Benchmark: replaceAll vs regex replace 1:1

Script Preparation code:

String.prototype.replaceAll = function(search, replacement) {
    var target = this;
    return target.replace(new RegExp(search, 'g'), replacement);
};

Tests:

replace regex
"this is it".replace(/ /g, "+");
replace All
"this is it".replaceAll(/ /, "+");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
replace regex
replace All

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/130.0.0.0 Safari/537.36

Browser/OS: Chrome 130 on Linux

View result in a separate tab

Test name	Executions per second
replace regex	13253964.0 Ops/sec
replace All	5949685.5 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and considered.

**Overview**

The benchmark tests two approaches to replace characters in a string: using `String.prototype.replaceAll` (referred to as "replace All") and using regular expressions with the `replace()` method (referred to as "replace Regex").

**Options Compared**

1. **String.prototype.replaceAll**
	* This is a custom implementation of the `replaceAll()` method, which replaces all occurrences of a substring in a string.
	* Pros: Can be faster than using regular expressions for simple replacements.
	* Cons:
		+ It's not a standard method, so it may not work across different browsers or JavaScript environments.
		+ It doesn't support the `g` flag (global match), which means it will only replace the first occurrence of the substring.
2. **Regular Expressions with replace()**
	* This is the traditional way to perform string replacements using regular expressions.
	* Pros:
		+ Widely supported across different browsers and JavaScript environments.
		+ Supports the `g` flag, which allows for global matching.
	* Cons:
		+ Can be slower than custom implementations like `replaceAll()` for simple replacements.

**Library/ Framework Considerations**

None are explicitly mentioned in the provided benchmark definition. However, it's worth noting that both approaches rely on JavaScript's built-in string manipulation methods.

**Special JS Features/Syntax**

None are mentioned in this specific benchmark definition. However, it's worth mentioning that some other benchmarks might test features like `let`, `const`, or modern syntax like template literals or async/await.

**Other Alternatives**

If you wanted to measure the performance of these approaches using a different method, here are some alternatives:

1. **Using a testing framework**: Instead of creating a custom benchmark, you could use an existing testing framework like Jest or Mocha to create and run your benchmarks.
2. **Using a profiling tool**: Tools like Chrome DevTools or Node.js Inspector can provide detailed information about the execution time and memory usage of different code paths.
3. **Using a benchmarking library**: Libraries like Benchmark.js or Fastest-Python can help you write and compare benchmarks in a more structured way.

In summary, this benchmark tests two approaches to string replacement: using `String.prototype.replaceAll` (custom implementation) and regular expressions with the `replace()` method (traditional approach). It compares their performance on different browsers and devices.

Related benchmarks:

replaceAll vs regex replace 1:1 (version: 0)

Comparing performance of: replace regex vs replace All

Created: 3 years ago by: Guest

Jump to the latest result

replace regex

replace All

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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