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startsWith vs inlcudes v2
(version: 0)
Comparing performance of:
startsWith vs includes
Created:
4 years ago
by:
Registered User
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Tests:
startsWith
const str = "Прицеп полуприцеп"; str.startsWith("Прицеп");
includes
const str = "Прицеп полуприцеп"; str.includes("полупр");
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Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
startsWith
includes
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark and analyze what's being tested. **Benchmark Overview** The benchmark measures the performance difference between two JavaScript methods: `startsWith` and `includes`. Both methods are used to check if a string starts with a certain substring. **Options Compared** The options being compared are: 1. `startsWith` 2. `includes` These two methods are part of the JavaScript String prototype and are widely supported by most modern browsers. **Pros and Cons** * `startsWith`: + Pros: More efficient and faster for short strings or when the search substring is shorter than the original string. + Cons: May not be suitable for searching substrings that are equal in length to the original string, as it may return false positives. * `includes`: + Pros: Suitable for searching substrings of any length, even if they're longer than the original string. It's also more flexible and can handle Unicode characters. + Cons: May be slower than `startsWith` for very short strings or when the search substring is shorter than the original string. **Library Usage** There are no explicit libraries used in this benchmark. However, it's likely that the JavaScript engine being tested (e.g., V8) uses some internal libraries or optimized implementations of these methods. **Special JS Features/Syntax** None mentioned. **Other Alternatives** If you need to optimize string searching, you might consider using: 1. RegEx (Regular Expressions): More powerful and flexible, but also slower due to the complexity of the regular expression engine. 2. String manipulation libraries like UglifyJS or String.prototype.extend: Can provide faster implementations, but may add extra overhead due to the library's complexity. Keep in mind that these alternatives might not be necessary for most use cases, and `startsWith` and `includes` are usually sufficient and efficient enough. **Benchmark Results** The benchmark results show the execution rate per second (ExecutionsPerSecond) for each test case. In this case: * `startsWith`: 81,403,896 executions/second * `includes`: 42,311,296 executions/second This suggests that `startsWith` is slightly faster than `includes`. However, the actual performance difference may vary depending on the specific use case and input data. Overall, this benchmark provides a useful insight into the performance characteristics of two commonly used JavaScript string methods.
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