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Join vs filter + includes
(version: 1)
Comparing performance of:
Join vs filter + includes
Created:
4 years ago
by:
Registered User
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Script Preparation code:
var columns = Array.from(new Array(10000)).map(() => ({ fieldName: 'column' })); var preselectedColumns = Array.from(new Array(10000)).map(() => 'column') var result = []
Tests:
Join
columns.map((child) => { const childChecked = preselectedColumns.includes(child.fieldName); if (childChecked) { result.push(child.fieldName); } })
filter + includes
result = columns .filter(({ fieldName }) => preselectedColumns.includes(fieldName))
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Join
filter + includes
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested. **Overview** The benchmark compares two approaches to filter an array of objects based on whether their `fieldName` property is included in another array (`preselectedColumns`). The first approach uses a `join` operation, while the second approach uses a `filter` method with `includes`. **Approaches Compared** 1. **Join**: This approach creates a new string by concatenating all elements of `columns` that pass the test using `includes`. The resulting string is not stored in memory. 2. **Filter + Includes**: This approach filters the `columns` array and pushes only the objects whose `fieldName` property is included in `preselectedColumns` into a new array (`result`). **Pros and Cons** **Join** Pros: * Can be more efficient than filtering, especially for large datasets, since it doesn't require creating a new array. * Avoids the overhead of function calls and array indexing. Cons: * Creates a new string, which can consume significant memory if `columns` is very large. * May not be as readable or maintainable as the `filter + includes` approach. **Filter + Includes** Pros: * More readable and maintainable than the `join` approach. * Does not create unnecessary strings or memory allocations. * Can be more flexible, as it allows for easier modification of the filtering logic. Cons: * Requires creating a new array (`result`) to store the filtered objects, which can consume memory. * May incur higher overhead due to function calls and array indexing. **Other Considerations** * The `includes` method has a time complexity of O(n), where n is the length of the `preselectedColumns` array. This means that as the size of this array increases, the performance difference between these two approaches may decrease. * Using `filter()` with `includes` can be slower than using `join`, especially for very large arrays, since it requires creating a new array and iterating over its elements. **Libraries Used** The benchmark uses the `Array.from()` method to create new arrays from the given data. This is a modern JavaScript feature introduced in ECMAScript 2015 (ES6). **Special JS Features or Syntax** None mentioned in this explanation, but it's worth noting that `const` and `let` are used for variable declarations, which is a modern JavaScript convention. **Alternatives** If the goal is to filter an array of objects based on whether their property is included in another array, other approaches could be considered: * Using `Set` data structure: Convert `preselectedColumns` to a set and then iterate over `columns`, checking if each element's `fieldName` property is present in the set. * Using a custom loop: Implement a simple loop that checks each element of `columns` against `preselectedColumns` using a conditional statement. However, these alternatives might not be as efficient or readable as the `filter + includes` approach.
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