Benchmark: set vs array iterationgfgdhahtfdgcvfgshjrhdgfd

Script Preparation code:

const a = [];
for (let i = 0; i < 10000; i++) { a.push(i); };
const b = new Set(a)

Tests:

array
for (const x of a) { void x; };
set
for (const x of b) { void x; };

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
array
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/605.1.15 (KHTML, like Gecko) Version/18.1 Safari/605.1.15

Browser/OS: Safari 18 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
array	83673.8 Ops/sec
set	22134.4 Ops/sec

Autogenerated LLM Summary (model gpt-4o-mini, generated one year ago):

LLMs can make mistakes. Check important info.

The benchmark defined in the provided JSON is comparing the performance of iterating over two different data structures in JavaScript: an array and a set. The specific operations being measured are the time taken to iterate through each structure.

### Benchmark Structure

1. **Preparation Code**:
   - An array `a` is created containing the integers from 0 to 9999 (inclusive) using a simple for-loop.
   - A `Set` object `b` is then created from the array `a`. In JavaScript, a `Set` is a built-in object that holds a collection of unique values, meaning it automatically removes duplicates.

2. **Test Cases**:
   - The benchmark runs two tests:
     - **Array iteration**: Using a `for...of` loop to iterate over the elements in the array `a`.
     - **Set iteration**: Using a `for...of` loop to iterate over the unique values stored in the set `b`.

### Performance Results

The results from the benchmark indicate that the array iteration outperforms the set iteration significantly. The "ExecutionsPerSecond" metric shows:
- Array iteration: **83,673.84** executions per second
- Set iteration: **22,134.39** executions per second

### Pros and Cons of Each Approach

#### Array Iteration:
- **Pros**:
  - Faster iteration for the given benchmark, as shown in the results.
  - Simple and straightforward syntax, making it easy to understand and use in general programming contexts.
  - Arrays maintain the order of elements, which is beneficial when the sequence of inputs matters.

- **Cons**:
  - Arrays can contain duplicate values, which may lead to unexpected results if uniqueness is required.
  - Performance might degrade with larger datasets, particularly if manipulation (insertion, deletion) is frequent.

#### Set Iteration:
- **Pros**:
  - Automatically enforces uniqueness, ensuring only distinct values are stored.
  - Potentially more efficient for certain operations that involve checking for existence (i.e., `has` method) compared to arrays.
  - Sets may provide better performance in scenarios where frequent membership checks are necessary.

- **Cons**:
  - Slower iteration performance compared to arrays in this specific benchmark.
  - May require more memory overhead to maintain uniqueness compared to an array, particularly with a large number of elements.
  - Does not maintain element order as well as arrays, which may be a disadvantage if the order is significant.

### Other Considerations
- When deciding between using an array or a set, the structure of your data and the operations that will be performed on it should be carefully considered. If you need rapid iteration and order, an array is preferable; if you need uniqueness and frequent membership checks, a set may be the better choice.
- For large datasets, the choice of data structure can greatly influence performance, and using appropriate benchmarking tools like MeasureThat.net helps developers understand the trade-offs in different environments.
- Alternatives to these structures include using maps for key-value pairs or employing custom data structures depending on specific application needs.

Overall, the benchmark highlights important aspects of performance when working with built-in JavaScript data structures, helping developers make informed decisions when developing applications.

Related benchmarks:

set vs array iterationgfgdhahtfdgcvfgshjrhdgfd (version: 1)

Comparing performance of: array vs set

Created: one year ago by: Guest

Jump to the latest result

array

set

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated one year ago):