Benchmark: Fastest way to check if object is empty using length 3

Script Preparation code:

var xxx = {}

Tests:

object.keys()
Object.keys(xxx).length === 0
JSON.stringify()
JSON.stringify(xxx) === "{}"
For loop
for (var key in xxx) { return false; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

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

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 JSON and explain what is being tested.

**Benchmark Definition:**

The benchmark definition represents a test scenario that checks for the fastest way to verify if an object is empty using a specific length of 3. The script preparation code initializes an empty object `xxx`. There are three individual test cases:

1. **object.keys()**: This test case checks how many elements are in the `xxx` object by calling its `keys()` method.
2. **JSON.stringify(xxx) === "{}"**: This test case compares the string representation of the `xxx` object using `JSON.stringify()` to an empty string `{}`.
3. **For loop**: This test case uses a traditional for loop to iterate over the `xxx` object and returns false if any key is found.

**Options Compared:**

The benchmark is comparing three different approaches:

1. **object.keys()**: Measures the performance of using the built-in `keys()` method to check the length of an object.
2. **JSON.stringify(xxx) === "{}"**: Compares the string representation of the object to an empty string, which can be considered as checking if the object is empty.
3. **For loop**: Tests a traditional for loop approach to iterate over the object and return false.

**Pros and Cons:**

* **object.keys()**: Pros:
	+ Efficient and built-in method.
	+ Simple to implement.
* Cons:
	+ May not be as accurate if the object has a large number of keys, as the performance may degrade due to the overhead of iterating over all keys.
* **JSON.stringify(xxx) === "{}"**: Pros:
	+ Can be more accurate than `keys()` for larger objects, as it checks the entire string representation.
* Cons:
	+ May introduce additional overhead due to the stringification process.
	+ Less intuitive than using the `length` property directly.
* **For loop**: Pros:
	+ Traditional approach that may be more familiar to developers.
* Cons:
	+ Inefficient and slow compared to other methods.

**Library:**

There is no explicit library mentioned in the benchmark definition. However, some libraries like Lodash or underscore.js might provide similar functionality (e.g., `_.keys()`) but are not used in this specific benchmark.

**Special JS Feature or Syntax:**

None mentioned explicitly, but using `JSON.stringify()` with an empty object `{}` is a common pattern to check if an object is empty. Additionally, the use of a for loop with `var key in xxx` is a traditional approach, but it's not as efficient as other methods.

**Alternatives:**

Other alternatives could include:

1. Using the `length` property directly on the object (`xxx.length === 0`).
2. Checking if the object has any own properties using `Object.keys(xxx).length > 0`.
3. Using a library like Lodash or underscore.js to provide more efficient and concise ways to check for empty objects.

It's worth noting that the benchmark definition is quite simple, and the test cases focus on comparing three specific approaches rather than exploring more advanced techniques or edge cases.

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()	10078492.0 Ops/sec
JSON.stringify()	8089421.5 Ops/sec
For loop	24614934.0 Ops/sec

Related benchmarks:

Fastest way to check if object is empty using length 3 (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() vs For loop

Created: one month ago by: Guest

Jump to the latest result

object.keys()

JSON.stringify()

For loop

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):