Benchmark: replaceAll vs regex replace (no prep code)

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 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser/OS: Chrome 129 on Windows

View result in a separate tab

Test name	Executions per second
replace regex	6892097.0 Ops/sec
replace All	6105952.5 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 definition and test cases to understand what is being tested.

**Benchmark Definition**

The benchmark definition is a simple JavaScript expression that uses two different methods to replace all occurrences of whitespace characters (` `) with a plus sign (`+`). The two methods are:

1. `replace()` method, which is part of the String prototype in JavaScript.
2. `replaceAll()` method (also known as `replaceAll()`), which is not a standard method in JavaScript but might be provided by some libraries or frameworks.

**Options Compared**

The benchmark compares the performance of these two methods:

* `replace()` method
* `replaceAll()` method

**Pros and Cons**

1. **`replace()` method**:
	* Pros: widely supported, efficient, and relatively simple to implement.
	* Cons: might not be as fast as specialized methods like `replaceAll()`, especially for large inputs.
2. **`replaceAll()` method**:
	* Pros: potentially faster than the `replace()` method, especially for regular expressions with complex patterns.
	* Cons: not a standard method in JavaScript, which means it might not be supported by all browsers or environments.

Other considerations:

* The benchmark does not compare the performance of using regular expressions versus string replacement methods. This could provide additional insights into the trade-offs between these approaches.
* The benchmark does not account for potential overheads like parsing, compiling, or caching that might affect the performance of these methods.

**Library and Special JS Features**

The `replaceAll()` method is likely provided by a library or framework that extends or supplements the standard JavaScript API. This could be a third-party library, a custom implementation, or even a browser extension.

If you're interested in using this method, you might need to include additional dependencies or scripts in your project.

**Test Case**

The test case uses a simple string literal `"this is it"`. The replacement operation will remove all whitespace characters from the string, leaving only the content `"it"`.

In summary, this benchmark tests the performance difference between two methods for replacing all occurrences of whitespace characters with a plus sign: the standard `replace()` method and a potentially faster but non-standard `replaceAll()` method.

Related benchmarks:

replaceAll vs regex replace (no prep code) (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):