Benchmark: Array Initialization Types v3

Script Preparation code:

var times = 5000;

Tests:

Array Constructor
var a = new Array(); for (var i = 0; i <= times; i++) { a.push(1337) }
Array Size Constructor
var b = new Array(times); for (var i = 0; i <= times; i++) { b.push(1337) }
Array Literal
var c = []; for (var i = 0; i <= times; i++) { c.push(1337) }
Fill Map
new Array(10).fill().map((_arg) => 1337)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array Constructor
Array Size Constructor
Array Literal
Fill Map

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks and explore what's being tested in the provided benchmark.

**Benchmark Definition**

The benchmark definition is a JSON object that provides metadata about the test suite, including:

* `Name`: A human-readable name for the benchmark (Array Initialization Types v3).
* `Description`: An optional description of the benchmark (null in this case).
* `Script Preparation Code` and `Html Preparation Code`: These are placeholders for code that prepares the test environment.

In this case, there's no actual script preparation code provided. The script itself is embedded directly in the benchmark definition.

**Individual Test Cases**

The benchmark consists of four individual test cases:

1. **Array Constructor**: Tests the performance of creating an array using the `new Array()` constructor.
2. **Array Size Constructor**: Tests the performance of creating an array using the `new Array(times)` syntax, where `times` is a variable set to 5000.
3. **Array Literal**: Tests the performance of creating an array using the literal notation (`[]`).
4. **Fill Map**: Tests the performance of creating an array using the `fill()` method and then applying a transformation function to it (using arrow functions).

**Library Usage**

None of the test cases explicitly use a library, but we can infer that the benchmark is designed for testing JavaScript engine-specific features.

**Special JS Features/Syntax**

There are two notable features:

1. **Arrow Functions**: The `Fill Map` test case uses an arrow function to transform the array created by `fill()`.
2. **Variable `times`**: The `Array Size Constructor` and `Fill Map` test cases use a variable `times` set to 5000.

**Options Compared**

The benchmark compares the performance of four different approaches to creating arrays:

1. **Array Constructor**
2. **Array Size Constructor** (using `new Array(times)`)
3. **Array Literal** (`[]`)
4. **Fill Map** (using `fill()` and arrow functions)

**Pros and Cons**

Each approach has its own pros and cons:

1. **Array Constructor**: Generally faster, but may have memory allocation overhead.
2. **Array Size Constructor**: May be slower due to the need for explicit size specification, but can avoid memory allocation overhead.
3. **Array Literal**: Fastest, as it avoids any function calls or variable assignments.
4. **Fill Map**: Slower than literal notation, but can offer benefits like improved code readability and maintainability.

**Other Alternatives**

To improve performance or achieve different trade-offs, other alternatives could be explored:

* Using `int32Array` or `uint8Array` instead of `Array` for specific use cases.
* Optimizing the benchmark script to reduce overhead (e.g., by reducing the size of the array or using smaller data types).
* Using specialized libraries or frameworks that offer optimized array creation and manipulation.

Keep in mind that this is a simplified analysis, and actual performance differences may vary depending on the JavaScript engine, browser, and specific use case.

Related benchmarks:

Array Initialization Types v3 (version: 0)

Comparing performance of: Array Constructor vs Array Size Constructor vs Array Literal vs Fill Map

Created: 3 years ago by: Guest

Jump to the latest result

Array Constructor

Array Size Constructor

Array Literal

Fill Map

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):