Benchmark: replace vs replaceAll

Tests:

replace
"Just checking some more things".replace(/ /g, "-");
replaceAll
"Just checking some more things".replaceAll(" ", "-");

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: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36

Browser/OS: Chrome 132 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
replace	4353124.0 Ops/sec
replaceAll	5212300.5 Ops/sec

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

LLMs can make mistakes. Check important info.

I'd be happy to explain the provided benchmark and its various components.

**Benchmark Overview**

The benchmark is designed to compare two methods for replacing characters in a string: `replace()` and `replaceAll()`. Both methods are part of the JavaScript String prototype, which provides various string manipulation functions.

**Options Compared**

In this benchmark, we have two options being compared:

1. **`String.prototype.replace()`**: This method replaces one or more occurrences of a pattern with a replacement string.
2. **`String.prototype.replaceAll()`**: This method is not a native JavaScript function; instead, it's often implemented as an alias for `String.prototype.replace()` when the regular expression pattern includes all possible characters (i.e., `g` flag).

**Pros and Cons**

Here are some pros and cons of each approach:

* **`replace()`**:
	+ Pros:
		- Widely supported across browsers and environments.
		- Easy to read and understand, with a simple syntax.
	+ Cons:
		- Can be slower than `replaceAll()` for certain use cases, since it doesn't optimize for all possible character replacements.
* **`replaceAll()`** (or implemented as `replace()`) :
	+ Pros:
		- Can be faster than `replace()` in some cases, especially when replacing all characters.
	+ Cons:
		- Not a native JavaScript function, so it might not work across all browsers and environments.
		- Requires careful implementation to ensure correct behavior.

**Library and Special Features**

In the provided benchmark code, we don't see any libraries being used explicitly. However, `replaceAll()` is often implemented as an alias for `replace()`, which relies on the JavaScript engine's optimization of regular expressions.

No special JavaScript features or syntax are mentioned in this benchmark.

Related benchmarks:

replace vs replaceAll (version: 0)

Comparing performance of: replace vs replaceAll

Created: 5 years ago by: Guest

Jump to the latest result

replace

replaceAll

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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