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foreach vs for...of w/o enties() for uint8array
(version: 0)
Compare loop performance
Comparing performance of:
forOf vs foreach
Created:
2 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var a = new Uint8Array(10000); for (let i = 0; i < 10000; i++) { a[i] = ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c => (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)); }
Tests:
forOf
for (const item of a) { console.log(item) }
foreach
a.forEach((item) => console.log(item))
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
forOf
foreach
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark and explain what's being tested. **Benchmark Definition** The benchmark is designed to compare the performance of two loop types in JavaScript: 1. **Traditional `for` loop with an index variable**: The first test case uses a traditional `for` loop with an index variable (`let i = 0; i < 10000; i++)`. This approach is a fundamental part of JavaScript and has been around for a long time. 2. **`for...of` loop without iteration over an array or object**: The second test case uses a `for...of` loop that iterates directly over the elements of a `Uint8Array` (an array of unsigned 8-bit integers). This approach is optimized for iterating over arrays and objects, but can be slower than traditional loops when used with indices. **Comparison** The benchmark compares the performance of these two approaches: * **Traditional `for` loop**: Pros - widely supported, well-understood, and easy to optimize. Cons - can be slower due to index calculations and potential overhead. * **`for...of` loop without iteration over an array or object**: Pros - optimized for arrays and objects, potentially faster than traditional loops. Cons - may not work correctly with indices, limited support. **Other considerations** When choosing between these approaches, consider the specific use case: * Use a `for...of` loop when iterating over arrays or objects, as it's optimized for this scenario. * Use a traditional `for` loop when working with indices or specific iteration requirements. **Library and special features** In this benchmark, no libraries are used beyond the built-in JavaScript functions (`crypto`, which is not required in this case). There are no special features like async/await, classes, or modern syntax features that might affect performance. **Other alternatives** If you're looking for alternative loop types or optimizations: * **`while` loops**: Can be faster than `for` loops when dealing with complex iteration logic. * **`forEach` method on arrays**: Similar to the traditional `for` loop, but optimized for array iteration. * **`map`, `filter`, and `reduce` methods on arrays**: Can simplify code and potentially improve performance by avoiding unnecessary iterations. Keep in mind that the best approach depends on the specific use case and the requirements of your project.
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foreach vs for...of w/ enties() for uint8array
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