Benchmark: Copy and remove - MeasureThat.net

Tests:

slice + concat
const array = [18, 40, 83, 94, 58, 45, 90, 48, 84, 59, 24, 34, 36, 99, 84, 51, 14, 31, 79, 90, 43, 51, 56, 77, 95, 85, 10, 21, 60, 99, 58, 38, 16, 19, 55, 57, 63, 82, 9, 78, 15, 89, 50, 56, 29, 34, 69, 53, 87, 53, 29, 27, 88, 94, 46, 20, 88, 93, 47, 40, 22, 23, 2, 48, 24, 37, 18, 61, 91, 37, 95, 86, 14, 4, 11, 49, 96, 57, 93, 17, 60, 21, 2, 61, 16, 67, 5, 7, 93, 91, 73, 3, 91, 17, 55, 30, 3, 83, 24, 64]; const indexToRemove = Math.floor(Math.random() * 100); const copy = array.slice(0, indexToRemove).concat(array.slice(indexToRemove + 1))
spread + splice
const array = [18, 40, 83, 94, 58, 45, 90, 48, 84, 59, 24, 34, 36, 99, 84, 51, 14, 31, 79, 90, 43, 51, 56, 77, 95, 85, 10, 21, 60, 99, 58, 38, 16, 19, 55, 57, 63, 82, 9, 78, 15, 89, 50, 56, 29, 34, 69, 53, 87, 53, 29, 27, 88, 94, 46, 20, 88, 93, 47, 40, 22, 23, 2, 48, 24, 37, 18, 61, 91, 37, 95, 86, 14, 4, 11, 49, 96, 57, 93, 17, 60, 21, 2, 61, 16, 67, 5, 7, 93, 91, 73, 3, 91, 17, 55, 30, 3, 83, 24, 64] const indexToRemove = Math.floor(Math.random() * 100); const copy = [...array]; copy.splice(indexToRemove, 1);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice + concat
spread + splice

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what is being tested, compared, and its pros and cons.

**Benchmark Definition**

The benchmark definition represents a JavaScript code snippet that creates an array of numbers and removes a random element from it using two different approaches:

1. `slice + concat`: This approach uses the `slice()` method to create a new array containing the elements before the removal index and concatenates it with the remaining elements using the `concat()` method.
2. `spread + splice`: This approach uses the spread operator (`...`) to create a copy of the original array, and then removes an element from the copied array using the `splice()` method.

**What is being tested?**

The benchmark is testing the performance difference between these two approaches when removing an element from an array in JavaScript. Specifically, it's measuring how many elements are executed per second (ExecutionsPerSecond) for each approach on different browsers and devices.

**Options compared**

We have two options being compared:

1. `slice + concat`
2. `spread + splice`

**Pros and Cons of each approach:**

**`slice + concat`:**

Pros:

* Well-supported by most JavaScript engines
* Can be used in older browsers that don't support modern spread operators

Cons:

* Creates a new array object, which can lead to memory allocation overhead
* Requires two method calls (slice() and concat()), which may introduce additional overhead

**`spread + splice`:**

Pros:

* More efficient than `slice + concat` since it only creates a copy of the original array using the spread operator
* Reduces the number of method calls required, potentially leading to better performance

Cons:

* Requires modern JavaScript engines that support the spread operator (e.g., ECMAScript 2015+)
* May not work in older browsers or environments that don't support this syntax

**Library and special JS feature used**

There is no explicit library mentioned in the benchmark definition. However, it's worth noting that both approaches use built-in JavaScript methods (`slice()`, `concat()`, and `splice()`).

The spread operator (`...`) used in the `spread + splice` approach is a modern JavaScript feature introduced in ECMAScript 2015.

**Other considerations**

* The benchmark uses Chrome OS as the device platform, which may introduce unique performance characteristics compared to other platforms.
* The test cases only cover removing an element from an array, so the results might not generalize to other use cases.

**Alternatives**

If you were to rewrite this benchmark with different approaches or using a library, some alternatives could be:

1. Using a custom-built data structure (e.g., a linked list) instead of arrays.
2. Implementing your own array removal algorithm using bitwise operations (e.g., shifting and masking).
3. Utilizing parallel processing or multi-threading to remove elements from multiple arrays simultaneously.
4. Comparing the performance of different JavaScript engines, such as V8, SpiderMonkey, or SquirrelFish.

Keep in mind that these alternatives would likely require significant changes to the benchmark definition and implementation to ensure accurate and relevant results.

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (X11; CrOS x86_64 11021.81.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36

Browser/OS: Chrome 70 on Chrome OS 11021.81.0

View result in a separate tab

Test name	Executions per second
slice + concat	1040948.1 Ops/sec
spread + splice	791120.0 Ops/sec

Related benchmarks:

Copy and remove (version: 0)

Comparing performance of: slice + concat vs spread + splice

Created: 5 years ago by: Guest

Jump to the latest result

slice + concat

spread + splice

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):