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check navigator.language
(version: 1)
Comparing performance of:
indexOf() vs substr() vs test() vs === || ===
Created:
one year ago
by:
Guest
Go to the latest result
Tests:
indexOf()
!navigator.language.indexOf('ru')
substr()
'ru'===navigator.language.substr(0,2)
test()
/^ru/.test(navigator.language)
=== || ===
navigator.language==='ru'||navigator.language==='ru-RU'
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
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Test case name
Result
indexOf()
substr()
test()
=== || ===
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36
Browser/OS:
Chrome 109 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=586850" width="100%" height="500px"></iframe>
substr()
2.4M/s
indexOf()
2.4M/s
test()
2.0M/s
=== || ===
1.1M/s
View exact numbers
Test name
Executions per second
✓
substr()
2,364,791 Ops/sec
indexOf()
2,350,336 Ops/sec
test()
2,038,640 Ops/sec
=== || ===
1,149,865 Ops/sec
Autogenerated LLM Summary
(model
gpt-4o-mini
, generated one year ago):
The benchmark provided evaluates different methods for checking if the user's browser language setting (specifically the `navigator.language` property) starts with 'ru', which indicates that the user is either from Russia or uses the Russian language. Each test case employs a different JavaScript string handling method to accomplish this task. ### Test Cases Overview 1. **`indexOf()`**: The expression `!navigator.language.indexOf('ru')` checks if 'ru' is found at the start of the string. If `indexOf` returns 0, the negation operator turns it into `false`, effectively indicating that the language starts with 'ru'. 2. **`substr()`**: The expression `'ru'===navigator.language.substr(0,2)` checks if the substring of the first two characters of `navigator.language` exactly matches 'ru'. This is a direct comparison and is quite clear in its intent. 3. **`test()` Method**: The expression `/^ru/.test(navigator.language)` uses a regular expression to check if 'ru' is at the beginning of the string. The `^` anchor asserts that what follows must be at the start of the string. 4. **Logical OR `=== || ===`**: The expression `navigator.language==='ru'||navigator.language==='ru-RU'` explicitly checks if the language is either 'ru' or 'ru-RU' through logical disjunction. ### Performance Results The benchmark results indicate the number of executions per second for each method: - **`substr()`**: 2,364,790.75 executions/second (fastest). - **`indexOf()`**: 2,350,335.5 executions/second (second fastest). - **`test()`**: 2,038,640.5 executions/second. - **`=== || ===`**: 1,149,865.375 executions/second (slowest). ### Pros and Cons of Each Approach 1. **`indexOf()`**: - **Pros**: Simple and versatile for checking substrings in various contexts. - **Cons**: Requires negation to translate the return value, making the logic less intuitive. 2. **`substr()`**: - **Pros**: Clear in intent—compares a specific substring directly. Generally performs well. - **Cons**: Performs string slicing, which might be slightly less efficient compared to direct checks, albeit only marginally. 3. **`test()`**: - **Pros**: Leverages regular expressions, which is powerful for complex matching. - **Cons**: Overhead of regex processing can make it slower for simple cases. 4. **`=== || ===`**: - **Pros**: Clear and straightforward in explicitness, making the intent obvious. - **Cons**: Can become cumbersome to extend for larger sets of conditions. Performance is less optimal due to multiple checks and comparisons. ### Other Considerations - For most situations, especially when checking for a language code, `substr()` and `indexOf()` are typically preferred due to their balance of readability and performance. - Regular expressions (`test()`) are great for more complex matching scenarios but could be overkill for simple checks like this. - The `=== || ===` approach might lead to more complex conditions more quickly, but isn't scalable for many variations. ### Alternatives - Other string methods, such as `startsWith()`, could be considered for a cleaner syntax. Using `navigator.language.startsWith('ru')` would simplify the check to its intent directly and typically offer good performance. - One might also consider normalizing `navigator.language` (e.g., `toLowerCase()`) if case insensitivity is necessary, though that could introduce additional computational overhead. Overall, the choice of method can depend on specific use cases, performance needs, and personal or team coding style preferences.
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