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startsWith & endsWith vs test
(version: 0)
Comparing performance of:
startsWith & endsWith vs test
Created:
7 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var text = '/* Benchmark name and description */';
Tests:
startsWith & endsWith
if (text.startsWith('/*') && text.endsWith('*/')) { }
test
if (/^\/\*.*\*\/$/.test(text)) { }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
startsWith & endsWith
test
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to explain the JavaScript microbenchmark on MeasureThat.net. **Benchmark Overview** The benchmark is designed to compare two approaches for checking if a string starts with and ends with a specific substring: using the `startsWith()` and `endsWith()` methods (Example 1) versus using a regular expression (`/regex/` pattern). The test aims to measure which approach is faster in JavaScript. **Options Compared** The benchmark compares the following options: 1. **Using `startsWith()` and `endsWith()` methods**: This method uses the built-in `startsWith()` and `endsWith()` methods of the String prototype, which check if a string starts with or ends with a specific substring, respectively. 2. **Using a regular expression (`/regex/` pattern)**: This method uses a regular expression to match the start and end patterns. **Pros and Cons** Here are some pros and cons for each approach: * Using `startsWith()` and `endsWith() methods`: + Pros: More readable, easier to understand, and more efficient (since these methods are implemented in native code). + Cons: Not all browsers support these methods, and their performance may vary. * Using a regular expression (`/regex/` pattern): + Pros: More versatile, can be used with any language, and works in older browsers that don't support `startsWith()` and `endsWith()`. + Cons: Less readable, more complex to write and maintain, and slower (since the regex engine has overhead). **Library Used** In this benchmark, no specific library is mentioned. However, some libraries like RegEx.js or regex-string can be used for regular expression matching. **Special JavaScript Features/Syntax** No special JavaScript features or syntax are being tested in this benchmark. Both approaches use standard JavaScript syntax and methods. **Other Alternatives** Other alternatives to compare might include: * Using `String.prototype.match()` with a specific pattern. * Using `RegExp.test()` with a specific pattern. * Using a third-party library like `regex-string` for regular expression matching. It's worth noting that the choice of approach depends on the specific use case and requirements. If readability and maintainability are crucial, using `startsWith()` and `endsWith() methods` might be a better option. However, if versatility and performance are more important, using a regular expression (`/regex/` pattern) might be a better fit. **Benchmark Preparation Code** The benchmark preparation code is: ```javascript var text = '/* Benchmark name and description */'; ``` This creates a simple string variable `text` that will be used as the input for the benchmarks. The actual content of the variable is left blank to allow users to modify it. **Individual Test Cases** There are two test cases: 1. "startsWith & endsWith" * Benchmark Definition: `if (text.startsWith('/*') && text.endsWith('*/')) { }` 2. "test" * Benchmark Definition: `if (/^\\/\\*.*\\*\\/$/.test(text)) { }` These test cases simply check if the input string `text` starts with and ends with a specific substring (`'/*'` and `'*/'`, respectively). **Latest Benchmark Results** The latest benchmark results show that: * "startsWith & endsWith" is faster (with 226,736,560 executions per second). * "test" is slower (with 209,835,000 executions per second).
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