Benchmark: lodash map, foreach, for vs native for, map

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var data = Array(1000000).fill({
    filtering: true,
    mapping: 42
});

Tests:

lodash map
const aux = []; _.map(data, el => {aux.push(el.filtering)});
lodash forEach
const aux = []; _.forEach(data, el => {aux.push(el.filtering)});
native for
const aux = []; for (let index = 0; index < data.length; index++) { const el = data[index]; aux.push(el.filtering) }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash map
lodash forEach
native for

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the provided JSON and explain what is being tested.

**What is being tested?**

MeasureThat.net is testing three different approaches to filter an array of objects:

1. **Lodash `map()`**: A custom implementation using Lodash library, which is a popular JavaScript utility library.
2. **Lodash `forEach()`**: Another custom implementation using Lodash library, but with a different approach than `map()`.
3. **Native `for` loop**: The native JavaScript way of iterating over an array and filtering its elements.

**Options compared**

The three options being tested are:

* Lodash `map()`: uses the `map()` function to create a new array with filtered elements.
* Lodash `forEach()`: uses the `forEach()` function to iterate over the array and push filtered elements into an auxiliary array.
* Native `for` loop: uses a traditional `for` loop to iterate over the array and filter its elements.

**Pros and Cons of each approach**

Here's a brief summary:

1. **Lodash `map()`:**
	* Pros:
		+ Concise and readable code
		+ Optimized for performance by creating a new array with filtered elements
	* Cons:
		+ Requires an additional library (Lodash)
		+ May not be as efficient as native implementations if the array is very large
2. **Lodash `forEach()`:**
	* Pros:
		+ Easy to implement and understand
		+ Can be more flexible than `map()` in certain situations
	* Cons:
		+ Requires an additional library (Lodash)
		+ Pushes elements into an auxiliary array, which can lead to performance issues if the array is large
3. **Native `for` loop:**
	* Pros:
		+ No dependencies on external libraries
		+ Can be more efficient than Lodash implementations for very large arrays
	* Cons:
		+ More verbose code
		+ Requires manual indexing and filtering

**Lodash library**

The `lodash` library is a popular JavaScript utility library that provides various functions for tasks such as array manipulation, string manipulation, and functional programming. The `map()` and `forEach()` functions are two of the most commonly used functions in Lodash.

**Native JavaScript syntax**

There's no special native JavaScript syntax being tested here. However, it's worth noting that the use of a traditional `for` loop for iteration is still a common practice in JavaScript.

**Benchmark result analysis**

The benchmark results show the execution time per second (in seconds) for each test case:

* Lodash `map()`: 24.757ms
* Lodash `forEach()`: 20.685ms
* Native `for` loop: 3.804ms

Based on these results, it appears that the native `for` loop is the fastest approach, followed closely by Lodash `map()`. However, it's essential to consider the trade-offs between performance and code readability and maintainability when choosing an implementation.

Related benchmarks:

lodash map, foreach, for vs native for, map (version: 0)

Comparing performance of: lodash map vs lodash forEach vs native for

Created: 5 years ago by: Guest

Jump to the latest result

lodash map

lodash forEach

native for

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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