Benchmark: unshift vs sorting

Script Preparation code:

var arr = [...Array(10000)].map((_,i) => i)

Tests:

unshift
arr.forEach((v,i) => { arr.unshift(arr.splice(i,1).shift()) })
swapping
arr.sort((a,b) => (a === b) ? 0 : (a < b) ? 1 : -1)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
unshift
swapping

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Definition:**
The provided JSON represents a benchmark with two test cases:

* "unshift vs sorting" is the name of the benchmark, and it compares the performance of `unshift` (adding an element to the end of the array) versus sorting the array.
* The "Script Preparation Code" specifies that an array of 10,000 elements will be created using `Array(10000).map((_,i) => i)`.

**Options Compared:**

1. **Unshift**: Adds an element to the end of the array.
	* Pros:
		+ Can be faster for small arrays since it only needs to shift a single element.
		+ Can be more cache-friendly since elements are added to the end.
	* Cons:
		+ Requires multiple iterations over the array, which can lead to slower performance for large arrays.
2. **Sorting**: Sorts the entire array in ascending or descending order.

**Pros and Cons:**
Unshift is generally faster than sorting for small arrays due to its lower overhead. However, as the array size increases, sorting becomes more efficient since it only needs to iterate over the array once. Sorting is also more cache-friendly since elements are not added to the end, reducing memory allocation and deallocation.

**Library Usage:**
In this benchmark, there is no explicit library usage mentioned in the "Script Preparation Code". However, the `Array(10000).map((_,i) => i)` expression creates an array using the built-in `Array` constructor and the spread operator (`...`). The `map()` method is also a built-in JavaScript function.

**Special JS Features/Syntax:**
The benchmark uses arrow functions (`=>`) which were introduced in ECMAScript 2015 (ES6). This allows for concise and readable code, especially when working with small scripts. There are no other special JS features or syntax mentioned in this benchmark.

**Alternative Approaches:**
Other approaches to compare the performance of `unshift` vs sorting could include:

* Using a different data structure, such as an linked list or a binary search tree.
* Adding elements to the middle or end of the array instead of unshifting.
* Using a more efficient sorting algorithm, such as merge sort or quicksort.

These alternative approaches would require modifications to the benchmark script preparation code and might not be relevant to this specific comparison.

Related benchmarks:

unshift vs sorting (version: 0)

Comparing performance of: unshift vs swapping

Created: 4 years ago by: Guest

Jump to the latest result

unshift

swapping

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):