Benchmark: object.keys() vs JSON.stringify()

Script Preparation code:

var xxx = {}

Tests:

Object.keys()
Object.keys(xxx) === 0
Object.keys().length
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()
Object.keys().length
JSON.stringify

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:122.0) Gecko/20100101 Firefox/122.0

Browser/OS: Firefox 122 on Ubuntu

View result in a separate tab

Test name	Executions per second
Object.keys()	24119090.0 Ops/sec
Object.keys().length	42638212.0 Ops/sec
JSON.stringify	7882705.5 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Main Goal:**
The benchmark compares the performance of two JavaScript methods: `Object.keys()` and `JSON.stringify()`. The goal is to determine which method is faster when used on an empty object (`xxx`).

**Comparison Options:**

1. **`Object.keys(xxx) === 0`**: This option checks if the length of the array returned by `Object.keys()` is equal to 0, indicating that the object is empty.
2. **`Object.keys().length === 0`**: This option directly compares the length of the result from `Object.keys()` to 0.
3. **`JSON.stringify(xxx) === "{}"`**: This option checks if the stringified representation of the object using `JSON.stringify()` equals the string `"{"`.

**Pros and Cons:**

* **`Object.keys().length === 0`**: Pros:
	+ More straightforward and less prone to errors.
	+ Directly compares the length of the result, which is a clear indication of the object's emptiness.
Cons:
	+ May not work as expected if `Object.keys()` returns an empty array with objects instead of numbers (not applicable in this case).
* **`JSON.stringify(xxx) === "{}"`**: Pros:
	+ Checks for a specific string value, which can be useful for certain use cases.
Cons:
	+ May not be the most accurate way to check for emptiness, as `JSON.stringify()` can return different representations of an empty object across different browsers and environments.

**Library Usage:**
In this benchmark, no external libraries are used. However, it's worth noting that some browsers may have internal optimizations or quirks when using these methods on objects.

**Special JS Features/Syntax:**
None mentioned in the provided information.

**Other Alternatives:**

For comparing emptiness of an object, you could use other methods such as:

* `Object.keys(xxx).every(key => key === '')` (checks if all keys are empty strings)
* `(xxx.constructor.name === 'Object') && Object.keys(xxx).length === 0` (checks if the constructor is `Object` and the length of the keys array is 0)

Keep in mind that these alternatives might not be as straightforward or widely supported as using `Object.keys().length === 0`.

Related benchmarks:

object.keys() vs JSON.stringify() (version: 0)

Comparing performance of: Object.keys() vs Object.keys().length vs JSON.stringify

Created: 2 years ago by: Registered User

Jump to the latest result

Object.keys()

Object.keys().length

JSON.stringify

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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