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regexs vs. loop
(version: 0)
Comparing performance of:
regexs vs loop
Created:
3 years ago
by:
Guest
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HTML Preparation code:
var host = 'api-staging.eurostar.com';
Script Preparation code:
var host = 'api-staging.eurostar.com';
Tests:
regexs
const allowedRedirectHostsRegExp = new RegExp('eurostar.com|localhost', 'i'); allowedRedirectHostsRegExp.test(host);
loop
['eurostar.com', 'localhost'].includes(host);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
regexs
loop
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON benchmark data. **Benchmark Definition** The website measures the performance of two different approaches to check if a URL is allowed for redirect: 1. **Regex approach**: `const allowedRedirectHostsRegExp = new RegExp('eurostar.com|localhost', 'i');\r\nallowedRedirectHostsRegExp.test(host);` 2. **Loop approach**: `['eurostar.com', 'localhost'].includes(host)` **Options Compared** The benchmark compares the performance of these two approaches: * Regex approach: Using a regular expression to match the allowed hosts. * Loop approach: Checking if the host is in an array of allowed hosts using the `includes()` method. **Pros and Cons** **Regex Approach:** Pros: * More concise and expressive * Can be easily extended to support more complex rules Cons: * May be slower due to the overhead of compiling regular expressions * Can be less readable for developers without experience with regex patterns **Loop Approach:** Pros: * Typically faster since it avoids the overhead of compiling regular expressions * More readable for developers without experience with regex patterns Cons: * Less concise and more verbose than the regex approach * May require additional maintenance to add or remove allowed hosts from the array. **Library Used** In both test cases, no specific library is used. However, it's worth noting that if you were to use a library like `lodash` in the loop approach, it could simplify the code and make it more readable: `_.includes(['eurostar.com', 'localhost'], host)` **Special JS Feature or Syntax** There are no special JavaScript features or syntax used in this benchmark. The test cases only use basic JavaScript concepts. **Other Alternatives** If you wanted to add additional approaches to the benchmark, here are some alternatives: * Using a `switch` statement: `switch (host) { case 'eurostar.com': // ... case 'localhost': // ... }` * Using a `switch` statement with regular expressions: `switch (allowedRedirectHostsRegExp.test(host)) { case true: // ... }` * Using a more modern approach like template literals or destructuring: `const [host1, host2] = ['eurostar.com', 'localhost']; if (host === host1 || host === host2) { // ... }` Keep in mind that these alternatives may not be as straightforward or readable as the original loop approach.
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