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teteteteteeetet
(version: 0)
Comparing performance of:
indexOf vs regex
Created:
6 years ago
by:
Guest
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Script Preparation code:
var str = "fjhdasfkjldhsfjkashdfjkdshffffflkgjdflkgsjkgfjkghsdfkljghdfkljsgdkf";
Tests:
indexOf
for(var i = 0;i<100000;i++){ var a = str.indexOf("fff"); }
regex
for(var i = 0;i<100000;i++){ var a = /fff/i.test(str); }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
indexOf
regex
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'll break down the provided benchmark and explain what's being tested, compared, and their pros and cons. **Benchmark Overview** The provided JSON represents two test cases: `indexOf` and `regex`. Both tests aim to measure the performance of JavaScript code that searches for a specific substring within a large string. The string used in both tests is a long, randomly generated string containing the target substring "fff". **Options Compared** In this benchmark, two approaches are compared: 1. **String.indexOf()**: This method returns the index of the first occurrence of the specified value (in this case, "fff") within the string. 2. **Regular Expression (`/fff/i.test(str)`)**: This method uses a regular expression to search for the target substring within the string. **Pros and Cons** 1. **String.indexOf()** * Pros: + Simple and straightforward to implement. + Fast, as it only needs to traverse the string once to find the first occurrence. * Cons: + Can be slow if the target substring is not found, as it will traverse the entire string. 2. **Regular Expression (`/fff/i.test(str)`)** * Pros: + More flexible and powerful than `indexOf()`, as it can search for multiple patterns and supports regular expression syntax. + Can be faster if the target substring is not found, as it will stop searching once it reaches the end of the string. * Cons: + Can be slower due to the overhead of compiling and executing the regular expression. + More complex to implement correctly. **Library Usage** None of the test cases explicitly use a library, but `String.indexOf()` is part of the JavaScript standard library. The regular expression syntax used in the `regex` test case is also part of the JavaScript standard library. **Special JS Feature or Syntax** The benchmark uses the `/fff/i.test(str)` syntax, which utilizes JavaScript's built-in support for regular expressions with the `i` flag (case-insensitive search). This feature allows for efficient and flexible substring searching in JavaScript strings. **Other Alternatives** Alternative approaches to these two methods include: * Using a different algorithm or data structure, such as a hash table or trie. * Utilizing native library functions specific to the target platform (e.g., `strchr()` on Linux). * Employing parallel processing or concurrent execution to speed up the search. * Using a third-party library optimized for string searching and regular expressions. Keep in mind that these alternatives may introduce additional complexity, dependencies, or performance overhead.
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