Benchmark: skidadle skidoodle

Script Preparation code:

var arr = Array.from({length: 100000}, () => Math.random() > 0.5 ? "asdasd" : [])

Tests:

без переменной
var xs = arr.map(x => Array.isArray(x))
с переменной
var isArray = Array.isArray var xs = arr.map(x => isArray(x))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
без переменной
с переменной

Fastest: N/A

Slowest: N/A

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/120.0.0.0 Safari/537.36

Browser/OS: Chrome 120 on Windows

View result in a separate tab

с переменной

304/s

без переменной

39/s

View exact numbers

Test name	Executions per second
✓ с переменной	304 Ops/sec
без переменной	39 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases to understand what's being tested.

**Benchmark Definition**
The benchmark is defined by a JSON object with two properties:

* `Script Preparation Code`: This code snippet is executed once before running the actual benchmark. In this case, it creates an array of 100,000 random elements using `Array.from()` and some conditional statements.
* `Html Preparation Code`: This property is empty in this example.

**Individual Test Cases**
There are two test cases:

1. **Without Variable (`без переменной`)**: The benchmark definition uses the `map()` function on the `arr` array without referencing a variable named `isArray`. Instead, it directly checks if each element of the array is an array using `Array.isArray(x)`.
2. **With Variable (`с переменная`)**: This test case defines a variable named `isArray` and then uses it to check if each element of the `arr` array is an array using `isArray(x)`.

**Libraries Used**
There isn't a specific library mentioned in this benchmark definition, but `Array.prototype.map()` is a built-in JavaScript function. However, some browsers might have variations or extensions to this function that could be considered libraries by some definitions (e.g., ES6+ support).

**Special JS Features/Syntax**
No special JavaScript features or syntax are being tested in these benchmarks.

**Pros and Cons of Different Approaches**

* **Without Variable (`без переменной`)**:
	+ Pros: Simple, doesn't require creating a new variable.
	+ Cons: Might be less readable or maintainable for some developers due to the lack of explicit variable declaration.
* **With Variable (`с переменная`)**:
	+ Pros: Can improve readability and maintainability by explicitly declaring a variable to hold the result of `Array.isArray(x)`.
	+ Cons: Requires creating an additional variable, which might be overkill for simple use cases.

**Other Considerations**

* The use of `Array.isArray()` with a single argument is supported in modern JavaScript (ES6+) and most browsers.
* If this benchmark was running on older browsers that don't support `Array.isArray()`, the test case without a variable would fail.

**Alternative Approaches**
If you want to write similar benchmarks, consider the following:

* Use more explicit variable declarations or const/let/this for improved readability and maintainability.
* Test different scenarios, such as:
	+ Using `map()` with a callback function that returns an array instead of a boolean value.
	+ Testing error handling (e.g., what happens when `Array.isArray(x)` throws an exception?).
	+ Comparing performance across different browsers or platforms.

Overall, this benchmark is testing the performance of JavaScript's `Array.prototype.map()` function in two slightly different scenarios. By comparing the results between these test cases and using the right approach (with or without a variable), developers can gain insight into how their code might perform in different situations.

skidadle skidoodle (version: 0) Benchmark.js

Comparing performance of: `без переменной vs с переменной`

Created: 2 years ago by: Guest

Go to the latest result

без переменной

с переменной

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

skidadle skidoodle (version: 0) Benchmark.js

Comparing performance of: без переменной vs с переменной

Created: 2 years ago by: Guest

Go to the latest result

без переменной

с переменной

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

Comparing performance of: `без переменной vs с переменной`