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Removal from array
(version: 0)
Comparing performance of:
Keep items that are not supposed to be removed vs Remove items that are supposed to be removed
Created:
6 years ago
by:
Guest
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Tests:
Keep items that are not supposed to be removed
let items = [{ id: 1 }, { id: 2 }, { id: 3 }, { id: 4 }, { id: 5 }, { id: 6 }]; const itemsToRemove = [{ id: 2 }, { id: 4 }, { id: 5 }]; items = items.filter(item => !itemsToRemove.find(remove => remove.id === item.id));
Remove items that are supposed to be removed
let items = [{ id: 1 }, { id: 2 }, { id: 3 }, { id: 4 }, { id: 5 }, { id: 6 }]; const itemsToRemove = [{ id: 2 }, { id: 4 }, { id: 5 }]; itemsToRemove.forEach(remove => { const index = items.findIndex(item => item.id === remove.id); items.splice(index, 1); });
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Suite status:
<idle, ready to run>
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Test case name
Result
Keep items that are not supposed to be removed
Remove items that are supposed to be removed
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net. **Benchmark Definition:** The benchmark definition represents a test case where we're removing elements from an array in two different ways: 1. **Using `filter()`**: This approach uses the `filter()` method to create a new array that includes only the items that are not supposed to be removed. 2. **Using `forEach()` and `splice()`**: This approach iterates over the `itemsToRemove` array, finds the index of each item in the original array, and then uses `splice()` to remove the item at that index. **Options Compared:** The two approaches compare the performance of using `filter()` versus `forEach()` with `splice()`. The choice of approach can significantly impact performance due to differences in overhead, memory allocation, and iteration mechanisms. **Pros and Cons:** * **Using `filter()`**: + Pros: Efficient, concise, and easy to read. It avoids the need for explicit looping and indexing. + Cons: Can be slower for large arrays due to the creation of a new array object. * **Using `forEach()` with `splice()`**: + Pros: Can be faster for large arrays since it avoids creating a new array object. However, it's more verbose and error-prone. + Cons: Involves modifying the original array, which can lead to unexpected side effects. The use of `splice()` also creates temporary copies of the elements being removed. **Library Used:** In this benchmark, there is no explicit library mentioned. However, it's likely that MeasureThat.net handles the underlying JavaScript engine and environment for each browser, ensuring consistent results across different platforms. **Special JS Feature/Syntax:** There are no special JavaScript features or syntaxes used in these benchmarks beyond standard JavaScript syntax. **Other Alternatives:** For removing elements from an array, some alternative approaches could include: * Using `map()` with a callback function that returns `undefined` for the items to be removed. * Using `reduce()` to accumulate the indices of items to be removed and then using `slice()` or `splice()` to remove them. However, these alternatives might not provide significant performance improvements over the existing approaches, especially considering the trade-offs between readability, conciseness, and performance.
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