Benchmark: Fastest way to check if object is empty - threeway

Script Preparation code:

var xxx = {}

function isEmptyCheck(b) {
  for (const a in b) {
    return false;
  }
  return true;
}

Tests:

object.keys()
Object.keys(xxx) === 0
JSON.stringify()
JSON.stringify(xxx) === "{}"
for...in
for (const a in xxx) { return false; } return true;
function call
isEmptyCheck(xxx);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
object.keys()
JSON.stringify()
for...in
function call

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Measuring the performance of different approaches to check if an object is empty can be a challenging task, as it depends on various factors such as the browser's implementation, version, and platform.

**Benchmark Definition**

The benchmark tests four approaches:

1. `Object.keys(xxx) === 0`
2. `JSON.stringify(xxx) === "{}"`
3. `for (const a in xxx) { return false; } return true;`
4. `isEmptyCheck(xxx);`

Here's what each approach is testing:

* `Object.keys(xxx) === 0`: This test checks if the `length` property of an object (`xxx`) returns 0, which indicates an empty object.
* `JSON.stringify(xxx) === "{}"`: This test checks if the JSON representation of an object (`xxx`) is equal to an empty object (`"{"}`).
* `for (const a in xxx) { return false; } return true;`: This test uses a traditional `for...in` loop to iterate over the properties of an object (`xxx`) and returns `false` if any property is found, indicating an empty object. If no property is found, it returns `true`.
* `isEmptyCheck(xxx);`: This test calls a custom function (`isEmptyCheck`) that takes an object as an argument and returns a boolean value indicating whether the object is empty.

**Library: `JSON`**

The `JSON.stringify()` method is used to convert an object into a JSON string. The `JSON.parse()` method is not explicitly mentioned in this benchmark, but it's worth noting that JSON parsing can also be used to check if an object is empty by trying to parse a malformed JSON string.

**Special JS Feature: None**

There are no special JavaScript features or syntaxes being tested in this benchmark.

**Pros and Cons of Different Approaches**

1. `Object.keys(xxx) === 0`:
	* Pros: Simple, widely supported, and fast.
	* Cons: May not work correctly if the object's properties are not enumerable (e.g., using `Object.getOwnPropertyNames()`).
2. `JSON.stringify(xxx) === "{}"`:
	* Pros: Works for most objects, but may not be as efficient as other methods.
	* Cons: May throw an error if the object is not JSON serializable.
3. `for (const a in xxx) { return false; } return true;`:
	* Pros: Traditional and widely understood approach.
	* Cons: Slow for large objects, may not work correctly if properties are not enumerable.
4. `isEmptyCheck(xxx);`:
	* Pros: Custom function can be optimized for performance.
	* Cons: May require more code to implement and maintain.

**Other Alternatives**

Some alternative approaches that could be considered in a benchmark like this include:

1. Using the `Object.empty()` method (if supported by the browser).
2. Checking the length of an array or an object's properties using `Array.prototype.length` or `Object.keys().length`.
3. Using a library like Lodash to check if an object is empty.

Overall, the choice of approach depends on the specific requirements and constraints of the project.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36

Browser/OS: Chrome 119 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
object.keys()	7080702.0 Ops/sec
JSON.stringify()	3462880.8 Ops/sec
for...in	18656480.0 Ops/sec
function call	9882467.0 Ops/sec

Related benchmarks:

Fastest way to check if object is empty - threeway (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...in vs function call

Created: one year ago by: Guest

Jump to the latest result

object.keys()

JSON.stringify()

for...in

function call

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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