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Map vs Filter
(version: 0)
Comparing performance of:
FilterFilter vs Map
Created:
2 years ago
by:
Guest
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Script Preparation code:
var arr = []; var mapArr = []; for (var i = 0; i < 12345; i++) { arr[i] = i; } function someFn(i) { return i % 2 === 0; }
Tests:
FilterFilter
arr.filter(someFn);
Map
arr.map((el, idx) => { if (el % 2 === 0) { mapArr.push(el); } });
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
FilterFilter
Map
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark and explain what's being tested. **Benchmark Definition** The benchmark is comparing two approaches: `arr.filter(someFn)` (Filter) and `arr.map((el, idx) => { ... })` (Map). These are both array methods in JavaScript that can be used to filter or transform an array of elements. **What's being tested?** The benchmark is testing the performance difference between these two approaches. Specifically: * Is the `filter()` method more efficient than the `map()` method for this particular use case? * How does the browser (in this case, Mobile Safari 17) execute these methods? **Options compared** In this case, we have only two options being compared: Filter and Map. **Pros and Cons of each approach** **Filter** Pros: * Faster execution time, since it stops iterating as soon as it finds a match * Fewer unnecessary computations Cons: * May require more iterations to find the desired result (since it's stopping early) * May not be suitable for all use cases where you need to transform the entire array **Map** Pros: * Allows for transformations on each element of the array * Can be useful when you need to perform multiple operations on each element Cons: * More computations, since it processes every single element in the array * May be slower due to unnecessary iterations **Library usage (none)** In this benchmark, no libraries are used. **Special JS feature or syntax (none)** There is no special JavaScript feature or syntax being tested in this benchmark. It's a simple comparison of two common array methods. **Other alternatives** If you're looking for alternative approaches to filtering and mapping arrays, some other options might include: * Using `forEach()` with a callback function * Using a custom loop (e.g., a `for` loop) * Using a library like Lodash (which provides `filter()` and `map()` methods) Keep in mind that the performance differences between these approaches can be significant, so it's worth considering the specific requirements of your use case when choosing an approach.
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