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: 16 days ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser/OS: Chrome 135 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
replace regex global	20553416.0 Ops/sec
replaceAll with string	14823385.0 Ops/sec
replaceAll with regex	13405797.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months 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.

Related benchmarks:

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

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

Created: 3 years ago by: Guest

Jump to the latest result

replace regex global

replaceAll with string

replaceAll with regex

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):