Benchmark: array creation comparison 2

Tests:

fill
const miArray1 = Array(100).fill().map((el, i)=> i)
spread
const miArray1 = Array(100).fill().map((el, i)=> i)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
fill
spread

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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I'll break down the explanation into smaller sections to make it easier to understand.

**Benchmark Definition JSON**

The provided JSON represents a benchmark definition for measuring the performance of JavaScript array creation methods. The key points from this JSON are:

* `Name`: The name of the benchmark, which is "array creation comparison 2".
* `Description` and `Script Preparation Code`, `Html Preparation Code`: These fields are empty, indicating that no additional description or preparation code is required for this benchmark.

**Individual Test Cases**

There are two test cases defined:

1. **"fill"`**
	* The `Benchmark Definition` specifies a JavaScript expression that creates an array using the `.fill()` method: `const miArray1 = Array(100).fill().map((el, i) => i)`.
2. **"spread"`**
	* This test case is identical to the previous one, with the same `Benchmark Definition`: `const miArray1 = Array(100).fill().map((el, i) => i)`.

**What are we testing?**

We're testing the performance of two array creation methods in JavaScript: `.fill()` and the spread operator (`...`).

**Options compared**

The options being compared are:

* `.fill()`: A method that fills an array with a specified value.
* Spread operator (`...`): An operator used to create a new array by spreading elements from another array.

**Pros and Cons of each approach:**

1. **`.fill()`**
	* Pros:
		+ Creates an array of the same length as the original array.
		+ Can be faster for large arrays since it doesn't involve creating multiple intermediate arrays.
	* Cons:
		+ May not work well with larger-than-memory arrays (i.e., arrays that exceed JavaScript's maximum stack size).
		+ Requires an additional `map()` call to get the desired output.
2. **Spread operator (`...`)**
	* Pros:
		+ More intuitive and readable than `.fill()`.
		+ Can handle larger-than-memory arrays more efficiently since it avoids creating intermediate arrays.
	* Cons:
		+ May be slower for small arrays due to the overhead of the spread operation.

**Library: `map()`**

The `map()` function is a built-in JavaScript function that applies a provided function to each element of an array, returning a new array with the results. In this benchmark, we're using `map()` to transform the filled array into an array of indices.

**Special JS feature/syntax: None**

There's no special JavaScript feature or syntax used in these benchmarks.

**Other alternatives**

If you wanted to test alternative array creation methods, you could consider:

* **`.slice()`**: A method that creates a shallow copy of a portion of an array.
* **`Array.from()``: A function that creates a new array from an iterable (e.g., an array or string).
* **`new Array(size)`**: A constructor function used to create a new empty array.

However, these alternatives might not be as relevant for this specific benchmark, which focuses on the performance of `.fill()` and the spread operator.

Related benchmarks:

array creation comparison 2 (version: 0)

Comparing performance of: fill vs spread

Created: 5 years ago by: Guest

Jump to the latest result

fill

spread

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):