Benchmark: array creation shenanigans

Tests:

string crap
var r = ' '.repeat(10).split('').map(e => 1)
bulky loops
var r = []; for(var i = 0; i < 10; i++) { r.push(1) }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
string crap
bulky loops

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

I'd be happy to help you understand what's being tested in the provided benchmark.

**Benchmark Definition**

The benchmark definition is not provided, but we can analyze the individual test cases to determine what's being measured.

**Individual Test Cases**

There are two test cases:

1. **"string crap"`**
	* Benchmark Definition: `var r = ' '.repeat(10).split('').map(e => 1)`
	* This test case creates an array by repeating a string of space characters (`' '`), splitting it into individual characters, and then mapping each character to a value of 1.
2. **"bulky loops"`**
	* Benchmark Definition: `var r = [];\r\nfor(var i = 0; i < 10; i++)\r\n{\r\n  r.push(1)\r\n}`
	* This test case creates an empty array and then uses a loop to push the value 1 into it 10 times.

**What's being tested?**

Both test cases are measuring the performance of creating and manipulating arrays in JavaScript. The tests are comparing different approaches:

* **String repetition**: Creating an array by repeating a string of characters, splitting it, and mapping each character to a value.
* **Array creation with loop**: Creating an empty array and then using a loop to push values into it.

**Pros and Cons of Different Approaches**

1. **String Repetition**
	* Pros:
		+ Concise and readable code
		+ No explicit loop required
	* Cons:
		+ May be slower due to the overhead of string manipulation (e.g., creating a new string, splitting it)
2. **Array Creation with Loop**
	* Pros:
		+ Direct control over array creation and element assignment
		+ Can be optimized for specific use cases (e.g., pushing multiple elements at once)
	* Cons:
		+ Requires explicit loop handling, which can add overhead

**Libraries Used**

None are explicitly mentioned in the provided benchmark definition. However, if a library like Lodash or Array.prototype methods (e.g., `Array.prototype.fill()`, `Array.prototype.map()`) were used, they could potentially impact performance.

**Special JS Features/Syntax**

There is no indication of special JavaScript features or syntax being used beyond standard ECMAScript functionality.

**Other Alternatives**

If you wanted to create similar benchmarks for different array creation methods or libraries, consider exploring the following alternatives:

* Creating an array using `Array.from()` or `Array.of()`
* Using a library like Lodash's `repeat()` function
* Comparing performance with and without optimization techniques (e.g., using `const` for variables, avoiding unnecessary allocations)

Keep in mind that the specific implementation details can vary depending on your requirements and testing goals.

Related benchmarks:

array creation shenanigans (version: 0)

Comparing performance of: string crap vs bulky loops

Created: 8 years ago by: Guest

Jump to the latest result

string crap

bulky loops

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):