Benchmark: function vs arrow

Tests:

function
const array = [1, 2, 3, 4, 5]; const filtered = array.filter(function(d) { return d % 2 === 0; });
arrow
const array = [1, 2, 3, 4, 5]; const filtered = array.filter((d) => { return d % 2 === 0; });
arrow-direct
const array = [1, 2, 3, 4, 5]; const filtered = array.filter(d => d % 2 === 0);
arrow-direct2
const array = [1, 2, 3, 4, 5]; const filtered = array.filter((d) => d % 2 === 0);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
function
arrow
arrow-direct
arrow-direct2

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser/OS: Chrome 135 on Linux

View result in a separate tab

arrow

81.8M/s

function

80.2M/s

arrow-direct

79.9M/s

arrow-direct2

79.4M/s

View exact numbers

Test name	Executions per second
✓ arrow	81,839,472 Ops/sec
function	80,183,896 Ops/sec
arrow-direct	79,919,464 Ops/sec
arrow-direct2	79,430,648 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**
The benchmark is comparing three different approaches to filter an array in JavaScript:

1. **Function**: Using a traditional `function` with the `filter()` method, where the callback function takes a single argument (`d`) and returns a boolean value.
2. **Arrow Function (Direct)**: Using an arrow function with the `filter()` method, where the lambda expression `(d) => { ... }` is equivalent to a traditional function definition.
3. **Arrow Function (Indirect)**: This option seems to be missing from the original benchmark, but based on common usage, it would use an arrow function as a callback function inside another function.

**What's being compared?**

The tests are comparing the performance of these three approaches in filtering an array of 5 elements. The `filter()` method is used with different implementation styles: traditional function, arrow function (both direct and indirect).

**Options comparison**

* **Function**: This approach uses a traditional function definition, which can be more verbose but still effective.
	+ Pros:
		- Easy to understand and read
		- Can be easily debugged or optimized
	+ Cons:
		- May be slower due to the overhead of creating a new scope
* **Arrow Function (Direct)**: This approach uses an arrow function with the `filter()` method, which is concise and expressive.
	+ Pros:
		- More concise than traditional functions
		- Can reduce code duplication
	+ Cons:
		- May be less readable for some developers due to the lambda syntax
* **Arrow Function (Indirect)**: This option seems missing from the original benchmark, but it would use an arrow function as a callback function inside another function.

**Library usage**
There is no explicit library used in these tests. However, `filter()` is a built-in method of the Array prototype in JavaScript.

**Special JS feature or syntax**
The test uses arrow functions (both direct and indirect), which is a modern JavaScript feature introduced in ECMAScript 2015. This allows for concise and expressive code by removing the need to declare a separate function scope.

**Other alternatives**

If you were to add additional alternatives, you might consider:

* **Lodash**: A popular utility library that provides a `filter()` method among other functionalities.
* **ES6-ified functions**: Using modern JavaScript features like `map()`, `reduce()`, and `forEach()` to filter arrays in a different way.

Keep in mind that the choice of approach depends on your specific use case, personal preference, and project requirements.

function vs arrow (version: 0) Benchmark.js

Comparing performance of: `function vs arrow vs arrow-direct vs arrow-direct2`

Created: 7 years ago by: Guest

Go to the latest result

function

arrow

arrow-direct

arrow-direct2

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

function vs arrow (version: 0) Benchmark.js

Comparing performance of: function vs arrow vs arrow-direct vs arrow-direct2

Created: 7 years ago by: Guest

Go to the latest result

function

arrow

arrow-direct

arrow-direct2

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

Comparing performance of: `function vs arrow vs arrow-direct vs arrow-direct2`