How to Empty an Array in JavaScript?

There are a number of ways to empty an array in JavaScript, probably the simplest is to reassign the variable to an empty array:

let array = [1, 2, 3];

// Assigning to an empty array
array = [];

You can also set the length of the array to 0:

// Setting its length property to 0
array.length = 0;

Splice can be also used get rid of everything from an array:

// Using splice with the array's length
array.splice(0, array.length);

So which one to use? The simplest, and also the fastest operation is simply reassigning the variable to an empty array. To see the performance difference, checkout the 3 solutions on JSBen.

50 JavaScript Interview QuestionsAnd their answers explainedHere are 50 JavaScript interview questions that often come up during a technical interview. In one place, one resource to learn from.Learn More

Get access to 300+ webtips 💌

Level up your skills and master the art of frontend development with bite-sized tutorials.

We don't spam. Unsubscribe anytime.

Get Access to Webtips

---

Resources:

• Array splice