Benchmark: _.isEmpty vs Object.keys.length vs getOwnPropertyNames vs isEmpty

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>

Script Preparation code:

window.obj = {};

for (var i = 0, len = 100; i < len; i++) {
  obj['key' + i] = 'value' + i;
}

Tests:

_.isEmpty
_.isEmpty(window.obj);
Object.keys().length
Object.keys(window.obj).length === 0;
getOwnPropertyNames
Object.getOwnPropertyNames(window.obj).length === 0;
isEmpty
function isEmpty(obj) { for (var x in obj) { return false; } return true; } return isEmpty(window.object);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.isEmpty
Object.keys().length
getOwnPropertyNames
isEmpty

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.82 Safari/537.36

Browser/OS: Chrome 98 on Windows

View result in a separate tab

Test name	Executions per second
_.isEmpty	444815.8 Ops/sec
Object.keys().length	482051.7 Ops/sec
getOwnPropertyNames	192234.2 Ops/sec
isEmpty	2681045.5 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The benchmark you provided tests the performance of three different approaches to check if an object is empty: `_.isEmpty`, `Object.keys().length === 0`, and `getOwnPropertyNames`.

**Tested Approaches**

1. **_.isEmpty (Lodash)**: This approach uses the Lodash library, which provides a utility function for checking if an object is empty.
2. **Object.keys().length === 0**: This approach uses the built-in `Object.keys()` method to get an array of the object's own enumerable properties and then checks if its length is zero.
3. **getOwnPropertyNames (JavaScript native)**: This approach uses a JavaScript native function, `getOwnPropertyNames`, which returns an array containing the property names of the object.

**Pros and Cons**

* **_.isEmpty (Lodash)**:
	+ Pros: Easy to use, concise code, and fast performance.
	+ Cons: Requires Lodash library to be included in the test environment.
* **Object.keys().length === 0**:
	+ Pros: Built-in method, no additional dependencies required.
	+ Cons: May have performance overhead due to the array creation and length check.
* **getOwnPropertyNames (JavaScript native)**:
	+ Pros: Fast and lightweight, no additional dependencies required.
	+ Cons: Not as concise or readable as the other two approaches.

**Library and Syntax**

The Lodash library is a popular utility library for JavaScript that provides a wide range of functions for tasks such as string manipulation, array manipulation, and more. In this benchmark, the `_` symbol is used to refer to the `_.isEmpty` function provided by Lodash.

There are no special JS features or syntax used in these benchmarks beyond what's standard in modern JavaScript.

**Alternative Approaches**

Other approaches to checking if an object is empty might include:

* Using a simple loop like the "isEmpty" function in the benchmark.
* Using `Object.entries()` and checking if its length is zero.
* Using a custom implementation of an empty-checking function, such as one that uses `Object.keys()` under the hood.

However, these approaches may have different performance characteristics or trade-offs in terms of code readability and maintainability.

Related benchmarks:

_.isEmpty vs Object.keys.length vs getOwnPropertyNames vs isEmpty (version: 0)

Comparing performance of: _.isEmpty vs Object.keys().length vs getOwnPropertyNames vs isEmpty

Created: 2 years ago by: Guest

Jump to the latest result

_.isEmpty

Object.keys().length

getOwnPropertyNames

isEmpty

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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