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Test AAAAA
(version: 0)
Comparing performance of:
A vs B
Created:
one year ago
by:
Guest
Go to the latest result
Tests:
A
const ALLOW_LETTERS = 2; const REPLACER = '*'; var value = "ok123"; var result = value.slice(0, ALLOW_LETTERS) + REPLACER.repeat(value.length - ALLOW_LETTERS);
B
const ALLOW_LETTERS = 2; const REPLACER = '*'; var value = "ok123"; var result = value.split('').map(function(letter, index) { if (index >= ALLOW_LETTERS && !/\s/.test(letter)) { return REPLACER; } return letter; }).join('');
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
A
B
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:131.0) Gecko/20100101 Firefox/131.0
Browser/OS:
Firefox 131 on Ubuntu
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=559766" width="100%" height="500px"></iframe>
A
27.3M/s
B
3.2M/s
View exact numbers
Test name
Executions per second
✓
A
27,319,404 Ops/sec
B
3,235,767 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Measuring JavaScript performance is an essential task for developers, and MeasureThat.net provides a convenient platform for benchmarking. The provided JSON data represents two test cases (A and B) for measuring the performance of JavaScript string manipulation operations. **Benchmark Definition:** The benchmark definition specifies the code to be executed during the benchmark. In this case, both tests involve manipulating strings using a fixed-length replacement pattern. The main difference between the two tests lies in the approach used: **Test A:** Uses `slice()` and `repeat()` ```javascript var result = value.slice(0, ALLOW_LETTERS) + REPLACER.repeat(value.length - ALLOW_LETTERS); ``` * **Pros:** + Simple and straightforward implementation. + Easy to understand and maintain. * **Cons:** + May not be optimized for performance, as it uses multiple function calls. **Test B:** Uses `split()`, `map()`, and `join()` ```javascript var result = value.split('').map(function(letter, index) { if (index >= ALLOW_LETTERS && !/\\s/.test(letter)) { return REPLACER; } return letter; }).join(''); ``` * **Pros:** + Can be optimized for performance using array methods. + More expressive and flexible code structure. * **Cons:** + May have a steeper learning curve due to the use of advanced JavaScript features. **Other considerations:** * **String manipulation patterns:** Both tests involve replacing characters in a string based on their position. This pattern is common in various string processing tasks, making it a good choice for benchmarking. * **Browser-specific optimizations:** Modern browsers often provide optimized string manipulation functions (e.g., `String.prototype.replace()`) that can outperform simple implementations like those shown above. **Library usage:** None of the provided test cases use any external libraries. However, MeasureThat.net itself relies on various libraries and frameworks for its functionality. **Special JS features:** Neither test case uses special JavaScript features like ES6 modules, async/await, or `const` expressions with let declarations. Now that you know what's being benchmarked, here are some alternative approaches to consider: 1. **Other string manipulation functions:** Explore other built-in string methods, such as `String.prototype.replace()`, `String.prototype.substring()`, or `Array.prototype.slice()`. 2. **Third-party libraries:** Research and use popular JavaScript libraries like Lodash, Underscore.js, or String-promise (a promise-based library for string manipulation). 3. **Custom implementation optimizations:** Experiment with custom optimization techniques, such as caching, memoization, or parallel processing. 4. **Performance testing frameworks:** Use dedicated performance testing frameworks like Benchmark.js, WebPageTest, or Google's Chrome DevTools Performance profiling.
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