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Array slice vs for loop (set by index in new Array)
(version: 0)
Comparing performance of:
slice vs push
Created:
2 years ago
by:
Guest
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Script Preparation code:
var data = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
Tests:
slice
var copy = data.slice(3, 8);
push
var copy = new Array(8 - 3); for (var i = 3; i < 8; i++) { copy[i] = data[i]; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
slice
push
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.1:latest
, generated one year ago):
Let's dive into the details of this benchmark. **What is being tested?** This benchmark compares two different ways to copy an array in JavaScript: using the `slice()` method and using a `for` loop with indexing. **The options compared:** 1. **Array slice**: This option uses the `slice()` method to create a new array by copying elements from the original array, starting at index 3 up to but not including index 8. 2. **For loop with push**: This option uses a `for` loop to iterate over the range of indices (from 3 to 7) and assigns each element from the original array to a new array using indexing. **Pros/Cons:** * **Array slice**: + Pros: concise, readable code; built-in optimization for large arrays. + Cons: may not be as efficient for small arrays or edge cases (e.g., negative indices). * **For loop with push**: + Pros: explicit control over indexing and iteration; can handle edge cases more easily. + Cons: less concise and readable than `slice()`, may have performance overhead due to the loop. **Library/Feature used:** None, this benchmark only uses built-in JavaScript features. **Other considerations:** * **Array size**: The benchmark assumes an array of 10 elements (from 0 to 9). The results might differ for smaller or larger arrays. * **Performance variation**: The performance difference between `slice()` and the `for` loop may vary depending on the browser, device, and operating system used. **Other alternatives:** 1. Using `map()`: You could use the `map()` method to create a new array by mapping each element from the original array. 2. Using `splice()` and concatenation: You could use `splice()` to remove elements from the original array and concatenate them into a new array. Keep in mind that these alternatives may have their own trade-offs, such as performance differences or readability concerns. I hope this explanation helps you understand what's being tested and the implications of each approach!
Related benchmarks:
Array slice vs for loop
Array slice.forEach vs for loop
Array slice vs for loop (set by index)
Array slice vs for loop (new Array)
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