Benchmark: _.keys vs object.keys

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.4/lodash.min.js"></script>

Script Preparation code:

var o = {}
for(var i = 0; i < 101; i++) {
	o[i] = new Date()
}

Tests:

_.keys
_.keys(o)
Object.keys
Object.keys(o)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.keys
Object.keys

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser/OS: Chrome 135 on Windows

View result in a separate tab

Test name	Executions per second
_.keys	1558789.2 Ops/sec
Object.keys	1567539.6 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year 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 in question compares the performance of two approaches: using Lodash's `_keys` function versus the built-in `Object.keys()` method.

**Benchmark Definition JSON**

The benchmark definition JSON contains information about the test:

* **Name**: The name of the benchmark, which is "_keys vs object.keys".
* **Description**: An empty description, indicating that no detailed explanation is provided.
* **Script Preparation Code**: A script that creates an array `o` with 101 elements, each containing a new Date object. This script is used to warm up the JavaScript engine before running the benchmark.
* **Html Preparation Code**: A link to include Lodash's JavaScript library in the test environment.

**Individual Test Cases**

The benchmark consists of two individual test cases:

1. **_.keys(o)**: This test case calls the `_keys` function from Lodash on the `o` array, which is created by the script preparation code.
2. **Object.keys(o)**: This test case calls the built-in `Object.keys()` method on the `o` array.

**Options Compared**

The benchmark compares two options:

* **Lodash's `_keys` function**: A utility function provided by Lodash that returns an array of keys from a given object.
* **Built-in `Object.keys()` method**: A native JavaScript method that returns an array of property names in an object.

**Pros and Cons of Each Approach**

Here are the pros and cons of each approach:

* **Lodash's `_keys` function**:
	+ Pros: Efficient and well-optimized, providing a consistent result across browsers.
	+ Cons: Requires including Lodash in the test environment, which may add overhead.
* **Built-in `Object.keys()` method**:
	+ Pros: Built-in to JavaScript, eliminating the need for additional libraries or overhead.
	+ Cons: May not be as efficient or consistent as Lodash's `_keys` function, depending on browser implementation.

**Other Considerations**

When choosing between these two approaches, consider the following factors:

* **Breadth of support**: If you want to ensure compatibility with older browsers or environments that don't support Lodash, using `Object.keys()` might be a safer choice.
* **Performance**: If you prioritize performance and can include Lodash in your test environment, `_keys` function might provide better results.

**Library Used**

Lodash is a popular JavaScript utility library that provides a wide range of functions for tasks such as string manipulation, array manipulation, and more. In this benchmark, the `_keys` function from Lodash is used to extract an array of keys from the `o` object.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntaxes being tested in this benchmark. Both test cases rely on standard JavaScript constructs and built-in methods.

Related benchmarks:

_.keys vs object.keys (version: 1)

Comparing performance of: _.keys vs Object.keys

Created: 8 years ago by: Registered User

Jump to the latest result

_.keys

Object.keys

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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