How to remove empty elements from an array in JavaScript

In this tutorial, we are going to learn about how to remove empty elements (like strings, null, undefined, etc) from an array in JavaScript.

Consider we have an array like this.

const arr  = ["cat", "rabbit", "", "", 34, 354, null, 3, undefined];

Now we need to remove the empty strings, null and undefined values from the above array.

Using filter() method

In JavaScript, we have the filter() method by using that we can remove empty elements from an array.

The filter() method accepts the callback function as an argument and calls the callback function on each element present in the array.

If the callback function return value is true it keeps the element in array, if the return value is false it removes the element from an array.

Example:

const arr  = ["cat", "rabbit", "", "", 34, 354, null, 3, undefined];

const remove = arr.filter(el=>el)

console.log(remove);

Output:

["cat", "rabbit", 34, 354, 3]