Benchmark: lodash.map() vs Object.keys().map()

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/lodash/4.16.0/lodash.min.js"></script>

Script Preparation code:

var value = {};
for (let i = 0; i < 1000; i++) {
  value['key_' + i] = Math.random() * 100;
}

Tests:

lodash.map()
_.map(value, (v) => v)
Object.keys().map()
Object.keys(value).map((v) => v)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash.map()
Object.keys().map()

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

I'll break down the benchmark and its components, explaining what's being tested, compared, and their pros and cons.

**Benchmark Definition**

The benchmark is designed to compare two approaches for mapping over an object in JavaScript: `lodash.map()` and `Object.keys().map()`.

**Script Preparation Code**

The script preparation code creates a large object `value` with 1000 properties, each assigned a random value between 0 and 100. This object will be used as the input for the benchmarking tests.

**Html Preparation Code**

The HTML preparation code includes a link to the Lodash library (version 4.16.0) via a CDN, which allows the browser to load and execute the `lodash` namespace in the test environment.

**Individual Test Cases**

There are two individual test cases:

1. `_.map(value, (v) => v)`: This test case uses the Lodash `map()` function with an arrow function as the callback.
2. `Object.keys(value).map((v) => v)`: This test case uses the built-in `Object.keys()` method to get an array of property names and then maps over it using the same arrow function.

**Comparison**

The benchmark is designed to measure the performance difference between these two approaches:

* **Lodash `map()`**: The Lodash library provides a optimized implementation of the `map()` function, which may be faster than the built-in approach.
* **Built-in `Object.keys().map()`**: This approach uses the `Object.keys()` method to get an array of property names and then maps over it. While this is a standard JavaScript feature, it might not be as optimized as Lodash's implementation.

**Pros and Cons**

Here are some pros and cons for each approach:

* **Lodash `map()`**:
	+ Pros: Optimized implementation, may be faster.
	+ Cons: Additional library dependency, may introduce overhead due to module loading.
* **Built-in `Object.keys().map()`**:
	+ Pros: No additional library dependency, standard JavaScript feature.
	+ Cons: May not be as optimized, can be slower than Lodash's implementation.

**Library: Lodash**

Lodash is a popular utility library for JavaScript that provides a wide range of functions and methods for tasks like array manipulation, object manipulation, and more. The `map()` function is one of the most commonly used functions in Lodash, and it's optimized for performance.

**Special JS Feature or Syntax: None**

There are no special JavaScript features or syntax mentioned in this benchmark that would require additional explanation.

**Other Alternatives**

If you want to compare other approaches, here are some alternatives:

* Use a different library like `lodash-es` (a smaller and more modern version of Lodash) or another utility library.
* Compare the performance of using `Array.prototype.map()` instead of `Object.keys().map()`.
* Use a testing framework like Jest or Mocha to write and run more complex benchmarks.

Note that the choice of approach ultimately depends on the specific requirements and constraints of your project.

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:105.0) Gecko/20100101 Firefox/105.0

Browser/OS: Firefox 105 on Windows

View result in a separate tab

Test name	Executions per second
lodash.map()	9887.3 Ops/sec
Object.keys().map()	22386.9 Ops/sec

Related benchmarks:

lodash.map() vs Object.keys().map() (version: 0)

lodash.map() vs Object.keys().map()

Comparing performance of: lodash.map() vs Object.keys().map()

Created: 2 years ago by: Guest

Jump to the latest result

lodash.map()

Object.keys().map()

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):