Benchmark: _.map vs. array.map for object

HTML Preparation code:

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.core.js"></script>

Script Preparation code:

var users = {
  'user1': 'joey',
  'user2': 'ross',
  'user3': 'chandler'
}

Tests:

_.map
_.map(users, (name, id) => id + name);
array.map
Object.entries(users).map(([id, name]) => id + name)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.map
array.map

Fastest: N/A

Slowest: N/A

Autogenerated LLM Sumamry (model llama3.2:3b, generated 4 days ago):

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what's being tested.

The test case is comparing two approaches to transform an object into an array of strings using either `lodash` library's `_map` function or JavaScript's built-in `array.map` method.

**What are we testing?**

In this test, we have a JSON object `users` with three properties: `'user1'`, `'user2'`, and `'user3'`. Each property has two values: the user's name and their ID. The goal is to create an array of strings where each string contains the user's ID followed by their name.

We're testing two approaches:

1. Using `lodash` library's `_map` function.
2. Using JavaScript's built-in `array.map` method.

**Options being compared:**

* Option 1: `_map` from Lodash
	+ Pros:
		- Familiar and widely used function for functional programming.
		- Provides a way to handle arrays and objects in a more concise manner.
	+ Cons:
		- Requires loading an additional library (`lodash.js`).
		- May introduce overhead due to the extra dependency.
* Option 2: `array.map`
	+ Pros:
		- Built-in function, no additional dependencies required.
		- Fast and lightweight implementation.
	+ Cons:
		- Can be less readable for complex transformations.
		- Requires understanding of array iteration.

**Library used:**

The `_map` function from the Lodash library is being tested. The library provides a set of functional programming utilities that can simplify code and improve readability.

Lodash's `_.map` function takes two arguments:

* An array or object to iterate over
* A callback function that transforms each element

In this test, we pass the `users` object as the first argument and a callback function that concatenates the user's ID with their name using string interpolation (`id + name`).

**Special JavaScript feature:**

There is no special JavaScript syntax or feature being tested in this benchmark.

**Other alternatives:**

If you prefer not to use Lodash, you can also implement the transformation using JavaScript's built-in `map` method and a callback function. This approach would look like this:

```javascript
Object.entries(users).map(([id, name]) => id + name)
```

Alternatively, you could use other libraries or frameworks that provide similar functionality to Lodash.

**Benchmark preparation code:**

The provided `Script Preparation Code` includes the necessary import statement for Lodash's core library. This ensures that the `_map` function is available when we run the benchmark.

The `Html Preparation Code` is not used in this test case, as it seems to be related to a different benchmark or setup.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 11_2_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.182 Safari/537.36

Browser/OS: Chrome 88 on Mac OS X 11.2.0

View result in a separate tab

Test name	Executions per second
_.map	2294455.0 Ops/sec
array.map	2640952.0 Ops/sec

Related benchmarks:

_.map vs. array.map for object (version: 0)

Comparing performance of: _.map vs array.map

Created: 3 years ago by: Guest

Jump to the latest result

_.map

array.map

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Sumamry (model llama3.2:3b, generated 4 days ago):