Benchmark: replace vs replaceAll regex

Tests:

replace
const test = 'test test test test'; const result = test.replace(/test/g, 'hello');
replaceAll
const test = 'test test test test'; const result = test.replaceAll(/test/g, 'hello');

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 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/113.0

Browser/OS: Firefox 113 on Linux

View result in a separate tab

Test name	Executions per second
replace	5869548.5 Ops/sec
replaceAll	4948280.5 Ops/sec

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

LLMs can make mistakes. Check important info.

I'd be happy to explain the benchmark and its results.

**Benchmark Overview**

The benchmark measures the performance difference between using `String.prototype.replace()` (also known as `replace()`) versus `String.prototype.replaceAll()` in JavaScript. These two 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 a regular expression to match the specified pattern and replaces all occurrences with a replacement string.
2. **`replaceAll()`**: This is not a standard JavaScript method, but rather a part of some third-party libraries (e.g., jQuery). It is similar to `replace()`, but it can also be used as a string method.

**Pros and Cons**

* **`replace()`**:
	+ Pros:
		- Widely supported in most browsers.
		- Can be chained with other methods (e.g., `replace().toUpperCase()`).
		- Less overhead compared to `replaceAll()`.
	+ Cons:
		- Can be less efficient for large strings due to its single-pass approach.
* **`replaceAll()`** (in a library or third-party context):
	+ Pros:
		- Can be more efficient than `replace()` for large strings, as it uses a multi-threaded approach.
	+ Cons:
		- Not supported in all browsers and environments.
		- May have additional overhead due to the library's complexity.

**Library: jQuery**

The `replaceAll()` method is part of the jQuery library. It was introduced in jQuery 1.6.0 as a convenience method for string manipulation. In this benchmark, it is used instead of the standard JavaScript `replace()` method.

**Special JS Feature/Syntax: None**

There are no special JavaScript features or syntaxes being tested in this benchmark.

**Other Considerations**

When choosing between these two methods, consider the following:

* If you need to replace a single pattern, `replace()` is usually sufficient and more efficient.
* If you need to perform multiple replacements with different patterns, using a library like jQuery can be beneficial for performance.
* Always keep in mind that browser support and compatibility may vary when using third-party libraries.

**Alternatives**

If you want to explore other alternatives or have questions about these methods, consider the following:

* For single pattern replacement: `String.prototype.replace()` (standard JavaScript)
* For multiple replacements or string manipulation: Other libraries like jQuery, Lodash, or Underscore.js
* For performance-critical applications: Consider using a dedicated JavaScript engine like V8 (used in Google Chrome) or SpiderMonkey (used in Firefox)

Related benchmarks:

replace vs replaceAll regex (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 2 months ago):