Benchmark: replaceAll browser vs regex replace

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

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided JSON data and explain what's being tested.

**Overview**
The benchmark is designed to compare two approaches: using the `replace()` method with regular expressions (`/ /g, "+"`), and using the `replaceAll()` method with a replacement string (`" \", "+"`).

**What's being compared?**

1. **Regular Expressions (Regex)**: The `replace()` method uses Regex to search for spaces (`/ /`) in the string `"this is it"`, and replaces them with `+`. This approach allows for more complex pattern matching, but can be slower due to the overhead of parsing and executing the regex.
2. **String Replacement**: The `replaceAll()` method takes a replacement string (`"+"`), which is applied directly to the original string without any additional processing.

**Pros and Cons**

1. **Regex (replace())**:
	* Pros:
		+ Can handle more complex patterns, such as multiple spaces or special characters.
		+ Can be used for other tasks beyond simple string replacement.
	* Cons:
		+ Can be slower due to the overhead of parsing and executing regex.
		+ More difficult to read and maintain, especially for simple cases.
2. **String Replacement (replaceAll())**:
	* Pros:
		+ Faster execution speed, since it doesn't involve additional processing or parsing.
		+ Easier to understand and maintain, as the logic is straightforward.
	* Cons:
		+ Limited to only replacing spaces with a single character (`+`).

**Library**
None of the test cases use any external libraries. The benchmark focuses solely on comparing these two basic string replacement methods.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax used in this benchmark. The tests are straightforward and rely on basic string manipulation functions.

**Other Alternatives**

If you were to compare other approaches, some alternatives could include:

1. **Using `String.prototype.replace()` with a callback**: Instead of using the `replace()` method directly, you could use a callback function to perform the replacement.
2. **Using `String.prototype.replace()` with a regex pattern and function**: You could also use a regex pattern as the second argument, along with an optional function to apply to the match.

Here's a brief example of how this might be implemented:
```javascript
const str = "this is it";
str = str.replace(/ /g, (match) => "+");
```
Keep in mind that these alternatives would likely have similar performance characteristics and trade-offs compared to the original `replace()` and `replaceAll()` methods.

In summary, the benchmark provides a simple comparison of two string replacement methods: using regular expressions with the `replace()` method versus using the `replaceAll()` method. This allows users to evaluate which approach is faster and more efficient for their specific use case.

Latest run results:

Run details: (Test run date: 9 months ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser/OS: Chrome 121 on Linux

View result in a separate tab

Test name	Executions per second
replace regex	6036789.0 Ops/sec
replace All	4910933.0 Ops/sec

Related benchmarks:

replaceAll browser vs regex replace (version: 0)

Comparing performance of: replace regex vs replace All

Created: 9 months ago by: Guest

Jump to the latest result

replace regex

replace All

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):