Benchmark: Array fill method vs for loop_q

Tests:

For Loop fill
let arrayTest = new Array(10); for (let i = 0, l = arrayTest.length; i < l; ++i)arrayTest[i] = true;
Array Fill
let arrayTest = new Array(10).map(a=>true);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
For Loop fill
Array Fill

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the provided benchmark.

**Benchmark Overview**

The benchmark compares two ways to fill an array with a specific value in JavaScript: using a `for` loop and using the `Array.prototype.fill()` method or `Array.from()`. The goal is to measure which approach is faster.

**Options Compared**

Two options are compared:

1. **For Loop**: A traditional `for` loop approach, where an index variable `i` is used to iterate over the array and assign a value (`true`) to each element.
2. **Array Fill/From**: Using either the `Array.prototype.fill()` method or `Array.from()`, which are modern JavaScript methods that can fill an array with a specified value.

**Pros and Cons**

Here's a brief analysis of each approach:

* **For Loop**:
	+ Pros: Simple, straightforward, and well-understood by many developers.
	+ Cons: May not be the most efficient way to fill an array, especially for larger arrays.
* **Array Fill/From**:
	+ Pros: Efficient and scalable for large arrays. Reduces boilerplate code and is often preferred in modern JavaScript development.
	+ Cons: Less intuitive or well-known by some developers.

**Library Usage**

There are no libraries used in this benchmark. The comparison is solely based on the two JavaScript approaches mentioned above.

**Special JS Features/Syntax**

The `let` declaration, arrow functions (`=>`), and template literals (used in the `Array.from()` example) are modern JavaScript features used in the benchmark.

**Other Alternatives**

If you're looking for alternative ways to fill an array, consider:

* **Array.prototype.map()**: Similar to `fill()`, but returns a new array with the specified value applied to each element. (Not used in this benchmark)
* **Closures**: Using closures to create arrays can be another approach. However, this is generally less efficient and less straightforward than using `fill()` or `from()`.
* **Other libraries**: Depending on your use case, you might consider using a library like `lodash` which provides an `array.fill()` method.

**Benchmark Preparation Code**

The provided script preparation code (`let arrayTest = new Array(10);`) is used to create an empty array for the `For Loop` test. The HTML preparation code is not provided, suggesting that the benchmark uses a simple web page without any external dependencies.

In summary, this benchmark measures the performance difference between two ways to fill an array: using a traditional `for` loop and using modern JavaScript methods like `Array.prototype.fill()` or `Array.from()`.

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 11_4_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.90 Safari/537.36

Browser/OS: Chrome 89 on Mac OS X 11.4.0

View result in a separate tab

Test name	Executions per second
For Loop fill	6686690.5 Ops/sec
Array Fill	5593439.5 Ops/sec

Related benchmarks:

Array fill method vs for loop_q (version: 0)

Array fill method vs for loop performance validation

Comparing performance of: For Loop fill vs Array Fill

Created: 3 years ago by: Guest

Jump to the latest result

For Loop fill

Array Fill

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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