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bench hubble .startsWith() vs .test() vs .match() vs .indexOf()
(version: 0)
Comparing performance of:
regexp .test() vs string .match() vs indexOf === 0 vs string .startsWith()
Created:
3 years ago
by:
Registered User
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Script Preparation code:
var fullMessage = "Temos um convite especial pra você! Seu perfil foi notado por nossa empresa e por esse motivo te convidamos a fazer um teste. link. Dica da Catho: 1. Fazer o teste não é obrigatório, mas pode te colocar na frente de vários candidatos no seu processo. Se você não curtir sua nota, poderá deixá-la oculta e cabe ao recrutador entender se segue ou não com o teu processo mesmo assim, ok? 2. Aguarde o contato do recrutador até que saia o resultado do seu teste. Boa sorte!";
Tests:
regexp .test()
/^Temos um convite especial pra você\! Seu perfil foi notado por nossa empresa, e por esse motivo te convidamos a fazer um teste/.test(fullMessage)
string .match()
!!fullMessage.match(/^Temos um convite especial pra você\! Seu perfil foi notado por nossa empresa, e por esse motivo te convidamos a fazer um teste/)
indexOf === 0
fullMessage.indexOf('Temos um convite especial pra você! Seu perfil foi notado por nossa empresa, e por esse motivo te convidamos a fazer um teste') === 0
string .startsWith()
fullMessage.startsWith('Temos um convite especial pra você! Seu perfil foi notado por nossa empresa, e por esse motivo te convidamos a fazer um teste')
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
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Test case name
Result
regexp .test()
string .match()
indexOf === 0
string .startsWith()
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**What is being tested?** On MeasureThat.net, the provided benchmark tests the performance of different string manipulation methods in JavaScript: `startsWith()`, `.test()`, `.match()`, and `.indexOf()`. These methods are used to search for specific patterns or substrings within a given string. The test creates a large sample string (`fullMessage`) containing a predefined pattern and then measures how quickly each method can identify the presence of that pattern. **Options compared:** 1. `startsWith()`: Returns `true` if the string starts with the specified value. 2. `.test(regexp)`: Tests whether the string matches the regular expression provided. 3. `.match(pattern)`: Returns an array of matches for a pattern in a string. 4. `indexOf(substring)`: Returns the index of the first occurrence of the specified substring, or -1 if not found. **Pros and Cons:** * **Performance:** * `.test(regexp)` is generally faster because it avoids creating a new regular expression object each time, as required for `.startsWith()`. * `indexOf(substring)` can be slower due to its use of a linear search algorithm. * **Readability and maintainability:** * Using `.test(regexp)` ensures the pattern is treated exactly as intended, making it easier to debug complex patterns. * With `.startsWith()`, the value being searched for must start with the specified string; any partial matches are ignored. * **Flexibility:** * `match(pattern)`, while more flexible, can return multiple matches and may be slower due to the overhead of creating a regular expression object. **Library usage (if applicable):** None of the methods tested in this benchmark rely on external libraries. However, if using modern JavaScript features like Unicode support or advanced pattern matching (e.g., `^` at the start of the string), consider libraries like `unicode-matcher` for enhanced regex performance or ` match-sort-find` for advanced string matching. **Special JS feature/syntax:** This benchmark does not explicitly use any special JavaScript features, such as async/await, callbacks, Promises, or Generators. If used, these would likely be present in the actual test code but not affecting the interpretation of the methods being compared. **Alternatives and best practices:** * Consider using a library like `regex-micro-benchmark` for more advanced and accurate measurements. * Use `.test(regexp)` when working with complex patterns or requiring precise matching. * For simple, partial matches, consider using `.startsWith()` or similar methods based on the specific use case. In conclusion, understanding the differences between these string manipulation methods can help developers choose the best approach for their specific use cases.
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String Test indexOf vs Search
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RegEx.test vs. String.includes vs. String.match (long)
includes vs regex testcases
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