Benchmark: Fastest way to check if object is empty using length

Script Preparation code:

var xxx = {}

Tests:

object.keys()
Object.keys(xxx).length === 0
JSON.stringify()
JSON.stringify(xxx) === "{}"

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
object.keys()
JSON.stringify()

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser/OS: Chrome 129 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
object.keys()	10094086.0 Ops/sec
JSON.stringify()	7861430.5 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 2 months ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark is designed to measure which method is the fastest way to check if an object is empty using JavaScript.

**Options Compared**

There are two options compared:

1. `object.keys(xxx).length === 0`
2. `JSON.stringify(xxx) === "{}"`

**Pros and Cons of Each Approach**

1. **Using `object.keys()`**
	* Pros:
		+ This method is concise and easy to read.
		+ It directly checks the length of the object's keys, which implies an empty object has no keys.
	* Cons:
		+ Some older browsers may have issues with this approach due to their internal implementation details.
2. **Using `JSON.stringify()`**
	* Pros:
		+ This method is widely supported across different browsers and versions.
		+ It serializes the entire object, which can be useful for other checks (e.g., checking if an object has a specific property).
	* Cons:
		+ This method can be slower than using `object.keys()` due to the overhead of stringification.

**Library: None**

There are no external libraries used in this benchmark. The tests rely solely on built-in JavaScript methods and properties.

**Special JS Features/Syntax**

None mentioned. Both test cases use standard JavaScript features (objects, keys, stringification).

**Other Alternatives**

If you're interested in exploring alternative approaches, here are a few:

* Using `Object.isEmpty()` or `Object.keys(xxx).length > 0`: These methods are not part of the ECMAScript standard and may not be supported by older browsers. However, they can provide a more explicit way to check for an empty object.
* Using a library like Lodash: If you need additional utility functions for working with objects, Lodash provides `isEmpty()` which is similar to the first alternative mentioned above.

Keep in mind that these alternatives may not be as widely supported or performant as the original benchmark options.

Related benchmarks:

Fastest way to check if object is empty using length (version: 0)

You don't need to make add for loops in your test scenarios, the benchmark does it itself.

Comparing performance of: object.keys() vs JSON.stringify()

Created: 2 months ago by: Guest

Jump to the latest result

object.keys()

JSON.stringify()

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 2 months ago):