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subarray vs. constructor perf
(version: 0)
Comparing performance of:
1 vs 2
Created:
4 years ago
by:
Guest
Go to the latest result
Script Preparation code:
dat = new Uint8Array(1000000);
Tests:
1
dat.subarray(78);
2
new Uint8Array(dat, 78);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
1
2
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36
Browser/OS:
Chrome 130 on Linux
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=565565" width="100%" height="500px"></iframe>
1
4.0M/s
2
2K/s
View exact numbers
Test name
Executions per second
✓
1
3,977,754 Ops/sec
2
1,780 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks and explore what's being tested on MeasureThat.net. **Benchmark Overview** The provided benchmark is designed to compare the performance of two approaches: 1. `subarray` method: This method creates a new array from a portion of another array. 2. `constructor` method: This method creates a new instance of an array constructor. **Options Compared** The benchmark compares the performance of these two methods for creating a subarray with a specific starting index (78) in a large array (`dat`) that has 1,000,000 elements. **Pros and Cons** * **subarray method**: + Pros: More intuitive and concise syntax. It's a standard JavaScript method. + Cons: Might be slower due to the overhead of creating a new array. * **constructor method**: + Pros: Can potentially be faster since it avoids the overhead of creating a new array. + Cons: Requires more code, making it less intuitive and concise. **Library and Purpose** The `Uint8Array` constructor is used in both benchmark cases. A `Uint8Array` is an array-like object that holds unsigned 8-bit integers (uints) values, which are often used for efficient numerical computations. **Special JavaScript Features or Syntax** There's no special JavaScript feature or syntax being tested in this benchmark. The focus is on comparing the performance of two different methods for creating a subarray. **Other Alternatives** While not explicitly compared in this benchmark, other alternatives for creating a subarray include: * Using the `Array.prototype.slice()` method: This method creates a shallow copy of a portion of an array. * Using the `Array.prototype.slice.call()` method: This method converts an array-like object into an array. Keep in mind that these alternatives might have different performance characteristics compared to the `subarray` and `constructor` methods used in this benchmark. I hope this explanation helps you understand what's being tested on MeasureThat.net!
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