Benchmark: endsWith vs Regex

Tests:

Regex
"this is a test".match("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

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

LLMs can make mistakes. Check important info.

I'll explain the benchmark and its components in detail.

**Benchmark Overview**

The given JSON represents a JavaScript microbenchmark, where users can compare the performance of different approaches to check if a string ends with a specific substring or pattern. The benchmark is defined by two test cases: `endsWith` and `Regex`.

**Options Compared**

The benchmark compares the performance of two options:

1. **endsWith**: This method returns a boolean value indicating whether the original string ends with the specified substring.
2. **Regex**: This approach uses a regular expression (regex) to search for the specified pattern at the end of the string.

**Pros and Cons**

### EndsWith

Pros:

* Simple and straightforward implementation
* Fast execution, as it only requires a single iteration over the string's characters
* Easy to understand and implement

Cons:

* May not work correctly with non-ASCII characters or Unicode strings
* Can be slower than Regex for large strings due to the overhead of the `endsWith` method

### Regex

Pros:

* Flexible and powerful pattern matching capabilities
* Can handle non-ASCII characters and Unicode strings correctly
* Faster execution for large strings, as it can take advantage of optimized regex engines

Cons:

* More complex implementation, which may lead to errors or performance issues if not implemented correctly
* Slower execution compared to `endsWith` due to the overhead of compiling and executing the regex pattern

**Library**

In the provided benchmark, there is no explicit mention of any libraries being used. However, in general, both `endsWith` and Regex methods are built-in JavaScript functions that do not require any external dependencies.

**Special JS Features or Syntax**

There are no special JavaScript features or syntax mentioned in this benchmark. Both test cases use standard JavaScript methods and operators.

**Other Alternatives**

If you need to compare the performance of other string manipulation approaches, here are some alternatives:

* **Substring**: Instead of checking if a string ends with a substring, you can try using the `substring` method to extract a subset of the original string.
* **indexOf**: You can use the `indexOf` method to search for the specified substring within the original string. If the substring is found at the end of the string, it returns the last index of the match.
* **Regular expressions with anchors**: You can modify the regex pattern to include anchor characters (`^` and `$`) to ensure that the match is performed only at the end of the string.

Keep in mind that these alternatives may have different performance characteristics compared to `endsWith` and Regex, depending on the specific use case and requirements.

Latest run results:

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

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_1_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.1.1 Mobile/15E148 Safari/604.1

Browser/OS: Mobile Safari 18 on iOS 18.1.1

View result in a separate tab

Test name	Executions per second
Regex	24859002.0 Ops/sec
endsWith	89946760.0 Ops/sec

Related benchmarks:

endsWith vs Regex (version: 0)

Comparing performance of: Regex vs endsWith

Created: 3 years ago by: Guest

Jump to the latest result

Regex

endsWith

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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