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

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days 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.

Latest run results:

Run details: (Test run date: one month 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

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: one month 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 25 days ago):