Benchmark: test test - MeasureThat.net

Script Preparation code:

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

Tests:

1RegEx.test
regex.test(string);
string.includes("Hello");
string.toLowerCase().includes("Hello".toLowerCase());

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
1RegEx.test
string.includes("Hello");

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/106.0.0.0 Safari/537.36

Browser/OS: Chrome 106 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
1RegEx.test	6865571.0 Ops/sec
string.includes("Hello");	16450088.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what's being tested, compared, and analyzed.

**Benchmark Overview**

The benchmark measures the performance of JavaScript microbenchmarks on various platforms and browsers. It tests two different approaches for searching for a substring in a string: using a regular expression (`1RegEx.test`) and using the `includes()` method with toLowerCase().

**Test Case 1: Regex.test**

* **Purpose:** Tests the performance of regular expressions (regex) in JavaScript.
* **Library:** The built-in JavaScript `RegExp` library is used.
* **Purpose of RegExp:** Regular expressions are a powerful way to search, validate, and manipulate text patterns in strings. They provide more advanced features than simple substring matching, such as support for character classes, quantifiers, and flags.

**Test Case 2: string.includes() with toLowerCase()**

* **Purpose:** Tests the performance of using the `includes()` method on a string after calling `toLowerCase()` on it.
* **Library:** The built-in JavaScript `String.prototype.toLowerCase()` method is used, which converts a string to lowercase.
* **Pros and Cons:**
	+ Pros:
		- Faster than regex for simple substring matching.
		- More readable and intuitive than regex.
	+ Cons:
		- Less flexible and powerful than regex.
		- Requires additional call to `toLowerCase()`.

**Comparison**

The benchmark compares the performance of these two approaches:

* **Regex**: Tests the regular expression engine's performance when executing the regex pattern (`/Hello/") on a string containing the substring "Hello".
* **includes() with toLowerCase()**: Tests the performance of calling `toLowerCase()` on the input string and then using the `includes()` method to search for the substring.

**Pros and Cons**

Both approaches have pros and cons:

* **Regex**:
	+ Pros: More flexible and powerful than simple substring matching.
	+ Cons: Can be slower due to the complexity of regex engines.
* **includes() with toLowerCase()**:
	+ Pros: Faster and more readable for simple substring matching.
	+ Cons: Requires additional call to `toLowerCase()`.

**Other Considerations**

The benchmark also considers:

* **Browser**: The test is run on Chrome 106, which may not be representative of other browsers or versions.
* **Device Platform**: The test is run on a desktop platform, which may have different performance characteristics than mobile platforms.
* **Operating System**: The test is run on Mac OS X 10.15.7, which may have specific optimizations or limitations that affect performance.

**Alternatives**

Other alternatives for substring matching in JavaScript include:

* Using the `indexOf()` method instead of `includes()`
* Using a library like Splat.js or String-Promise for more advanced string manipulation
* Using a different programming language or framework for tasks outside of JavaScript

Keep in mind that this is just a brief overview, and there are many nuances and subtleties to each approach.

Related benchmarks:

test test (version: 0)

test

Comparing performance of: 1RegEx.test vs string.includes("Hello");

Created: 2 years ago by: Guest

Jump to the latest result

1RegEx.test

string.includes("Hello");

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):