Benchmark: ReplaceAll vs Replace with regex

Tests:

Regex
"this is it".replace(/ /g, "+");
Replace All
"this is it".replaceAll(' ', "+");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Regex
Replace All

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36

Browser/OS: Chrome 146 on Windows

View result in a separate tab

Test name	Executions per second
Regex	12174993.0 Ops/sec
Replace All	10747493.0 Ops/sec

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

LLMs can make mistakes. Check important info.

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

The provided benchmark test compares two string replacement approaches: `replace()` with a regular expression (regex) and `replaceAll()` from a custom implementation.

**What is being tested?**

In the first test case, `"this is it".replace(/ /g, "+");`, we're using the built-in `replace()` method of the String object to replace all occurrences of whitespace characters (`/ /g`) with a plus sign (`+`). The regex `/ /g` matches one or more whitespace characters globally (`g` flag).

In the second test case, `"this is it".replaceAll(' ', "+");`, we're using a custom `replaceAll()` method that replaces all occurrences of a specified character (in this case, a space) with another character (a plus sign). This implementation is not part of the standard JavaScript library.

**Options compared**

The two options being compared are:

1. **Built-in `replace()` method**: The built-in `replace()` method uses a regex engine to match and replace strings. It's a widely supported and efficient approach.
2. **Custom `replaceAll()` method**: The custom implementation of `replaceAll()` is not part of the standard JavaScript library, suggesting it might be a bespoke solution for specific use cases.

**Pros and cons**

1. **Built-in `replace()` method**:
	* Pros:
		+ Widely supported across browsers and Node.js environments.
		+ Efficient and optimized by the browser's or engine's regex implementation.
	* Cons:
		+ May not be as customizable as a custom implementation.
2. **Custom `replaceAll()` method**:
	* Pros:
		+ Highly customizable, allowing for more specific replacement logic.
	* Cons:
		+ May not be supported by all browsers or environments, potentially introducing compatibility issues.

**Library usage**

There is no explicit library mentioned in the provided benchmark definition. However, if a custom `replaceAll()` method were to be implemented, it might rely on a library like Lodash (specifically, the `replaceAll()` function from Lodash) for its implementation.

**Special JS feature or syntax**

None are explicitly mentioned in this benchmark.

**Other alternatives**

If you're looking for alternative string replacement methods, consider:

1. **String.prototype.replace() with a callback**: This method takes a callback function as an argument, allowing for more complex replacement logic.
2. **DOM-based string manipulation**: For specific use cases involving HTML or DOM strings, you might prefer to use browser-specific APIs like `document.getElementById().nodeValue`.

Keep in mind that this benchmark is focused on comparing the performance of two specific approaches: built-in `replace()` method and custom `replaceAll()` method. If you're looking for more general string manipulation options, consider exploring other libraries or APIs available in JavaScript.

Related benchmarks:

ReplaceAll vs Replace with regex (version: 0)

Comparing performance of: Regex vs Replace All

Created: 2 years ago by: Guest

Jump to the latest result

Regex

Replace All

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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