Benchmark: Filling an array

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Script Preparation code:

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async function globalMeasureThatScriptPrepareFunction() {
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Tests:

Regular
const position = "Midfielder" Array(100).fill(position).map((p) => [crypto.randomUUID(), p])
Test
const position = "Midfielder" Array.from({ length: 100 }, () => [crypto.randomUUID(), position])

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Regular
Test

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; rv:134.0) Gecko/20100101 Firefox/134.0

Browser/OS: Firefox 134 on Mac OS X 10.15

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Test name	Executions per second
Regular	24307.1 Ops/sec
Test	23712.8 Ops/sec

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

LLMs can make mistakes. Check important info.

The benchmark you provided compares two methods for filling and transforming an array in JavaScript, specifically focusing on different approaches to create an array filled with a specific value and then returning an array of tuples.

### Test Cases Explained:

1. **Regular Method**:
   ```javascript
   const position = "Midfielder";
   Array(100).fill(position).map((p) => [crypto.randomUUID(), p]);
   ```
   - In this method, an array of length 100 is created and filled with the string "Midfielder". The `map` function is then used to transform each element into a tuple that consists of a unique identifier (generated using `crypto.randomUUID()`) and the position.
   - **Pros**:
     - Simple and straightforward for users familiar with `map`.
     - `Map` provides a functional and expressive way to transform arrays.
   - **Cons**:
     - It involves two operations: first filling the array and then transforming it, which may lead to higher computational overhead, especially for larger arrays.

2. **Test Method**:
   ```javascript
   const position = "Midfielder";
   Array.from({ length: 100 }, () => [crypto.randomUUID(), position]);
   ```
   - This method creates a new array of length 100 using `Array.from`, where each element is generated on-the-fly with a tuple containing a unique identifier and the position.
   - **Pros**:
     - Only one operation is needed, as `Array.from` takes care of both creation and assignment in one step.
     - It can be more memory-efficient as values are generated dynamically.
   - **Cons**:
     - Slightly less intuitive for those who are more familiar with traditional array methods like `fill` and `map`.

### Performance Results:

- The test results indicate the number of executions per second for each method:
  - **Regular Method**: Approximately 24,307 executions per second.
  - **Test Method**: Approximately 23,712 executions per second.

The Regular Method outperformed the Test Method by a slight margin in this particular test scenario, although both approaches delivered reasonably high execution rates.

### Other Considerations:

- **Library and Features**: The benchmark leverages the `crypto` API from the Web Cryptography API to generate unique identifiers with `crypto.randomUUID()`. This is a built-in JavaScript feature that allows developers to create UUIDs without third-party libraries.
- **JavaScript Syntax**: The use of `Array.from` is a modern JavaScript feature introduced in ES6 (ECMAScript 2015), which offers a concise way of constructing arrays. It is inherently more versatile than the older array construction methods.

### Alternatives:

- **Using Loops**: A traditional `for` or `while` loop could be used to create and fill the array. This may lead to more verbose code, but can sometimes be more performant and easier to optimize based on the specific needs.
- **`new Array()` in Combination with `forEach`**: It's possible to create an empty array and fill values using a forEach loop, but this method may lead to more complex, less maintainable code.
- **`map` with Predefined Values**: Instead of using `fill`, a new array could be created directly from an existing array of values using `map`, which allows for custom initialization.

Ultimately, the choice of method may depend on personal or team coding style preferences, the specific performance requirements of the application, and considerations for readability and maintainability of the code.

Related benchmarks:

Filling an array (version: 1)

Comparing performance of: Regular vs Test

Created: one year ago by: Registered User

Jump to the latest result

Regular

Test

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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