Empty an Array in JavaScript

In this tutorial we will see how to Empty an Array in JavaScript. JavaScript length property, array assignment, pop() method and splice() method can be used to remove all elements of array in JavaScript.

JavaScript length property

The JavaScript length property sets or returns the number of elements in the array.

We can use length property to remove all elements of an array.

Take a look at the code given below.

<script>
const lang = ['HTML','CSS','JavaScript','PHP'];
lang.length = 0;
document.write('Array: ' + lang);
</script>

JavaScript Array Assignment

JavaScript Array Assignment is the simplest way to empty an array and remove it's all elements.

In this method we will assign our array to a new array, take a look at the code given below.

<script>
var lang = ['HTML','CSS','JavaScript','PHP'];
lang = [];
document.write('Array: ' + lang);  
</script>

JavaScript pop() Method

The JavaScript pop() method removes the last element of the array.

We can use pop() method to remove all elements of array one by one. For this we will use JavaScript for loop and inside this for loop we will use pop() method.

In this example For loop will run equal to the length of the array and on each iteration last element of the array will be removed. This will remove all elements of array.

<script>
var lang = ['HTML','CSS','JavaScript','PHP'];
var x =lang.length;    
for(a=0;a<x;a++)
{
 lang.pop();
}
document.write(lang);
</script>

We can do same thing with the help of while loop as well, look at the code given below.

<script>
var lang = ['HTML','CSS','JavaScript','PHP'];
var x =lang.length;    
while(x>0)
{
 lang.pop();
}
document.write(lang);  
</script>

JavaScript splice() Method

The JavaScript splice() method removes or replaces the elements of array. It is used to change the array.

We can use the splice() method to empty an array completely.

<script>
var lang = ['HTML','CSS','JavaScript','PHP'];
var x =lang.length;    
lang.splice(0,x);
document.write(lang);  
</script>

In this example 0 is the position from where it should remove elements of array, while x is number of elements to be removed, which is set equal to the length of the array.

Demo

Video Tutorial

Watch our video tutorial on how to Empty an Array in JavaScript.

Change font-size using JavaScript Get Font Size of any Tag using JavaScript Change Position of HTML Element using JavaScript How to Change Image on Hover with JavaScript How to Disable Button by Class Name in JavaScript How To Change Image Size with JavaScript How to change Image opacity with JavaScript How to Change image src on click with JavaScript How to get the lang attribute value in JavaScript How to Get attribute Value using JavaScript How To Check if Attribute Exists or not with JavaScript How To Count number of links on Page with JavaScript How To Scroll Page to Bottom using JavaScript How To Detect Shift Key Press with JavaScript Change Text Color On Hover with JavaScript Hide and Show div using JavaScript Get Button text with JavaScript Get textarea value with JavaScript Get table row Height with JavaScript Auto Increase width of input field with JavaScript Set Textarea maxLength with JavaScript Set Textarea Value with JavaScript JavaScript Count list items JavaScript set input field value Count Button Clicks with JavaScript Scroll Page to the Top on Click with JavaScript