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filter vs spread filter
(version: 0)
Comparing performance of:
filter vs spread filter
Created:
4 years ago
by:
Guest
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Tests:
filter
const arr = Array.from(Array(1000)).map((_, i) => i); const newArr = arr.filter(i => i % 2 === 0);
spread filter
const arr = Array.from(Array(1000)).map((_, i) => i); const newArr = [...arr.filter(i => i % 2 === 0)];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
filter
spread filter
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. The provided JSON represents a JavaScript microbenchmark, which is a small piece of code designed to measure the performance of specific parts of the JavaScript engine. The benchmark consists of two test cases: 1. `filter` 2. `spread filter` **What is being tested?** In both test cases, an array of 1000 elements is created using `Array.from(Array(1000)).map((_, i) => i)`. This creates an array where each element is a number from 0 to 999. The difference between the two test cases lies in how the even numbers are filtered out: **Test Case 1: `filter`** ```javascript const newArr = arr.filter(i => i % 2 === 0); ``` In this case, the `Array.prototype.filter()` method is used to create a new array that only includes elements from the original array where the expression `i % 2 === 0` evaluates to true. **Test Case 2: `spread filter`** ```javascript const newArr = [...arr.filter(i => i % 2 === 0)]; ``` In this case, the spread operator (`...`) is used in conjunction with the `Array.prototype.filter()` method. The filtered array is then spread into a new array using the spread operator. **Options compared** The two test cases compare the performance of these two different approaches: * `filter` (without the spread operator) * `spread filter` (with the spread operator) **Pros and Cons** **Test Case 1: `filter`** Pros: * Easier to read and understand * Less memory allocation required, as only one array is created Cons: * May be slower due to the additional memory allocation required by the spread operator in the second test case **Test Case 2: `spread filter`** Pros: * Faster performance, as less memory allocation is required * Still readable and understandable, although slightly more complex Cons: * More memory allocated, which may impact performance for very large arrays **Library usage** None of the provided code snippets use any external libraries. The `Array.from()` method and the spread operator are built-in JavaScript features. **Special JS feature or syntax** The use of the spread operator (`...`) in Test Case 2 is a relatively modern feature introduced in ECMAScript 2015 (ES6). It allows for efficient array creation without using the `Array.prototype.slice()` method. **Other alternatives** If the benchmark were to compare other approaches, some possible alternatives could include: * Using `slice()` instead of spread operator * Using a custom filtering function * Using a library like Lodash's `filter()` function However, in this specific case, the test cases only compare two simple and straightforward approaches: using the `Array.prototype.filter()` method with or without the spread operator.
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