Benchmark: URI has No Extension

Script Preparation code:

function checkExtensionUsingSplit(uri) {
    var lastSegment = uri.split('/').pop();
    return lastSegment && lastSegment.indexOf('.') == -1;
}

function checkExtensionUsingRegex(uri) {
    return !/\.[^./]+$/.test(uri);
}

function checkExtensionUsingLastIndexOf(uri) {
    return uri.indexOf('.', uri.lastIndexOf('/')) == -1;
}

Tests:

Split Negative
checkExtensionUsingSplit('/example/path/filename.pdf');
Split Positive
checkExtensionUsingSplit('/example/path/filename');
Regex Negative
checkExtensionUsingRegex('/example/path/filename.pdf');
Regex Positive
checkExtensionUsingRegex('/example/path/filename');
LastIndexOf Negative
checkExtensionUsingLastIndexOf('/example/path/filename.pdf');
LastIndexOf Positive
checkExtensionUsingLastIndexOf('/example/path/filename');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Split Negative
Split Positive
Regex Negative
Regex Positive
LastIndexOf Negative
LastIndexOf Positive

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/120.0.0.0 Safari/537.36

Browser/OS: Chrome 120 on Mac OS X 10.15.7

View result in a separate tab

LastIndexOf Positive

13.8M/s

LastIndexOf Negative

13.7M/s

Regex Positive

12.0M/s

Regex Negative

10.9M/s

Split Positive

10.6M/s

Split Negative

10.6M/s

View exact numbers

Test name	Executions per second
✓ LastIndexOf Positive	13,848,487 Ops/sec
LastIndexOf Negative	13,699,181 Ops/sec
Regex Positive	11,952,608 Ops/sec
Regex Negative	10,922,088 Ops/sec
Split Positive	10,588,476 Ops/sec
Split Negative	10,578,672 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 its various components.

**Benchmark Definition**

The provided JSON defines a JavaScript microbenchmark that tests whether or not a URI (Uniform Resource Identifier) has a file extension. The test is repeated six times with different input URIs, using three distinct approaches: `checkExtensionUsingSplit`, `checkExtensionUsingRegex`, and `checkExtensionUsingLastIndexOf`.

**Options Compared**

The three options compared are:

1. **`checkExtensionUsingSplit`**: This approach uses the `split()` method to split the URI into segments and then checks if the last segment has an index of `-1` in the `indexOf()` method, indicating no extension.
2. **`checkExtensionUsingRegex`**: This approach uses a regular expression (`/.[^./]+$`) to match any character (except `/`, `.`, or `/`) after the last segment, effectively checking for an extension.
3. **`checkExtensionUsingLastIndexOf`**: This approach uses the `lastIndexOf()` method to find the index of the last `/` in the URI and then checks if the next character is a dot (`.`), indicating no extension.

**Pros and Cons**

1. **`checkExtensionUsingSplit`**:
	* Pros: Simple, easy to read, and maintain.
	* Cons: Can be slow due to the string splitting process.
2. **`checkExtensionUsingRegex`**:
	* Pros: Fast and efficient, as it uses a compiled regular expression.
	* Cons: May not work correctly with non-standard URIs or edge cases.
3. **`checkExtensionUsingLastIndexOf`**:
	* Pros: Efficient, as it uses the `lastIndexOf()` method, which is generally faster than `indexOf()`.
	* Cons: Less readable and maintainable due to its complex logic.

**Libraries**

None of the options use a dedicated library for this specific task. However, if you were to extend this benchmark to include more features or optimizations, libraries like `lodash` or `regex-escape` could be useful.

**Special JS Features or Syntax**

This benchmark does not explicitly utilize any special JavaScript features or syntax, such as async/await, generators, or modern ES6+ features. It relies on standard JavaScript functions and methods for its comparisons.

**Other Alternatives**

If you wanted to test alternative approaches or variations of these options, you could consider the following:

* Using other regular expression patterns or techniques.
* Incorporating caching or memoization to optimize performance.
* Implementing a more efficient algorithm using bitwise operations or other low-level optimizations.
* Comparing with other programming languages or runtimes.

Keep in mind that adding too many variations or alternatives can make the benchmark less focused and more challenging to analyze.

URI has No Extension (version: 1) Benchmark.js

Tests whether or not a URI has a file extension

Comparing performance of: `Split Negative vs Split Positive vs Regex Negative vs Regex Positive vs LastIndexOf Negative vs LastIndexOf Positive`

Created: 2 years ago by: Registered User

Go to the latest result

Split Negative

Split Positive

Regex Negative

Regex Positive

LastIndexOf Negative

LastIndexOf Positive

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

URI has No Extension (version: 1) Benchmark.js

Tests whether or not a URI has a file extension

Comparing performance of: Split Negative vs Split Positive vs Regex Negative vs Regex Positive vs LastIndexOf Negative vs LastIndexOf Positive

Created: 2 years ago by: Registered User

Go to the latest result

Split Negative

Split Positive

Regex Negative

Regex Positive

LastIndexOf Negative

LastIndexOf Positive

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

Comparing performance of: `Split Negative vs Split Positive vs Regex Negative vs Regex Positive vs LastIndexOf Negative vs LastIndexOf Positive`