Benchmark: Array fill method vs for loop__

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).fill(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

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser/OS: Chrome 135 on Windows

View result in a separate tab

Test name	Executions per second
For Loop fill	78917264.0 Ops/sec
Array Fill	15882080.0 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 JSON and explain what's being tested, compared, and the pros/cons of each approach.

**Benchmark Definition**

The benchmark is designed to compare two methods for filling an array with a specific value: using a `for` loop and using the `Array.fill()` method.

**Options Compared**

1. **For Loop fill**: This option uses a traditional `for` loop to iterate over the array length, assigning a value (`true`) to each element.
2. **Array Fill**: This option utilizes the `Array.fill()` method, which sets all elements of an array to a specified value (in this case, `true`) in a single operation.

**Pros and Cons**

* **For Loop fill**:
	+ Pros: Simple, easy to understand, and can be useful for educational purposes or when working with smaller arrays.
	+ Cons: Can be slower than the `Array.fill()` method, especially for larger arrays, due to the overhead of incrementing a loop counter and assigning values individually.
* **Array Fill**:
	+ Pros: Faster and more efficient for large arrays, as it leverages the browser's optimized implementation of the `fill()` method.
	+ Cons: May not be suitable for smaller arrays or educational purposes, as it can obscure understanding of traditional looping constructs.

**Library**

The `Array.fill()` method is a built-in JavaScript library function that fills an array with a specified value. Its purpose is to provide a concise and efficient way to set all elements of an array to a single value.

**Special JS Feature/Syntax**

There isn't any specific special feature or syntax mentioned in the provided benchmark definition. However, it's worth noting that the use of `let` and `const` declarations for variable assignment is a relatively recent JavaScript feature introduced in ECMAScript 2015 (ES6). The benchmark doesn't explicitly use these features, but they are commonly used in modern JavaScript code.

**Other Alternatives**

If you're looking for alternative approaches to filling an array, consider the following:

* Using `Array.prototype.forEach()` and setting a callback function with a return value to `true`.
* Utilizing a `for...of` loop or `while` loop with incrementing indices.
* Leveraging libraries like Lodash or Ramda, which provide utility functions for working with arrays.

Keep in mind that the performance differences between these approaches may be negligible unless dealing with very large arrays.

Related benchmarks:

Array fill method vs for loop__ (version: 0)

Array fill method vs for loop performance validation

Comparing performance of: For Loop fill vs Array Fill

Created: 4 years ago by: Guest

Jump to the latest result

For Loop fill

Array Fill

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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