Benchmark: Write Float64Array index vs Array push

Tests:

Write Float64Array by index
const ta = new Float64Array(100_000) for (let i = 0; i < 100_000; i++) ta[i] = i
Write generic array by push
const ga = [] for (let i = 0; i < 100_000; i++) ga.push(i)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Write Float64Array by index
Write generic array by push

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark and explain what's being tested, compared, and the pros/cons of each approach.

**Benchmark Description:**

The test aims to compare the performance of initializing a typed array by index versus using the generic Array API with `push()` method.

In JavaScript, there are two primary types of arrays: typed arrays and generic arrays. Typed arrays are specialized for specific data types (e.g., `Float64Array`, `Int32Array`) and offer better performance when working with that type.

**Options Compared:**

The benchmark compares two approaches:

1. **Typed Array by Index**: Creating a `Float64Array` instance using the `new Float64Array(size)` constructor, where `size` is the length of the array to be created.
2. **Generic Array by Push**: Creating an empty array using `[]`, and then pushing elements onto it using the `push()` method.

**Pros and Cons:**

1. **Typed Array by Index**:
	* Pros:
		+ Better performance, as it avoids the overhead of the `push()` method.
		+ More efficient memory allocation, as the array is created with a fixed size.
	* Cons:
		+ Limited to specific data types (e.g., float, int), which may not be suitable for all use cases.
2. **Generic Array by Push**:
	* Pros:
		+ More flexible, as it can handle any type of value.
	* Cons:
		+ Slower performance due to the overhead of the `push()` method and dynamic memory allocation.

**Library Used:**

In the benchmark code, a library called `Float64Array` is used. This is a typed array that provides efficient storage for 64-bit floating-point numbers.

**Special JS Features/Syntax:**

None mentioned in this specific benchmark.

**Other Alternatives:**

Before using these approaches, developers may consider other alternatives:

* Using `Array.from()` method to create an array from a given iterable, which can be more flexible than creating an empty array and then pushing elements.
* Using the `Map` or `Set` data structures for storing key-value pairs or unique values, respectively.

**Benchmark Preparation Code:**

As mentioned in the benchmark definition, there is no preparation code provided. The actual performance comparison is executed during the test runs.

**Individual Test Cases:**

The benchmark defines two individual test cases:

1. **Write Float64Array by index**: This test case creates a `Float64Array` instance and initializes it with 100,000 elements using a loop.
2. **Write generic array by push**: This test case creates an empty array and pushes 100,000 elements onto it using a loop.

These test cases measure the performance of initializing typed arrays versus using the generic Array API with `push()`.

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36

Browser/OS: Chrome 98 on Windows

View result in a separate tab

Test name	Executions per second
Write Float64Array by index	2276.4 Ops/sec
Write generic array by push	911.9 Ops/sec

Related benchmarks:

Write Float64Array index vs Array push (version: 0)

Test initializing a typed array by index vs generic array by push.

Comparing performance of: Write Float64Array by index vs Write generic array by push

Created: 2 years ago by: Guest

Jump to the latest result

Write Float64Array by index

Write generic array by push

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):