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startsWith speed
(version: 0)
Benchmark.js
Comparing performance of:
startsWith vs !=
Created:
2 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var path = "/directory/subfolder"; var currentDirectory = "directory"; var currentPath = "/directory/subfolder2";
Tests:
startsWith
path.startsWith("/" + currentDirectory);
!=
path != currentPath
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
startsWith
!=
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:121.0) Gecko/20100101 Firefox/121.0
Browser/OS:
Firefox 121 on Windows
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<iframe src="https://measurethat.net/Embed?id=494931" width="100%" height="500px"></iframe>
startsWith
1324.4M/s
!=
1232.9M/s
View exact numbers
Test name
Executions per second
✓
startsWith
1,324,355,328 Ops/sec
!=
1,232,930,944 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested. **Benchmark Overview** The provided JSON represents a JavaScript microbenchmark, specifically measuring the performance of `path.startsWith()` and `"!"` (not equal) operators in different browsers. **Script Preparation Code** Before running the test, the script prepares some variables: ```javascript var path = "/directory/subfolder"; var currentDirectory = "directory"; var currentPath = "/directory/subfolder2"; ``` These variables are likely set to specific values to isolate the performance of the operators being tested. The `path` variable is used as a string that starts with a certain directory, while the `currentDirectory` and `currentPath` variables provide different starting points for the comparison. **Benchmark Definition** The benchmark consists of two test cases: 1. `startsWith`: This test case uses the `path.startsWith()` function to check if the `path` variable starts with `/`. The expected result is likely a simple yes/no condition, but the actual implementation might be more complex. 2. `"!"`: This test case uses the `!=` operator to compare two strings. In this case, it's comparing the `path` variable with the `currentPath` variable. **Comparison** The comparison between `startsWith()` and `"!"` is likely to highlight performance differences in these two operators: * `startsWith()`: This function might involve more complex string processing or regular expression matching, which could impact its performance. * `"!"`: The equality check using the `!=` operator might be faster since it's a simple string comparison without any additional processing. **Pros and Cons** Here are some pros and cons for each approach: * `startsWith()`: + Pros: Might perform well if the regular expression engine is optimized for this specific use case. + Cons: May involve more complex string processing, which can lead to slower performance. * `"!"`: + Pros: A simple string comparison that might be faster due to its straightforward implementation. + Cons: It's not as flexible as `startsWith()` since it only checks for inequality. **Library and Special JS Features** In this benchmark, there is no explicit library used. However, the use of the `"!"` operator suggests using a JavaScript interpreter or engine that supports string comparison (e.g., Firefox). There are no special JavaScript features mentioned in this benchmark. **Other Alternatives** For measuring performance differences between `startsWith()` and `"!"`, you could consider other approaches: * Measure the performance of different string comparison operators, such as `===`, `!==`, or `includes()`. * Use a regex engine like RegExp to measure the performance of regular expression-based string comparisons. * Compare the performance of different JavaScript implementations or engines. In summary, this benchmark aims to compare the performance of `startsWith()` and `"!"` operators in different browsers. The test cases use specific variables to isolate the comparison, and the results are expected to highlight any performance differences between these two operations.
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