Benchmark: Test array vide - MeasureThat.net

Script Preparation code:

var b = []

Tests:

func return empty
const a = () => { return b.map((x) => x.item) }
func return direct
const a = () => { return b }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
func return empty
func return direct

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36

Browser/OS: Chrome 109 on Linux

View result in a separate tab

Test name	Executions per second
func return empty	1160233728.0 Ops/sec
func return direct	872756288.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the benchmark definition and explain what's being tested, compared, and some pros and cons of each approach.

**Benchmark Definition**

The provided JSON represents a JavaScript microbenchmark. Here's a breakdown of its contents:

* `Name` and `Description`: These fields are empty in this case, but they can contain meaningful information about the benchmark.
* `Script Preparation Code` and `Html Preparation Code`: The script preparation code initializes an empty array `b`. This is done to provide a consistent starting point for each test case. The html preparation code is also empty, which means there's no HTML markup being used in this benchmark.

**Individual Test Cases**

There are two test cases:

1. **`func return empty`**
	* `Benchmark Definition`: This script defines a function `a` that returns the result of mapping over an empty array `b`.
	* Pros: This approach tests the performance of a simple, well-defined operation (mapping over an empty array).
	* Cons: The benchmark might not be representative of real-world scenarios, as an empty array is unlikely to occur in most cases.
2. **`func return direct`**
	* `Benchmark Definition`: This script defines a function `a` that returns the entire array `b` directly.

**Comparison**

The two test cases are designed to compare the performance differences between returning an empty array and returning the entire array directly. The idea is to see which approach is faster in terms of execution time.

**Library: Lodash (not explicitly mentioned but inferred)**
The use of `b.map((x) => x.item)` suggests that the `item` property is a part of the `x` object, possibly an item within the array. This might be a reference to the Lodash library, which provides a method called `map()` for transforming arrays.

**Special JS feature: No special features are explicitly mentioned in this benchmark.**

**Other Alternatives**

If you wanted to create similar benchmarks, here are some alternative approaches:

1. Test array push vs. array slice:
```javascript
const b = [];
// Benchmark 1: Push a million elements
for (let i = 0; i < 1000000; i++) {
    b.push(i);
}

// Benchmark 2: Slice the entire array
const slicedB = b.slice();
```
2. Test object iteration vs. for loop:
```javascript
const obj = { foo: 'bar', baz: 'qux' };

// Benchmark 1: Iterate over properties using `for...in`
let sum = 0;
for (const key in obj) {
    sum += parseInt(key);
}

// Benchmark 2: Use a for loop to iterate and sum values
let sumForLoop = 0;
for (let i = 0; i < Object.keys(obj).length; i++) {
    const key = Object.keys(obj)[i];
    sumForLoop += parseInt(key);
}
```
These alternative benchmarks can help you explore different aspects of JavaScript performance, such as array manipulation, object iteration, or loop optimization techniques.

Related benchmarks:

Test array vide (version: 0)

Comparing performance of: func return empty vs func return direct

Created: one year ago by: Guest

Jump to the latest result

func return empty

func return direct

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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