Benchmark: replaceAll vs replace 508

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
regex
benchmark

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Description**

The provided benchmark measures the performance difference between two string replacement methods: `replace()` and `replaceAll()`. These methods are used to replace occurrences of a pattern in a string.

**Options Compared**

There are only two options being compared:

1. **`replace()`**: This method uses regular expressions (regex) to find and replace patterns in a string. It returns the modified string.
2. **`replaceAll()`**: This method is not a standard JavaScript method, but rather a proprietary method used by some JavaScript engines, including Firefox. It's similar to `replace()`, but with an additional option for case sensitivity.

**Pros and Cons**

* `replace()`:
	+ Pros: widely supported across most JavaScript engines, efficient, and concise.
	+ Cons: may not be as readable or maintainable due to the use of regex patterns.
* `replaceAll()`:
	+ Pros: faster performance in some cases (as seen in the benchmark result), possibly useful for specific use cases.
	+ Cons: non-standard method, may not work across all JavaScript engines, and its behavior can vary depending on the engine implementation.

**Library and Syntax**

Neither of these methods uses a library. Instead, they are built-in string manipulation functions in JavaScript.

**Special JS Feature or Syntax**

The `replaceAll()` method is not a standard JavaScript method, but rather a proprietary method used by some JavaScript engines, including Firefox. This means that while it may be supported by some browsers, it's not guaranteed to work across all platforms and versions.

**Benchmark Preparation Code**

The provided script preparation code for the benchmark is simply:

```javascript
this is it.replace(/ /g, "+");
```

This code defines a string `this is it` and replaces each space character (`\s`) with a plus sign (`+`). The `/ /g` regex pattern matches one or more whitespace characters globally.

**Individual Test Cases**

The benchmark has two test cases:

1. **`regex`**: This test case runs the script preparation code using the `replace()` method.
2. **`benchmark`**: This test case runs the same script preparation code, but uses the proprietary `replaceAll()` method.

**Latest Benchmark Result**

The latest benchmark result shows that Firefox 109 performs better with the `replaceAll()` method, executing approximately 43% more times per second than the `replace()` method on a Desktop with Linux operating system.

Latest run results:

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

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/109.0

Browser/OS: Firefox 109 on Linux

View result in a separate tab

Test name	Executions per second
regex	10435667.0 Ops/sec
benchmark	14746466.0 Ops/sec

Related benchmarks:

replaceAll vs replace 508 (version: 0)

Comparing performance of: regex vs benchmark

Created: one year ago by: Guest

Jump to the latest result

regex

benchmark

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):