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Array slice vs for loop (set by index)
(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 = []; 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 the performance of two different methods for creating a sub-array from an existing array in JavaScript: using the `slice()` method and using a traditional `for` loop with manual copying. **Options Compared:** * **`slice()` Method:** This method takes two arguments, start index and end index (exclusive), and returns a new array containing elements from the original array within those bounds. * **Pros:** Concise, readable, built-in to JavaScript arrays, efficient in most cases. * **`for` loop with `push()`:** This method iterates through the desired indices of the original array and manually copies each element into a new array using the `push()` method. * **Pros:** Might offer more fine-grained control if you need to manipulate elements during the copying process. * **Cons:** Less concise, potentially less efficient than `slice()` due to the looping overhead. **Other Considerations:** * **Data Size:** The performance difference between these methods can become more pronounced with larger arrays. `slice()` is generally faster for creating sub-arrays of large datasets. * **Specific Use Case:** If you require modification of elements during the sub-array creation process, a `for` loop might be more suitable. However, for simple sub-array extraction, `slice()` is usually the preferred approach. **Alternatives:** While `slice()` and `for` loops are common methods, other approaches exist: * **Array Spread Operator (`...`):** For copying elements from a specific range of an array to another array, the spread operator can be used. For example, `[...data.slice(3, 8)]`. Let me know if you'd like a deeper dive into any specific aspect or have other benchmarks you'd like analyzed!
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