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feachand
(version: 0)
Comparing performance of:
slicearray vs foreachddd
Created:
5 years ago
by:
Guest
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Script Preparation code:
var data = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
Tests:
slicearray
let g = data.slice(3, 8)
foreachddd
var g = []; var j = 0; for (var i = 3; i < 8; i++) { g[j++] = data[i] }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
slicearray
foreachddd
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
gemma2:9b
, generated one year ago):
This benchmark on MeasureThat.net compares two ways to extract a subset of elements from an array in JavaScript: **Option 1: `slice()` method:** * **Benchmark Definition:** `let g = data.slice(3, 8)` * This uses the built-in `slice()` method to create a new array containing elements from index 3 (inclusive) up to index 8 (exclusive). It's a concise and efficient way to extract a portion of an array. **Option 2: Manual `for` loop:** * **Benchmark Definition:** `var g = [];\r\n var j = 0;\r\n for (var i = 3; i < 8; i++) {\r\n g[j++] = data[i]\r\n}` * This implements the same functionality using a `for` loop to iterate through the desired indices and manually build a new array. **Pros & Cons:** * **`slice()`:** * **Pros:** Highly optimized by JavaScript engine, very readable and concise. * **Cons:** Can't modify the original array (unless you use `splice` instead). Not as flexible if you need to perform additional operations on elements during extraction. * **Manual Loop:** * **Pros:** More control over the process – you can add custom logic within the loop to filter, transform, or manipulate elements before adding them to the new array. * **Cons:** Can be less efficient than `slice()`, especially for large arrays, due to the overhead of iteration. Less readable and more verbose. **Considerations:** * **Performance:** For simple array extraction, `slice()` is generally faster due to its built-in optimization. However, if you have complex logic within the extraction process, a manual loop might be necessary. * **Readability & Maintainability:** `slice()` is often more readable and easier to understand for straightforward operations. **Other Alternatives:** While `slice()` and manual loops are common approaches, there are other options depending on your specific needs: * **Array methods like `filter()`, `map()`, `reduce()`:** These can be used to extract elements based on conditions or transform them during the process. * **Libraries like Lodash:** Provide utility functions for array manipulation, including specialized extraction methods that might be more efficient than built-in options in certain scenarios.
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