Benchmark: compare array mapping

HTML Preparation code:

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

Script Preparation code:

var itemsArray = [];

for (let i = 0; i < 100000; i++) {
	itemsArray.push({
    	id: i,
      	author: 'Robert' + i,
    })
}

Tests:

native map
console.log(itemsArray.map(item => item.id)) console.log(itemsArray.map(item => item.author))
lodash map
console.log(_.map(itemsArray, item => item.id)) console.log(_.map(itemsArray, item => item.author))
native forEach push
let a = []; let b = []; itemsArray.forEach(item => { a.push(item.id); b.push(item.author)}) console.log(a) console.log(b)
lodash forEach push
let a = []; let b = []; _.forEach(itemsArray, item => { a.push(item.id); b.push(item.author)}) console.log(a) console.log(b)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
native map
lodash map
native forEach push
lodash forEach push

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmarking scenario.

**Benchmark Definition JSON**

The provided JSON defines a benchmark that compares three approaches to map an array of objects in JavaScript:

1. **Native `map()`**: Uses the built-in `map()` method on the `itemsArray` variable to create two new arrays, one for each property (`id` and `author`) of the object.
2. **Lodash `.map()`**: Uses the `_` (Lodash) library's `map()` function to achieve the same result as the native `map()` method.
3. **Native `forEach()` with push**: Uses a traditional `forEach()` loop on the `itemsArray` variable to iterate over each element and push the desired property values into two separate arrays.

**Options Compared**

The benchmark compares two native JavaScript approaches (`native map` and `native forEach push`) against their Lodash counterparts (`lodash map` and `lodash forEach push`). The goal is to evaluate which approach performs better in terms of speed and execution frequency per second.

**Pros and Cons of Each Approach:**

1. **Native `map()`**:
	* Pros: Built-in, efficient, and well-maintained.
	* Cons: May not be as flexible or customizable as other approaches.
2. **Lodash `.map()`**:
	* Pros: More flexible and customizable than native `map()`, with additional utility functions available in Lodash.
	* Cons: Introduces an external dependency (Lodash) and may incur a small overhead due to the function call.
3. **Native `forEach()` with push**:
	* Pros: Can be more flexible and customizable than `map()`, as it allows for arbitrary iteration logic.
	* Cons: May be slower and less efficient than `map()` due to the additional overhead of using `forEach()`.

**Lodash Library**

The Lodash library is a popular JavaScript utility library that provides a wide range of functional programming helpers, including `map()`. It's designed to make common tasks easier and more expressive, but it also introduces an external dependency.

**Special JS Feature/Syntax: None**

None of the provided benchmarking code uses any special or advanced JavaScript features/syntax.

**Other Alternatives**

If you were looking for alternative approaches to map arrays in JavaScript, some other options might include:

* Using `filter()` followed by `map()`
* Using `reduce()` with an accumulator function
* Utilizing modern array methods like `flatMap()` (introduced in ECMAScript 2019)

However, the provided benchmarking scenario focuses on comparing native JavaScript approaches (`map()` and `forEach()`) against their Lodash counterparts, making it a good starting point for evaluating the performance trade-offs of these different methods.

Related benchmarks:

compare array mapping (version: 0)

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

Created: 5 years ago by: Guest

Jump to the latest result

native map

lodash map

native forEach push

lodash forEach push

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):