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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
gemma2:9b
, generated one year ago):
This benchmark tests two different ways to create a subarray from an existing array in JavaScript: using the `slice()` method and manually iterating with a `for` loop to construct a new array (`push`). Let's break down each approach: **1. `slice()` Method:** * **Definition:** `data.slice(3, 8)` creates a new array containing elements from the original array (`data`) starting at index 3 (inclusive) and ending at index 8 (exclusive). * **Pros:** Concise, efficient, and generally considered the preferred method for subarray creation in JavaScript. It directly extracts elements without modifying the original array. **2. `for` Loop with `push()`:** * **Definition:** A `for` loop iterates from index 3 to 7 (inclusive), copying each element from the original array (`data`) to a newly created array (`copy`). * **Pros:** Provides more explicit control over the subarray creation process. You can potentially customize the logic within the loop if needed. * **Cons:** More verbose and potentially less performant compared to `slice()`. It involves multiple steps (allocation of a new array, iteration, assignment) which might add overhead. **Considerations:** * **Performance:** The benchmark results typically show that the `slice()` method is significantly faster for subarray creation tasks. * **Readability:** The `slice()` method offers cleaner and more readable code. * **Conciseness:** `slice()` accomplishes the task with a single line, while the `for` loop approach requires multiple lines. **Alternatives:** While these are the primary methods illustrated in this benchmark, there are other ways to create subarrays: * **Array destructuring:** A more modern approach introduced in ES6, but its performance might not always be as optimal as `slice()` for large arrays. * **`splice()` method:** Can be used to extract a subarray and modify the original array, which might be relevant in certain scenarios but adds side effects.
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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