Benchmark: Filename and extension

Script Preparation code:

var filename = "file.name.png";

Tests:

slice
var a = filename.slice(0, filename.lastIndexOf('.')); var b = filename.slice(filename.lastIndexOf('.'));
substr
var a = filename.substr(0, filename.lastIndexOf('.')); var b = filename.substr(filename.lastIndexOf('.'));
substring
var a = filename.substring(0, filename.lastIndexOf('.')); var b = filename.substring(filename.lastIndexOf('.'));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice
substr
substring

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

MeasuringThat.net is an online platform that allows users to create and run JavaScript microbenchmarks. The provided JSON data represents a benchmark test case for comparing the performance of three different string manipulation methods: `slice`, `substr`, and `substring`.

**What is being tested?**

The benchmark tests which string manipulation method (`.slice()`, `.substr()`, or `.substring()`) is faster when extracting a part of a file name. Specifically, it extracts the part before the last occurrence of the dot (`.`) separator.

**Options compared:**

The three options are:

1. `.slice()`: Extracts the part before the last occurrence of the dot (`.`) separator.
2. `.substr()`: Extracts a specified number of characters from the start or end of a string.
3. `.substring()`: Extracts a part of a string, starting from a specified beginning index and ending at a specified end index.

**Pros and cons of each approach:**

1. `.slice()`:
	* Pros: Efficient, as it uses a single method call to extract the desired substring.
	* Cons: May have additional overhead due to the use of an array slice operation (e.g., `filename.slice(0, filename.lastIndexOf('.'))`).
2. `.substr()`: Not recommended for this specific use case, as it's generally slower than `.slice()` and requires specifying the end index.
3. `.substring()`: Also not ideal, as it has additional overhead due to the use of two method calls (e.g., `filename.substring(0, filename.lastIndexOf('.'))`).

**Library:**

None is explicitly mentioned in the provided JSON data.

**Special JS feature or syntax:**

The benchmark uses a specific JavaScript syntax for file names with extensions (e.g., `"file.name.png"`). This syntax is not unique to MeasuringThat.net and can be used in any JavaScript environment that supports it.

**Other considerations:**

The benchmark does not account for variations in file name formats, such as:

* File names without extensions
* File names with multiple dot (`.`) separators
* Non-English characters

These variations may affect the performance of each string manipulation method.

**Alternatives:**

For similar benchmarks, you can use other online platforms that offer JavaScript benchmarking capabilities, such as:

* jsperf.com (now defunct)
* jsbench.net
* codepen.io (with the "JSPerf" extension)

Alternatively, you can create and run your own local JavaScript benchmark using a tool like `benchmark.js` or `js-benchmark`.

Related benchmarks:

Filename and extension (version: 0)

Comparing performance of: slice vs substr vs substring

Created: 7 years ago by: Guest

Jump to the latest result

slice

substr

substring

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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