Benchmark: check navigator.language v4

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'
substring()
'ru'===navigator.language.substring(0,2)
===
navigator.language==='ru-RU'
test() 2
/^ru-?/.test(navigator.language)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
indexOf()
substr()
test()
=== \|\| ===
substring()
===
test() 2

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 months ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:135.0) Gecko/20100101 Firefox/135.0

Browser/OS: Firefox 135 on Linux

View result in a separate tab

Test name	Executions per second
indexOf()	3278089.2 Ops/sec
substr()	3254465.8 Ops/sec
test()	2844087.0 Ops/sec
=== \|\| ===	1624196.2 Ops/sec
substring()	3239415.0 Ops/sec
===	3296522.2 Ops/sec
test() 2	2750311.2 Ops/sec

Autogenerated LLM Summary (model gpt-4o-mini, generated 2 months ago):

LLMs can make mistakes. Check important info.

The benchmark defined by the JSON examines the performance of various methods for checking the user's language preference through the `navigator.language` property in JavaScript. This property returns a string representing the user's preferred language, typically in the format of a language code (like "en" for English or "ru" for Russian).

### Test Cases Overview

1. **indexOf()**: 
   - Benchmark Definition: `!navigator.language.indexOf('ru')`
   - This test checks if the string "ru" appears at the beginning of `navigator.language` by using the indexOf method. If "ru" is found, it returns 0 (which evaluates to `false` when negated). 
   - **Pros:** Simple and readable; easily checks for the presence of a substring.
   - **Cons:** Less efficient since it needs to scan the whole string.

2. **substr()**:
   - Benchmark Definition: `'ru'===navigator.language.substr(0,2)`
   - This checks if the first two characters of `navigator.language` are "ru".
   - **Pros:** Specific check at the beginning of the string, which is generally fast.
   - **Cons:** Creates a new string, potentially affecting performance with many checks.

3. **test()**:
   - Benchmark Definition: `/^ru/.test(navigator.language)`
   - This uses a regular expression to test if `navigator.language` starts with "ru".
   - **Pros:** Very efficient for pattern matching; can easily be extended for more complex checks.
   - **Cons:** Slightly more complex and less readable for those unfamiliar with regex.

4. **=== || ===**:
   - Benchmark Definition: `navigator.language==='ru'||navigator.language==='ru-RU'`
   - This compares `navigator.language` directly to "ru" and "ru-RU".
   - **Pros:** Direct and clear; highly efficient due to the straightforward comparison.
   - **Cons:** Less flexible compared to substring or regex checks; code might grow if many language variants need to be checked.

5. **substring()**:
   - Benchmark Definition: `'ru'===navigator.language.substring(0,2)`
   - Similar to `substr()`, it extracts the substring and checks for equality.
   - **Pros & Cons:** Similar considerations as `substr()`.

6. **===**:
   - Benchmark Definition: `navigator.language==='ru-RU'`
   - This checks for equality with a specific string.
   - **Pros:** Fastest option for a strict comparison.
   - **Cons:** Limited, as it checks for one exact value.

7. **test() 2**:
   - Benchmark Definition: `/^ru-?/.test(navigator.language)`
   - This regex checks if the language starts with "ru" followed by an optional hyphen.
   - **Pros:** Allows for flexibility in checking various related language codes (like "ru-RU").
   - **Cons:** Similar to the earlier regex test, it may add complexity.

### Performance Results Overview

From the benchmark results, we see the following executions per second:

- The fastest method is the strict equality check `===` with the value "ru", achieving about 2,528,682.75 executions per second.
- Next is the `substring()` method, followed closely by the `indexOf()` method. These methods, while slower, still perform well and give more flexibility in checks.
- The regex tests, particularly those that are more complex, have a lower execution rate, indicating a slight performance hit due to the overhead of pattern matching.

### Other Considerations and Alternatives

- In cases where performance and readability are critical, using strict comparisons (for exact matches) should be favored. Direct string checks are generally faster than substring checks.
- Libraries like **Lodash** can provide utility functions for ease of use, though they may introduce additional overhead.
- If needed, languages or regions can be managed more systematically through localization libraries or frameworks, which often come with built-in methods for handling language preferences.

By understanding these test cases and their pros and cons, software engineers can make informed decisions on how to effectively check or gather user language preferences while considering both performance and maintainability of their code.

Related benchmarks:

check navigator.language v4 (version: 1)

Comparing performance of: indexOf() vs substr() vs test() vs === || === vs substring() vs === vs test() 2

Created: 2 months ago by: Guest

Jump to the latest result

indexOf()

substr()

test()

=== || ===

substring()

===

test() 2

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated 2 months ago):