How to determine the size of a JavaScript object?

Other Questions JavaScript
1

I’m working with a JavaScript object and I’m curious about the recommended methods or built-in functions to find out how many properties it contains. For example, I have the following object: 

const user = new Object();

user[‘firstName’] = ‘John’;

user[‘lastName’] = ‘Doe’;

user[‘age’] = 30;
What is the best way to achieve this?

2

To find out the number of properties in a JavaScript object, you can use Object.keys(). It returns an array of the object's own property names. Simply get the length of this array to determine the size:

const size = Object.keys(user).length;
console.log(size); // Outputs: 3

This method is efficient and works well in most scenarios. Keep it simple!