Benchmark: regex vs split + join2

Script Preparation code:

var str = 'KA|1092|200092|16 Pin" Universal Connecting Cable," 100cm|||16 Pin Universa"l Connecting Cable, 100cm||||Lagerartikel|Löschbar|Voll|2003-11-26 14:46:12 |2015-08-21 14:18:52 |2015-08-21 13:54:33 |Stk|Stk|||| ||0||               ||1.000000|0.000000|0.000000|1.000000|0.000000|1.000000|0.000000|1|Triemli|1|1|1|||||||||0.000000||||||30."07.2015||||"0|0|0|0"|0|0||0|0|0|"0|0|0|||0|0"|0|0|Spital|0|0"|300.301|279.09"|0|0|0|0|0"|0|0|0|0"|0|0|0|0|0|0"|0|0|0|"0|0|0|0|0|0|CHF"|||304.04"|Div. Zubehör|||||||"4021a10|"K" Herzkatheteruntersuchungsmat". - Material|p_voll|"p_voll|r_voll|r_voll||||||||||0|||';

Tests:

regex
str.replace(/"/g, '\\”');
split + join
str.split('"').join('\\"');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
regex
split + join

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36

Browser/OS: Chrome 84 on Mac OS X 10.15.5

View result in a separate tab

Test name	Executions per second
regex	1085049.4 Ops/sec
split + join	1131971.6 Ops/sec

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's being tested.

**Benchmark Definition:**

The benchmark definition consists of two individual test cases:

1. `str.replace(/"'/g, '\\“');`: This test case uses the `replace()` method with a regular expression to replace double quotes (`"`) with a specific Unicode character (`\u201c`).
2. `str.split('"').join('\\\\"'`;`: This test case splits the input string into an array using single quotes (`'`) as the separator and then joins the array elements back together using double-backslashes (`\\\\`) to escape the double quotes.

**Options compared:**

The two options being compared are:

* Using the `replace()` method with a regular expression
* Using the `split()` and `join()` methods in combination

**Pros and Cons of each approach:**

1. **`replace()` method with regular expression:**
	* Pros:
		+ Can be more efficient for simple cases, as it only iterates over the string once.
		+ Allows for more complex search patterns using regular expressions.
	* Cons:
		+ May not perform well on very large strings or those with many occurrences of the matched pattern.
		+ Can be slower due to the overhead of compiling and executing the regular expression.
2. **`split()` and `join()` methods:**
	* Pros:
		+ Typically faster for larger inputs, as it avoids iterating over the string multiple times.
		+ More readable and easier to understand, especially for simple cases.
	* Cons:
		+ May not be suitable for very large strings or those with many separators.
		+ Requires more memory to store the intermediate array.

**Library and purpose:**

In this benchmark, no libraries are explicitly mentioned. However, some JavaScript features are used:

* **Regular expressions:** Used in the `replace()` method to match patterns in the input string.
* **Unicode escape sequences:** Used in the `join()` method to properly escape double quotes (`"`) when joining array elements.

**Special JS feature:**

No special JavaScript features or syntax are mentioned in this benchmark. The focus is on comparing two common approaches for processing strings.

**Other alternatives:**

While not explicitly mentioned, other alternatives to consider might include:

* Using `substring()` or `substr()` methods to extract specific parts of the string.
* Utilizing `Array.prototype.map()` and `Array.prototype.join()` methods for more complex string manipulation tasks.
* Leveraging modern JavaScript features like template literals (`${}`) or regex capabilities (e.g., `RegExp.test()`) for efficient string processing.

Keep in mind that this benchmark is focused on comparing two specific approaches, so exploring other alternatives might not be directly relevant to the comparison being made.

Related benchmarks:

regex vs split + join2 (version: 0)

Comparing performance of: regex vs split + join

Created: 4 years ago by: Guest

Jump to the latest result

regex

split + join

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):