Benchmark: FINAL2 test with regex/with split/without both

Tests:

with regex
function getBundleId(definitionName) { const matches = definitionName.match(/(.+):/); return (matches && matches.pop()) || ''; } const res = getBundleId('foo:bar:baz');
with split
function getBundleId(definitionName) { const lastIndex = definitionName.lastIndexOf(':'); return lastIndex !== -1 ? definitionName.slice(0, lastIndex) : ''; } const res = getBundleId('foo:bar:baz');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
with regex
with split

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36

Browser/OS: Chrome 127 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
with regex	12573512.0 Ops/sec
with split	30066476.0 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 provided benchmarking setup and explain what's being tested.

**Benchmark Setup**

The test consists of two individual test cases, each with its own benchmark definition. The benchmark definitions are functions that are executed multiple times to measure their performance. The main difference between the two test cases is how they extract a value from a string.

**Test Case 1: "with regex"**

```javascript
function getBundleId(definitionName) {
    const matches = definitionName.match(/(.+):/);
    return (matches && matches.pop()) || '';
}
```

This function uses a regular expression (`regex`) to match the first group of characters in the `definitionName` string. The `(.)` part matches any character, and the `:` at the end of the pattern matches a colon.

**Test Case 2: "with split"**

```javascript
function getBundleId(definitionName) {
    const lastIndex = definitionName.lastIndexOf(':');
    return lastIndex !== -1 ? definitionName.slice(0, lastIndex) : '';
}
```

This function uses the `lastIndexOf` method to find the last index of a colon (`:`) in the `definitionName` string. If a colon is found, it returns the substring up to that point using `slice`. Otherwise, it returns an empty string.

**Comparison of Options**

There are two main approaches being compared: using regular expressions and using the `split` method.

* **Regular Expressions (`regex`):**
	+ Pros:
		- Can match complex patterns with a high degree of precision.
		- Can be used to extract data from strings in various formats.
	+ Cons:
		- Can be slower than other methods, especially for large strings.
		- May require additional overhead due to the parsing and compilation process.
* **Split Method:**
	+ Pros:
		- Generally faster than regular expressions.
		- Simpler and more straightforward implementation.
	+ Cons:
		- Limited to extracting data based on a specific delimiter (`:` in this case).
		- May not work as expected if the delimiter is part of the data being extracted.

**Other Considerations**

* **JavaScript Features:** Neither test case uses any special JavaScript features or syntax beyond what's standard.
* **Libraries:** None are explicitly mentioned, but it's possible that other libraries might be used in the actual implementation (e.g., a library for regular expression matching).

**Alternatives**

If you wanted to compare these approaches with additional methods, some alternatives could include:

* Using `String.prototype.indexOf()` and `String.prototype.substring()` instead of `lastIndexOf` and `slice`.
* Using `regex` with the `exec` method instead of `match`.
* Using a different delimiter or format for extracting data.
* Comparing performance with other string manipulation methods, such as `replace` or `indexOf`.

Keep in mind that these alternatives might change the nature of the comparison, so it's essential to adapt the benchmark setup and test cases accordingly.

Related benchmarks:

FINAL2 test with regex/with split/without both (version: 0)

Comparing performance of: with regex vs with split

Created: one year ago by: Guest

Jump to the latest result

with regex

with split

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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