Benchmark: zzzzzzz - MeasureThat.net

Tests:

x
[...Array(10000)]
y
Array(10000).fill()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
x
y

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one month 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 represented by a JSON object with four properties: `Name`, `Description`, `Script Preparation Code`, and `Html Preparation Code`. However, these fields are all null, which means that the benchmark script doesn't require any preparation code. This suggests that the focus of the benchmark is on measuring the performance of JavaScript execution itself.

**Individual Test Cases**

The individual test cases are represented by an array of objects, each containing two properties: `Benchmark Definition` and `Test Name`. These test cases define different ways to create an array in JavaScript:

1. The first test case uses a loop to create an array with 10,000 elements:
```javascript
const arr = [];
for (let i = 0; i < 10000; i++) {
  arr.push(i);
}
```
2. The second test case uses the `fill()` method to create an array with 10,000 elements filled with a specific value ( likely `undefined` or `null`, but not explicitly specified):
```javascript
const arr = Array(10000).fill();
```
**Comparison of Options**

There are three main options being compared here:

1. **Loops**: The first test case uses a loop to create an array, which can be slower than other methods because it involves explicit iteration.
2. **`fill()` method**: The second test case uses the `fill()` method to create an array, which is generally faster than using loops. However, if the value being filled is not explicitly specified, this might lead to unexpected results or performance issues.
3. **Array constructor**: Not shown in the provided benchmark definition, but another way to create an array is by using the array constructor (e.g., `new Array(10000)`). This method is likely to be faster than loops and the `fill()` method.

**Pros and Cons**

* **Loops**:
	+ Pros: Easy to understand and implement.
	+ Cons: Can be slower due to explicit iteration.
* **`fill()` method**:
	+ Pros: Generally faster than loops, but may lead to unexpected results if the value is not explicitly specified.
	+ Cons: May not work as expected with certain values or browsers.
* **Array constructor**:
	+ Pros: Likely to be faster and more efficient than loops and `fill()` method.
	+ Cons: May require more memory allocation.

**Library**

None of the test cases use any libraries. They only rely on built-in JavaScript features.

**Special JS Features/Syntax**

The provided benchmark definition does not include any special JavaScript features or syntax, such as async/await, promise chains, or experimental features like `let` or `const` with dynamic scoping.

**Other Alternatives**

If you wanted to create an array in JavaScript, other alternatives could be:

* Using a library like Lodash's `times()` function: `_.times(10000, (i) => { ... });`
* Using a library like Ramda's `range()` function: `(range(0, 10_000)(i => ({...})))`
* Using a library like TypedArrays or DataView objects for more efficient array manipulation

Keep in mind that these alternatives might not be as relevant to this specific benchmark definition, which focuses on measuring the performance of basic JavaScript array creation methods.

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:74.0) Gecko/20100101 Firefox/74.0

Browser/OS: Firefox 74 on Windows

View result in a separate tab

Test name	Executions per second
x	4048.4 Ops/sec
y	11906.6 Ops/sec

Related benchmarks:

zzzzzzz (version: 0)

Comparing performance of: x vs y

Created: 4 years ago by: Guest

Jump to the latest result

x

y

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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