Benchmark: endsWith vs Regex test

Tests:

Regex
/test$/.test("this is a test")
endsWith
"this is a test".endsWith("test")

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Regex
endsWith

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 124 on Android

View result in a separate tab

Test name	Executions per second
Regex	33582428.0 Ops/sec
endsWith	74671688.0 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The benchmark is comparing two approaches to check if a string ends with a certain suffix:

1. Using a regular expression (`/test$/`).
2. Using the `endsWith()` method of the String object (`"this is a test".endsWith("test")`).

**Options Compared**

In this benchmark, we have two options being compared:

* **Regex**: Using a regular expression to match the suffix at the end of the string.
* **endsWith**: Using the `endsWith()` method of the String object.

**Pros and Cons of Each Approach**

Here are some pros and cons of each approach:

* **Regex**
	+ Pros:
		- Can be used to match any suffix, not just a specific one.
		- Can be more flexible than the `endsWith()` method.
	+ Cons:
		- Can be slower than the `endsWith()` method for simple cases.
		- Requires additional code and complexity.
* **endsWith**
	+ Pros:
		- Faster and more straightforward than using a regular expression.
		- Only requires a single call to the `endsWith()` method.
	+ Cons:
		- Limited to only checking for a specific suffix ("test" in this case).
		- May not be as flexible as the regex approach.

**Library and Special JS Features**

In this benchmark, we're using the `endsWith()` method of the String object. This is a built-in JavaScript method that was introduced in ECMAScript 2015 (ES6).

No special JavaScript features or syntax are being tested in this benchmark.

**Other Alternatives**

Other alternatives to using regular expressions or the `endsWith()` method could include:

* Using a library like Lodash's `endsWith` function.
* Implementing a custom string matching algorithm.

However, in this simple benchmark, the two options (regex and `endsWith`) are the most straightforward and well-supported approaches.

**Benchmark Preparation Code**

The script preparation code is empty, which means that no additional setup or initialization code is required before running the benchmark.

Related benchmarks:

endsWith vs Regex test (version: 0)

Comparing performance of: Regex vs endsWith

Created: one year ago by: Guest

Jump to the latest result

Regex

endsWith

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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