Technology Guides and Tutorials

Testing for an Empty JavaScript Object

What is an Empty JavaScript Object?

An empty JavaScript object is an object that has no properties or methods. It is an empty container that can be used to store data. It is also known as an empty object literal.

How to Test for an Empty JavaScript Object

There are several ways to test for an empty JavaScript object. The most common way is to use the Object.keys() method. This method returns an array of the object’s own enumerable properties. If the array is empty, then the object is empty.

For example, let’s say we have an empty object called myObject:

let myObject = {};

We can use the Object.keys() method to test if it is empty:

let keys = Object.keys(myObject);
if (keys.length === 0) {
  console.log('Object is empty');}

Another way to test for an empty object is to use the Object.getOwnPropertyNames() method. This method returns an array of all properties (enumerable or not) of an object. If the array is empty, then the object is empty.

For example, let’s say we have an empty object called myObject:

let myObject = {};

We can use the Object.getOwnPropertyNames() method to test if it is empty:

let properties = Object.getOwnPropertyNames(myObject);
if (properties.length === 0) {
  console.log('Object is empty');}

Summary

Testing for an empty JavaScript object is a simple task that can be accomplished using the Object.keys() or Object.getOwnPropertyNames() methods. Both methods return an array of the object’s own enumerable properties, and if the array is empty, then the object is empty.


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