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:
<!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> |
Output:
- Before clicking the button:
- After clicking the button:
Method 2: Using length property: This method sets the length of array to zero.
Example:
<!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> |
Output:
- Before clicking the button:
- After clicking the button:
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:
<!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> |
Output:
- Before clicking the button:
- After clicking the button:
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