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

Test name	Executions per second
Split Negative	10578672.0 Ops/sec
Split Positive	10588476.0 Ops/sec
Regex Negative	10922088.0 Ops/sec
Regex Positive	11952608.0 Ops/sec
LastIndexOf Negative	13699181.0 Ops/sec
LastIndexOf Positive	13848487.0 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 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.

Related benchmarks:

URI has No Extension (version: 1)

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

Jump 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):