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filter vs push
(version: 0)
Comparing performance of:
for push vs filter
Created:
2 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var nums = [...(new Array(10000))].map((_, i) => i);
Tests:
for push
const result = []; for (const n of nums) { if (n%2) { result.push(n); } }
filter
const result = nums.filter(n => n&2);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
for push
filter
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 provided JSON and explain what's being tested. **Benchmark Definition** The benchmark is testing two approaches to filter out odd numbers from an array: using `push()` in a loop, and using the `filter()` method. **Script Preparation Code** The script preparation code creates an array of 10,000 numbers, where each number is its index (`i`) in the array. This will be used as the input data for the benchmark. **Html Preparation Code** There is no HTML preparation code provided, which suggests that this benchmark only tests the JavaScript engine's performance and does not involve any user interface or rendering logic. **Individual Test Cases** The two test cases are: 1. **"for push"`**: This test case uses a loop to create an array of odd numbers by pushing each odd number onto the `result` array. 2. **"filter"`**: This test case uses the `filter()` method to create an array of odd numbers, where only numbers with a remainder of 1 when divided by 2 (`n&2 == 1`) are included in the resulting array. **Library and Features** There is no explicit library mentioned, but it's likely that the benchmark is using the V8 JavaScript engine or similar. The `filter()` method is a built-in JavaScript method that uses a closure to iterate over the input array. No special JavaScript features or syntax are used beyond what's required for the benchmark itself. **Pros and Cons of Approaches** 1. **`push()` in a loop**: * Pros: This approach allows the JavaScript engine to dynamically allocate memory on the heap as needed, which can be beneficial for large arrays. * Cons: This approach can lead to slower performance due to the overhead of pushing elements onto the stack and then allocating new memory. 2. **`filter()` method**: * Pros: The `filter()` method is optimized by the V8 engine and uses a more efficient algorithm that doesn't require dynamic allocation or pushing elements onto the stack. * Cons: This approach requires creating a new array, which can lead to increased memory usage. Other alternatives for similar benchmarks might include: 1. **`map()` method**: Instead of using `push()` in a loop, you could use the `map()` method to create a new array with the filtered elements. 2. **Using a different data structure**: Depending on the specific requirements of the benchmark, using a different data structure (e.g., a set or an object) might provide better performance. **Benchmark Result** The latest benchmark result shows that the `filter()` method performed slightly better than the `push()` in a loop approach. However, this may vary depending on the specific hardware and software configuration used to run the benchmark.
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