Benchmark: Reverse string with more tests

Script Preparation code:

var string = document.documentElement.outerHTML.repeat(100);

Tests:

Array.from, reverse, join
Array.from(string).reverse().join("");
Iterate, concat
var newString = ""; for (let i = string.length - 1; i--;) { newString += string[i]; }
Iterate, push, join
var newChars = []; for (let i = string.length - 1; i--;) { newChars.push(string[i]); } newChars.join("")
iterate concat to first (charAt)
let i = string.length - 1; let result = string.charAt(i); for (;i--;) { result += string.charAt(i); }
iterate concat to first
let i = string.length - 1; let result = string[i]; for (;i--;) { result += string[i]; }
split, iterate, concat to first
const parts = string.split(""); let i = parts.length - 1; let result = parts[i]; for (;i--;) { result += parts[i]; }
split, reverse, join
string.split("").reverse().join("");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.from, reverse, join
Iterate, concat
Iterate, push, join
iterate concat to first (charAt)
iterate concat to first
split, iterate, concat to first
split, reverse, join

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser/OS: Chrome 122 on Mac OS X 10.15.7

View result in a separate tab

split, iterate, concat to first

423/s

split, reverse, join

320/s

Array.from, reverse, join

255/s

Iterate, concat

107/s

iterate concat to first

107/s

iterate concat to first (charAt)

106/s

Iterate, push, join

83/s

View exact numbers

Test name	Executions per second
✓ split, iterate, concat to first	423 Ops/sec
split, reverse, join	320 Ops/sec
Array.from, reverse, join	255 Ops/sec
Iterate, concat	107 Ops/sec
iterate concat to first	107 Ops/sec
iterate concat to first (charAt)	106 Ops/sec
Iterate, push, join	83 Ops/sec

Autogenerated LLM Summary (model gemma2:9b, generated one year ago):

LLMs can make mistakes. Check important info.

This benchmark tests different ways to reverse a string in JavaScript.

**Here's a breakdown of the approaches compared:**

* **`Array.from, reverse, join`**: This approach converts the string into an array using `Array.from()`, reverses the array with `reverse()`, and then joins the reversed elements back into a string using `join("")`.
* **`Iterate, concat`**: This method iterates through the string from the end to the beginning, concatenating each character to a new string variable.
* **`Iterate, push, join`**: Similar to the previous approach, but instead of directly concatenating characters, it pushes each character into an array and then joins the array elements back into a string.
* **`iterate concat to first (charAt)`**: This variation uses `charAt()` to access individual characters from the end of the string and build the reversed string.
* **`iterate concat to first`**:  Similar to the previous method, but it uses direct indexing (`string[i]`) instead of `charAt()`. 
* **`split, iterate, concat to first`**: This approach splits the string into an array of individual characters, iterates through the reversed array, and concatenates the characters back together.
* **`split, reverse, join`**: This method splits the string into an array of characters, reverses the array using `reverse()`, and then joins the elements back into a string.

**Pros and Cons:**

Each approach has its own trade-offs:

*  The `Array.from, reverse, join` and `split, reverse, join` methods are generally considered more readable and concise. 
* The iterative methods might be slightly slower due to the loop overhead but can be advantageous in situations where memory efficiency is a concern.

**Performance:**

The results you provided show that `Array.from, reverse, join` and `split, reverse, join` are faster than the iterative approaches.

Let me know if you'd like me to elaborate on any specific aspect or approach!

Reverse string with more tests (version: 1)

Comparing performance of: `Array.from, reverse, join vs Iterate, concat vs Iterate, push, join vs iterate concat to first (charAt) vs iterate concat to first vs split, iterate, concat to first vs split, reverse, join`

Created: 4 years ago by: Registered User

Go to the latest result

Array.from, reverse, join

Iterate, concat

Iterate, push, join

iterate concat to first (charAt)

iterate concat to first

split, iterate, concat to first

split, reverse, join

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gemma2:9b, generated one year ago):

Reverse string with more tests (version: 1)

Comparing performance of: Array.from, reverse, join vs Iterate, concat vs Iterate, push, join vs iterate concat to first (charAt) vs iterate concat to first vs split, iterate, concat to first vs split, reverse, join

Created: 4 years ago by: Registered User

Go to the latest result

Array.from, reverse, join

Iterate, concat

Iterate, push, join

iterate concat to first (charAt)

iterate concat to first

split, iterate, concat to first

split, reverse, join

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gemma2:9b, generated one year ago):

Related benchmarks

Comparing performance of: `Array.from, reverse, join vs Iterate, concat vs Iterate, push, join vs iterate concat to first (charAt) vs iterate concat to first vs split, iterate, concat to first vs split, reverse, join`