How to determine the size of a JavaScript object?

Other Questions JavaScript
1

Hey everyone, I’m working with JavaScript and I’ve got this object:

let person = {
  name: 'Alice',
  job: 'Developer',
  experience: 5
};

I was wondering if there’s a quick way to find out how many properties this object has. Is there some built-in method or a common trick that developers use? I’ve tried looking it up, but I’m not sure what’s the best approach. Any help would be great!

2

I’ve encountered this situation numerous times in my projects. While Object.keys() is commonly used, I’ve found that for comprehensive object size determination, especially in larger applications, using a combination of methods can be beneficial. One approach I’ve adopted is:

const size = Object.keys(person).length + Object.getOwnPropertySymbols(person).length;

This covers both string-keyed and symbol-keyed properties. It’s particularly useful when working with libraries or frameworks that might use symbol properties. Additionally, if you’re dealing with inherited properties, you might want to use a recursive function to traverse the prototype chain. However, for most scenarios, the simple Object.keys() approach suffices. Always consider the specific requirements of your project when choosing a method.

3

In my experience, Object.keys() is indeed a reliable method, but there’s another approach worth considering: Object.getOwnPropertyNames(). This function returns an array of all enumerable and non-enumerable property names of the object. It’s particularly useful when dealing with objects that might have non-enumerable properties. The syntax is straightforward: Object.getOwnPropertyNames(person).length. This method has served me well in various projects, especially when working with more complex objects or those with inherited properties. It’s a bit more comprehensive than Object.keys() in certain scenarios.

4

Yo ethan, u can use Object.keys(person).length to get the count. it’s a quick n easy way to check how many props ur object has. works like a charm for me everytime i need to size up an object. hope that helps mate!