Benchmark: replaceAll vs regex replace for a newLine using html tags larger string

Script Preparation code:

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

Tests:

replace regex
"\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n".replace(/\n/g, "");
replace All
"\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n\nthisasdfasd it asdfasdf\n".replaceAll("\\n", "");

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 one month ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

**Benchmark Definition and Script Preparation Code**

The benchmark is designed to measure the performance difference between two approaches: using regular expressions (`regex`) and replacing strings manually.

The script preparation code defines a custom `replaceAll` method on the `String.prototype`, which overrides the built-in `replace` method. This method takes two arguments, `search` and `replacement`, and returns the result of calling the original `replace` method with a new regular expression.

In essence, this custom method is designed to mimic the behavior of the `replaceAll` method, but uses regular expressions under the hood.

**Html Preparation Code**

There is no HTML preparation code provided in this benchmark. This suggests that the test cases are only concerned with string manipulation and do not require any additional HTML setup or parsing.

**Individual Test Cases**

The two test cases share a common input string containing multiple newlines (`\n`) followed by HTML tags. The differences between the test cases lie in how the replacement is performed:

1. **`replace regex`**: This test case uses regular expressions to replace all occurrences of `\n` with an empty string. The `replace` method is called on a literal string, and the `g` flag at the end of the regular expression ensures that all matches are replaced, not just the first one.
2. **`replace All`**: This test case uses the custom `replaceAll` method defined in the script preparation code to replace all occurrences of `\n` with an empty string.

**Options Compared**

The two test cases compare the performance of:

* Using regular expressions (`regex`) vs.
* Replacing strings manually (`replaceAll`)

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

* **Regular Expressions (Regex)**:
	+ Pros: Efficient, flexible, and widely supported.
	+ Cons: Can be slower than manual replacement for simple cases, and may introduce additional overhead due to parsing and compilation.
* **Manual Replacement (`replaceAll`)**:
	+ Pros: Often faster than regular expressions for simple cases, as it eliminates the need for parsing and compilation.
	+ Cons: May not be as flexible or efficient as regular expressions, especially when dealing with complex patterns.

**Library and Purpose**

The `String.prototype.replaceAll` method is a custom implementation that replaces all occurrences of a specified pattern in a string. Its purpose is to provide a simple alternative to using regular expressions for string replacement tasks.

**Special JS Feature or Syntax**

There is no special JavaScript feature or syntax mentioned in the benchmark, as it focuses solely on string manipulation and performance comparisons.

**Other Alternatives**

If you're interested in exploring other approaches or alternatives, here are a few options:

* **String.prototype.replace**: The built-in `replace` method on the `String.prototype`, which can be used with regular expressions or literal strings.
* **Regular Expression Engine**: Some JavaScript engines, like SpiderMonkey, have optimized regular expression engines that provide improved performance for complex patterns.

Keep in mind that these alternatives may not necessarily outperform the custom `replaceAll` method defined in this benchmark. The choice of approach ultimately depends on your specific use case and requirements.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.36

Browser/OS: Chrome 118 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
replace regex	1201766.8 Ops/sec
replace All	897741.8 Ops/sec

Related benchmarks:

replaceAll vs regex replace for a newLine using html tags larger string (version: 0)

Comparing performance of: replace regex vs replace All

Created: one year 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 one month ago):