Benchmark: Test with/without regex FINAL

Tests:

with regex
function getDisplayName(definitionName) { const bundleId = getBundleId(definitionName); return name.substring(name.lastIndexOf(':') + 1); } function getBundleId(definitionName) { const matches = definitionName.match(/(.+):/); return (matches && matches.pop()) || ''; } const res = getDisplayName('foo:bar');
with split
function getDisplayName(definitionName) { const bundleId = getBundleId(definitionName); return name.substring(name.lastIndexOf(':') + 1); } function getBundleId(definitionName) { const matches = definitionName.split(':'); return matches[0]|| ''; } const res = getDisplayName('foo:bar');
without both
function getDisplayName(definitionName) { return definitionName.substring(definitionName.lastIndexOf(':') + 1); } const res = getDisplayName('foo:bar');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
with regex
with split
without both

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	2129084.0 Ops/sec
with split	2433694.5 Ops/sec
without both	31541658.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the benchmark and provide an explanation of what's being tested, compared, and their pros and cons.

**Benchmark Overview**

The benchmark is comparing three different approaches to extract the display name from a bundle ID in JavaScript. The test cases are designed to measure the performance difference between using regular expressions (regex), splitting the string, or neither approach.

**Test Cases**

There are three test cases:

1. **"with regex"**: This test case uses a regular expression to extract the display name. The regex pattern `(.+):` matches one or more characters (`.+`) followed by a colon (:). The `matches.pop()` method is used to retrieve the matched value.
2. **"with split"**: This test case uses the `split()` method to split the string at the colon (:) and then takes the first element of the resulting array (`matches[0]`). This approach does not use regex.
3. **"without both"**: This test case simply extracts the display name by taking a substring starting from the last occurrence of the colon (:) + 1.

**Comparison**

The benchmark is comparing the performance of each approach:

* Regex vs Split: Which approach is faster for extracting the display name?
* Regex vs Without Both: How does using regex compare to not using either regex or splitting?
* Without Both vs Split: How do these two approaches compare in terms of performance?

**Pros and Cons**

Here are some pros and cons for each approach:

1. **Regex**:
	* Pros: Can be more precise and flexible for complex patterns.
	* Cons: Can be slower due to the overhead of regular expression execution.
2. **Split**:
	* Pros: Simple, straightforward, and often faster than regex.
	* Cons: May not work as expected if the input string is malformed or has multiple colons.
3. **Without Both**:
	* Pros: Simple, fast, and may be preferred for security reasons (avoiding regex).
	* Cons: May not be precise or flexible for complex patterns.

**Library**

There is no explicit library mentioned in the benchmark definition or test cases. However, if we assume that `getBundleId()` function uses a library like `regex` or `string-parsing`, it might be worth noting that some JavaScript engines (like V8) have built-in support for regular expressions.

**Special JS Feature/Syntax**

The benchmark does not explicitly use any special JavaScript features or syntax, such as ES6 classes, async/await, or Promises. However, the regex pattern `(.+):` uses a feature called "capturing groups" which can be useful in certain situations.

**Alternatives**

Other alternatives for extracting display names from bundle IDs might include:

* Using a library like `bundle-id-parser` (mentioned on MDN Web Docs)
* Implementing a custom parser using a regex or string-splitting approach
* Using a different data structure, such as an object mapping bundle IDs to display names

Keep in mind that these alternatives may have their own pros and cons, and the benchmark results might vary depending on the specific implementation.

Related benchmarks:

Test with/without regex FINAL (version: 0)

Comparing performance of: with regex vs with split vs without both

Created: one year ago by: Guest

Jump to the latest result

with regex

with split

without both

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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