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for vs foreach vs for..of vs for..of over entries random
(version: 0)
Compare loop performance
Comparing performance of:
for vs foreach vs for..of vs for..of over entries
Created:
4 years ago
by:
Guest
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Script Preparation code:
var array = Array.from({length: 100}).map(el => Math.floor(Math.random() * 1000)) var t;
Tests:
for
for (let i = 0; i < array.length; i++) { t = array[i] * 2; }
foreach
array.forEach(function(v, i) { t = v * 2; });
for..of
for (var v of array) { t = v * 2; }
for..of over entries
for (var [i, v] of array.entries()) { t = v * 2; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
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Test case name
Result
for
foreach
for..of
for..of over entries
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to explain the benchmark and its various test cases. **What is being tested?** The provided JSON represents a JavaScript microbenchmarking test, where different loop constructs are compared for their performance in executing a simple task. The test focuses on four types of loops: 1. Traditional `for` loop 2. `forEach` method 3. `for...of` loop 4. `for...of` loop with `entries()` method **Options comparison** The different approaches offer varying trade-offs between ease of use, performance, and memory usage. * **Traditional `for` loop**: A classic, straightforward loop that requires manual indexing. + Pros: Easy to understand and implement, low memory overhead. + Cons: Can be slower due to manual indexing. * **`forEach` method**: A convenient, high-level loop that iterates over an array using a callback function. + Pros: Easy to use, no manual indexing required, good performance. + Cons: May have lower performance compared to traditional loops for small arrays or specific use cases. * **`for...of` loop**: A modern, expressive loop that allows iterating over arrays and iterable objects without manual indexing. + Pros: Easy to understand and implement, efficient performance, minimal memory overhead. + Cons: May not be suitable for all types of data structures (e.g., arrays with fixed length). * **`for...of` loop with `entries()` method**: A variation of the `for...of` loop that allows iterating over array entries directly without manual indexing. + Pros: Offers a middle ground between traditional loops and `forEach`, good performance, minimal memory overhead. + Cons: May have slightly higher memory usage compared to plain `for...of` loop. **Library** None of the test cases rely on external libraries. However, if you were to use modern JavaScript features like Promises or async/await, they are not explicitly used in this benchmark. **Special JS feature/syntax** There is no special JavaScript feature or syntax being tested in this benchmark. All tests follow standard JavaScript conventions and do not utilize experimental features. **Alternative approaches** If you wanted to compare these loops for a different task or with additional variations, consider the following alternatives: * **Parallel processing**: Run each loop variant concurrently using `Promise.all()` or Web Workers to measure performance under multi-threaded conditions. * **Dynamic array sizes**: Adjust the size of the input arrays to explore how these loops handle varying data sizes and performance implications. * **Different iteration patterns**: Test other iteration patterns, such as `while` loops or recursive functions, to understand their relative performance. Keep in mind that changing these test cases would likely require significant modifications to the benchmark setup and results analysis.
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