Benchmark: replace regex global vs replaceAll with string vs replaceAll with regex

Tests:

replace regex global
"010-1234-5678".replace(/-/g, "");
replaceAll with string
"010-1234-5678".replaceAll("-", "");
replaceAll with regex
"010-1234-5678".replaceAll(/-/g, "");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
replace regex global
replaceAll with string
replaceAll with regex

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/138.0.0.0 Safari/537.36

Browser/OS: Chrome 138 on Mac OS X 10.15.7

View result in a separate tab

replace regex global

23.0M/s

replaceAll with string

17.5M/s

replaceAll with regex

15.8M/s

View exact numbers

Test name	Executions per second
✓ replace regex global	22,966,038 Ops/sec
replaceAll with string	17,454,968 Ops/sec
replaceAll with regex	15,848,015 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.

**Benchmark Overview**

The provided benchmark compares three different approaches to replace hyphens in a string:

1. `replace()` method with global flag (`g`) and a regular expression (regex) pattern.
2. `replaceAll()` method with a string replacement value.
3. `replaceAll()` method with a regex pattern.

These alternatives are compared to determine which approach is the most efficient.

**Options Compared**

The three options are:

1. **`replace()` method with global flag (`g`) and a regex pattern**: This approach uses a regular expression to match hyphens globally in the string, replacing them with an empty string.
2. **`replaceAll()` method with a string replacement value**: This approach uses a literal string `-` to replace hyphens.
3. **`replaceAll()` method with a regex pattern**: This approach uses a regular expression pattern `/-/g` to match and replace hyphens.

**Pros and Cons of Each Approach**

1. **`replace()` method with global flag (`g`) and a regex pattern**:
	* Pros: Regular expressions can be more powerful for complex replacements, but they may also introduce overhead due to the complexity.
	* Cons: May have performance issues if not implemented correctly, as it needs to scan the entire string to match the regex pattern.
2. **`replaceAll()` method with a string replacement value**:
	* Pros: Simple and easy to understand, but may lead to slower performance compared to using regular expressions.
	* Cons: Limited flexibility for complex replacements.
3. **`replaceAll()` method with a regex pattern**:
	* Pros: Balances the simplicity of `replace()` with the power of regular expressions.
	* Cons: May still have some overhead due to the complexity of the regex pattern.

**Library and Special JS Features**

The benchmark uses JavaScript's built-in string replacement methods (`replace()` and `replaceAll()`) without any external libraries or special features. There are no notable mentions of libraries, ES6 features, or other special JS syntax in this benchmark.

**Alternative Approaches**

If you're looking for alternative approaches to replace hyphens, here are a few options:

1. **Using a library like Lodash**: If you need more complex replacement logic, a library like Lodash can provide a `string.replace()` method with additional features.
2. **Regular expression alternatives**: You could use alternative regex patterns, such as `/^-+$/g`, to replace one or more hyphens.
3. **Using a custom implementation**: Depending on your specific requirements, you might want to implement a custom string replacement function from scratch.

Keep in mind that the `replace()` and `replaceAll()` methods are designed for simple replacements, so these alternatives might be overkill for such a basic use case.

In summary, this benchmark compares three common approaches to replace hyphens in JavaScript strings: regular expressions with global flags, literal string replacement, and regex pattern replacement. The choice of approach depends on the specific requirements and performance characteristics of your application.

replace regex global vs replaceAll with string vs replaceAll with regex (version: 0) Benchmark.js

Comparing performance of: `replace regex global vs replaceAll with string vs replaceAll with regex`

Created: 4 years ago by: Guest

Go to the latest result

replace regex global

replaceAll with string

replaceAll with regex

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

replace regex global vs replaceAll with string vs replaceAll with regex (version: 0) Benchmark.js

Comparing performance of: replace regex global vs replaceAll with string vs replaceAll with regex

Created: 4 years ago by: Guest

Go to the latest result

replace regex global

replaceAll with string

replaceAll with regex

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Comparing performance of: `replace regex global vs replaceAll with string vs replaceAll with regex`