Benchmark: ReplaceAll - MeasureThat.net

Script Preparation code:

str = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."

Tests:

replace with regular expression
str.replace(/\ /g, "+");
replaceAll
str.replaceAll(" ", "+");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
replace with regular expression
replaceAll

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser/OS: Chrome 123 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
replace with regular expression	437647.1 Ops/sec
replaceAll	442469.2 Ops/sec

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

LLMs can make mistakes. Check important info.

**Understanding the Benchmark**

The provided JSON represents a JavaScript microbenchmarking test case. The benchmark is designed to measure the performance of two different approaches for replacing all occurrences of a specific character in a string.

**Benchmark Definition**

The benchmark definition consists of three parts:

1. **Script Preparation Code**: This code creates a sample string `str` containing Latin text.
2. **Html Preparation Code**: This field is empty, suggesting that there's no HTML-related preparation needed for this benchmark.
3. **Script**: This script contains two benchmark definitions:
	* The first definition uses the `replace()` method with a regular expression to replace all occurrences of `\ ` (backslash space) with `"`.
	* The second definition uses the `replaceAll()` method (which is not a standard JavaScript method, more on this later) to replace all occurrences of spaces (`" "`) with "+".

**Options Compared**

The benchmark compares the performance of two different approaches:

1. **Regular Expression**: Using the `replace()` method with a regular expression to replace characters.
2. **replaceAll() Method**: Using an undefined (non-standard) JavaScript method called `replaceAll()`.

**Pros and Cons of Each Approach**

**Regular Expression:**

Pros:

* Widely supported by modern browsers
* Can perform complex string replacements
* Flexible syntax

Cons:

* May have performance overhead due to the regular expression engine

**Non-standard `replaceAll()` Method:**

Note that there is no standard JavaScript method called `replaceAll()`. This method seems to be a custom implementation or a typo. Assuming it's a typo, we'll ignore this approach for analysis.

If `replaceAll()` were a real method, its pros and cons would likely be similar to regular expressions:

Pros:

* Simple syntax
* Fast execution (assuming it's implemented efficiently)

Cons:

* Uncommon usage (not part of standard JavaScript)
* May not work consistently across all browsers

**Other Considerations**

1. **Library Usage**: The benchmark doesn't seem to use any external libraries, but it does utilize the `str` variable created in the script preparation code.
2. **Special JS Features/Syntax**: There are no special JavaScript features or syntax used in this benchmark.
3. **Alternative Approaches**:
	* Another approach could be using a simple loop to iterate through the string and replace characters manually.
	* Some modern browsers have built-in methods like `String.prototype.replace()` with support for regular expressions.

In summary, the benchmark tests the performance of two different approaches: regular expression-based replacement and a non-standard `replaceAll()` method (which seems to be a typo). The choice of approach affects performance, simplicity, and compatibility across browsers.

Related benchmarks:

ReplaceAll (version: 0)

Comparing performance of: replace with regular expression vs replaceAll

Created: 4 years ago by: Guest

Jump to the latest result

replace with regular expression

replaceAll

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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