JavaScript - How to clear an Array

In this tutorial, we are going to learn three different approaches to clear the array in JavaScript with the help of examples.

First way

To clear an array in JavaScript, we need to a reassign a variable to the empty array.

Here is an example:

var arr = [1,2,3,4,5,6];

arr = [ ];
console.log(arr);

Output:

 [ ]

In the above example, we have cleared the array by assigning a new empty array [].

Second way

Similarly, we can also clear the array by setting it’s array.length property to 0.

Here is an example:

var arr = [1,2,3,4,5,6];

arr.length = 0;
console.log(arr);

//empty array [ ]

In the above code, we updated the length of the array to 0. so that it becomes empty and it takes more time compared to the first way.

Third way

var arr = [1,2,3,4,5,6];

while(arr.length){
   arr.pop();
}

console.log(arr);
//--> [ ]

Here, we are using the Array.prototype.pop() inside the while loop to remove every element present in the array.

Performance test shows that, the first way is the fastest way to clear the array if you are interested to see the performance test then check out clear arrays performance.

Happy coding…