Benchmark: replaceAll vs replace regexp

Tests:

replace
"hola qué tal hola".replace(/hola/g, 'hey');
replaceAll
"hola qué tal hola".replaceAll('hola', 'hey');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
replace
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/104.0.0.0 Safari/537.36

Browser/OS: Chrome 104 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
replace	1178790.2 Ops/sec
replaceAll	6712979.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 7 months ago):

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the provided benchmark.

**What is tested?**

The benchmark tests two approaches to replace or remove a specific string from a given string:

1. **Replace**: Using the `replace()` method with a regular expression (`/hola/g`).
2. **ReplaceAll**: Using the `replaceAll()` method (which is not a standard JavaScript method, but rather a custom implementation).

**Options compared**

The two approaches being tested are:

* `replace()`: This is a built-in JavaScript method that replaces all occurrences of a specified string with another string.
* `replaceAll()`: This is a custom implementation, likely using the `replace()` method with the `g` flag (global match) to achieve the same result.

**Pros and Cons**

**Replace (`/hola/g`)**

Pros:

* Built-in JavaScript method, widely supported across browsers.
* Easy to implement.
* Fast execution speed.

Cons:

* May not be suitable for cases where you want to remove only a specific instance of a string (not all occurrences).
* May have performance issues with very long strings or complex regular expressions.

**ReplaceAll (`replaceAll()`)**

Pros:

* Allows for more control over the replacement process (e.g., specifying multiple strings to replace).
* Can be faster than `replace()` in certain cases, especially when dealing with large strings.

Cons:

* Custom implementation, which may not be as widely supported across browsers.
* May require additional code to implement correctly.

**Other considerations**

* The benchmark is comparing the two approaches on a specific string: `"hola qué tal hola"`.
* The `g` flag in the regular expression (`/hola/g`) ensures that all occurrences of "hola" are replaced, not just the first one.
* The `replaceAll()` method implementation is not provided, so it's unclear how it differs from the standard `replace()` method.

**Library/Custom implementation**

The `replaceAll()` method implementation is likely custom, as it's not a standard JavaScript method. This suggests that the benchmark creator wanted to test a specific approach or library that provides this functionality.

If you're interested in exploring alternatives, here are some options:

* Use other string replacement methods, such as `String.prototype.replace()` with a callback function.
* Explore third-party libraries that provide implementation for `replaceAll()`, such as regex engines like RegEx.js.
* Implement your own custom replacement method using JavaScript's built-in String and RegExp APIs.

Let me know if you have any further questions or need more clarification!

Related benchmarks:

replaceAll vs replace regexp (version: 0)

Comparing performance of: replace vs replaceAll

Created: 2 years ago by: Guest

Jump to the latest result

replace

replaceAll

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 7 months ago):