Benchmark: new array vs new set

Tests:

new array
void []
new set
void new Set()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
new array
new set

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser/OS: Chrome 122 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
new array	1040617920.0 Ops/sec
new set	14868105.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark information.

**Benchmark Definition and Preparation Code**

The benchmark definition is a JSON object that describes the test case:

* `Name`: The name of the benchmark, which is "new array vs new set".
* `Description`: A brief description of the benchmark, but it's not provided in this case.
* `Script Preparation Code` and `Html Preparation Code`: These fields are empty, indicating that no specific setup or configuration code needs to be executed before running the test.

**Individual Test Cases**

The benchmark consists of two individual test cases:

1. **"new array"`**: The test case definition is `void []`, which means it's testing an array creation without any elements.
2. **"new set"`**: The test case definition is `void new Set()`, which creates a new instance of the Set data structure.

**Pros and Cons of Different Approaches**

The benchmark compares two approaches:

1. **Array Creation (`void []`)**: In JavaScript, arrays are created using the square bracket notation (`[]`). When creating an empty array, only memory allocation is required, as no elements need to be initialized. This approach has low overhead.
2. **Set Creation (`void new Set()`**): Sets in JavaScript are also created using the constructor function (`new Set()`). Creating a set requires more overhead than creating an array because sets have to allocate space for each element and maintain a hash table to store the elements.

**Pros of Array Creation**

* Low memory allocation overhead
* Fast initialization time

**Cons of Array Creation**

* Limited functionality compared to arrays (e.g., no built-in methods like `push()` or `indexOf()`)

**Pros of Set Creation**

* Provides a unique data structure with features like fast membership testing and set operations
* Can be useful in certain scenarios where sets are the preferred data type

**Cons of Set Creation**

* Higher memory allocation overhead compared to arrays
* Slower initialization time due to the need to allocate space for each element and maintain a hash table

**Other Considerations**

When choosing between array creation and set creation, consider the specific requirements of your application:

* If you need to perform frequent membership testing or set operations, a Set might be a better choice.
* If memory efficiency is crucial, and you don't need the additional functionality provided by Sets, an array might be a more suitable option.

**JavaScript Features**

Neither of the test cases uses special JavaScript features like async/await, closures, or modules.

Related benchmarks:

new array vs new set (version: 0)

Comparing performance of: new array vs new set

Created: one year ago by: Guest

Jump to the latest result

new array

new set

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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