Benchmark: with/without regex

Tests:

with regexp
function getDisplayName(definitionName, checkBundleId = true) { let displayName; const name = definitionName || ''; if (checkBundleId) { const bundleId = getBundleId(definitionName); displayName = name.substring(name.lastIndexOf(':') + 1); } else { displayName = name.substring(name.lastIndexOf(':') + 1); } return displayName; } function getBundleId(definitionName) { const name = definitionName || ''; const matches = name.match(/(.+):/); return (matches && matches.pop()) || ''; } const res = getDisplayName('foo:bar'); console.log(res);
without
function getDisplayName(definitionName, checkBundleId = true) { let displayName; const name = definitionName || ''; if (checkBundleId) { const bundleId = getBundleId(definitionName); displayName = name.substring(name.lastIndexOf(':') + 1); } else { displayName = name.substring(name.lastIndexOf(':') + 1); } return displayName; } function getBundleId(definitionName) { const name = definitionName || ''; const matches = name.split(':')[0]; return matches || ''; } const res = getDisplayName('foo:bar'); console.log(res);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
with regexp
without

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 regexp	242659.7 Ops/sec
without	243238.8 Ops/sec

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

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided benchmark measures the performance difference between using regular expressions (regex) and not using them in JavaScript code. The benchmark is designed to test how much impact regex has on the execution speed of the code.

**Benchmark Definition JSON Explanation**

The benchmark definition json contains two properties: `Name` and `Description`. However, neither of these properties provide any meaningful information about what the benchmark measures or compares.

The `Script Preparation Code` property should contain the JavaScript code that sets up the environment for the benchmark. In this case, it's empty, which is unusual.

The `Html Preparation Code` property also doesn't seem to be relevant in this context.

**Individual Test Cases**

There are two test cases:

1. **"with  regexp"`**
This test case uses regular expressions (regex) in the JavaScript code. The regex pattern `/(.+):/` is used to extract a substring from a string. The `getBundleId` function splits the input string by colon (`:`) and returns the first part.

Pros:

* This approach allows for efficient extraction of specific parts from a string.
* Regex can be more readable and concise than other parsing methods.

Cons:

* Using regex can be slower due to the overhead of compiling and executing regex patterns.
* Regex patterns can become complex and harder to maintain.

2. **"without"`**
This test case does not use regular expressions (regex) in the JavaScript code. Instead, it uses the `split` method to extract a substring from a string.

Pros:

* This approach is likely to be faster than using regex.
* It's often simpler and more straightforward than regex parsing.

Cons:

* It may not be as efficient or scalable for complex parsing tasks.

**Library**

There doesn't seem to be any external library used in this benchmark. However, the `getBundleId` function uses a simple string splitting method (`split(':'')`) which is a built-in JavaScript function.

**Special JS Feature/Syntax**

None of the test cases use special JavaScript features or syntax that are not widely supported.

**Other Alternatives**

If you want to measure the performance impact of using regular expressions in JavaScript, you could also consider using:

* `use-regex`: A polyfill for regex support in older browsers.
* `regex-tester`: A library that provides a simple API for testing regex patterns.
* ` benchmarking libraries` like Benchmark.js or js-benchmark which provide more features and flexibility for benchmarking.

Keep in mind that the choice of alternative will depend on your specific use case and requirements.

Related benchmarks:

with/without regex (version: 0)

Comparing performance of: with regexp vs without

Created: one year ago by: Guest

Jump to the latest result

with regexp

without

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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