Benchmark: Fastest way to check if object is empty

Script Preparation code:

var xxx = {}

Tests:

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

Historical Performance Data aggregated from 101 community runs

Desktop Results:

Chrome 81 runs

object.keys()

10.6M/s

JSON.stringify()

7.8M/s

Fastest: object.keys() (1.4x faster)

View exact numbers

✓ object.keys(): 10,590,141 ops/sec
• JSON.stringify(): 7,834,773 ops/sec

Firefox 20 runs

object.keys()

30.0M/s

JSON.stringify()

7.5M/s

Fastest: object.keys() (4.0x faster)

View exact numbers

✓ object.keys(): 29,971,378 ops/sec
• JSON.stringify(): 7,536,622 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

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: 4 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:148.0) Gecko/20100101 Firefox/148.0

Browser/OS: Firefox 148 on Mac OS X 10.15

View result in a separate tab

object.keys()

46.3M/s

JSON.stringify()

19.0M/s

View exact numbers

Test name	Executions per second
✓ object.keys()	46,327,740 Ops/sec
JSON.stringify()	18,964,842 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases.

**Benchmark Definition:**

The benchmark measures the fastest way to check if an object is empty. This involves comparing two approaches:

1. **Using `Object.keys()`:** The first test case checks if an object is empty by using the `Object.keys()` method, which returns an array of strings representing the property names in the object. If the object is empty, the length of this array should be 0.
2. **Using `JSON.stringify()`:** The second test case checks if an object is empty by converting it to a JSON string using `JSON.stringify()`. An empty object should result in an empty string.

**Pros and Cons:**

* **`Object.keys()`**: This approach has the advantage of being concise and straightforward. It's also generally faster than `JSON.stringify()`, as it only iterates over the object's properties, whereas `JSON.stringify()` needs to serialize the entire object.
	+ However, this approach can be slower for very large objects, as it needs to return an array of property names. Additionally, some implementations might not work correctly if the object has a large number of enumerable properties.
* **`JSON.stringify()`**: This approach has the advantage of being able to handle complex data structures and even nested objects. However, it's generally slower than `Object.keys()`, as it needs to serialize the entire object.
	+ Additionally, this approach can be less readable for simple use cases, as it's not immediately clear what the function is intended to do.

**Library:**

In both test cases, no external libraries are used. However, if we were to implement a more complex data structure or algorithm, we might consider using libraries like Lodash or Underscore.js.

**Special JS Features/Syntax:**

There are no special JavaScript features or syntax mentioned in the benchmark definition. The code is straightforward and follows standard JavaScript conventions.

**Other Alternatives:**

If you wanted to check if an object is empty, other alternatives could include:

* Using `Object.getOwnPropertyNames()` instead of `Object.keys()`
* Using a custom function that checks for property names or values
* Using a more advanced data structure like a Map (if the object has key-value pairs)

Fastest way to check if object is empty (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: 5 years ago by: Guest

Go to the latest result

object.keys()

JSON.stringify()

Historical Performance Data aggregated from 101 community runs

Desktop Results:

Chrome 81 runs

Firefox 20 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Fastest way to check if object is empty (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: 5 years ago by: Guest

Go to the latest result

object.keys()

JSON.stringify()

Historical Performance Data aggregated from 101 community runs

Desktop Results:

Chrome 81 runs

Firefox 20 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

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