("down"); 


        down.innerHTML = "length of GFG_Array = " 


                + GFG_Array.length; 


                  


        function empty() { 


            GFG_Array.length = 0; 


            down = document.getElementById("down"); 


            down.innerHTML = "length of GFG_Array = " 


                    + GFG_Array.length; 


        } 


    </script>  


</body>  


  


</html>                     



















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Output:


    

  • Before clicking the button:
    
Image
    • 

  • After clicking the button:
    
Image
    • 



Method 3: Using pop method: This method pop the array element continuously and get the empty array. But this method takes more time than others and not much preferred.

Example:











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<!DOCTYPE html>  


<html>  


  


<head>  


    <title>  


        Create empty array 


    </title> 


</head> 


          


<body style = "text-align:center;">  


      


    <h1 style = "color:green;" >  


        GeeksForGeeks  


    </h1>  


              


    <p id="up"></p> 


      


    <button onclick="empty()">  


        Click to Empty 


    </button>  


      


    <p id="down" style="color: green"></p> 


      


    <!-- Script to set the size of array to zero -->    


    <script>  


        var GFG_Array = [1, 2, 3, 4, 5]; 


        var up = document.getElementById("up"); 


        up.innerHTML = GFG_Array; 


        var down = document.getElementById("down"); 


        down.innerHTML = "length of GFG_Array = " 


                + GFG_Array.length; 


                  


        function empty() { 


            while(GFG_Array.length > 0) { 


                GFG_Array.pop(); 


            } 


            down = document.getElementById("down"); 


            down.innerHTML = "length of GFG_Array = " 


                    + GFG_Array.length; 


        } 


    </script>  


</body>  


  


</html>                     



















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Output:


    

  • Before clicking the button:
    
Image
    • 

  • After clicking the button:
    
Image
    • 




          
          
          
          

            

    

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