Benchmark: RegEx.test vs. String.includes 3

Script Preparation code:

var string = "Hello world!";
var regex = /hello/gi;

Tests:

RegEx.test
regex.test(string);
String.includes
string.toLowerCase().includes(("Hello").toLowerCase());

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
RegEx.test
String.includes

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser/OS: Chrome 120 on Linux

View result in a separate tab

Test name	Executions per second
RegEx.test	5170867.5 Ops/sec
String.includes	14014126.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down what's being tested in the provided JSON benchmark.

The benchmark is comparing two approaches to test if the string "Hello" is present anywhere in another given string:

1. **RegExp.test() method**: This method uses regular expressions (regex) to search for a pattern in a string. The regex `/hello/gi` is used, which:
	* `h` and `e` and `l` are literal characters.
	* `g` flag makes the search global, meaning it will find all occurrences of the pattern, not just the first one.
	* `i` flag makes the search case-insensitive.
2. **String.includes() method**: This method checks if a specified value (in this case, the lowercased string "Hello") is present anywhere in the original string.

**Comparison Options**

The benchmark compares these two approaches:

1. **RegExp.test() method**: This approach uses a regex pattern to search for the target string.
2. **String.includes() method**: This approach converts the target string to lowercase and then checks if it's present in the original string.

**Pros and Cons of Each Approach:**

1. **RegExp.test() method**:
	* Pros:
		+ More flexible, as regex patterns can be complex and powerful.
		+ Can handle multiple matches, not just the first one.
	* Cons:
		+ Can be slower for simple string searches due to the overhead of creating a regex pattern.
2. **String.includes() method**:
	* Pros:
		+ Faster for simple string searches since it uses a built-in implementation.
		+ More intuitive, as it's a standard JavaScript method.
	* Cons:
		+ Less flexible, as it only works with exact matches (case-sensitive).
		+ Requires converting the target string to lowercase, which can be unnecessary if case-insensitivity is not required.

**Library and Purpose:**

There are no libraries used in this benchmark. Both methods rely on built-in JavaScript functionality.

**Special JS Feature or Syntax:**

None mentioned.

**Other Alternatives:**

For simple string searches, other approaches could include:

1. **String.indexOf() method**: Similar to String.includes(), but returns the index of the first match instead of a boolean value.
2. **String.match() method**: Returns an array of matches if the target pattern is found anywhere in the string.

These alternatives may offer different trade-offs between performance, flexibility, and readability, depending on the specific use case.

The benchmark can be useful for developers to compare the performance of these approaches and choose the best fit for their project's requirements.

Related benchmarks:

RegEx.test vs. String.includes 3 (version: 0)

Comparing performance of: RegEx.test vs String.includes

Created: 2 years ago by: Guest

Jump to the latest result

RegEx.test

String.includes

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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