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loops performance
(version: 0)
Comparing performance of:
from vs for
Created:
3 years ago
by:
Guest
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Tests:
from
const array = Array.from({length: 1000})
for
const array = [] for(let i = 0; i < 1000; i++){ array.push(undefined) }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
from
for
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 months ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36
Browser/OS:
Chrome 146 on Windows
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Test name
Executions per second
from
13553.2 Ops/sec
for
46402.9 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Measuring JavaScript performance is essential for developers to optimize their code and ensure it runs efficiently across different browsers and devices. The provided JSON represents a benchmark that tests the performance of two approaches: using `Array.from()` and creating an array with a traditional `for` loop. Let's break down each approach: **1. Using `Array.from()`** * The test case uses the `Array.from()` method to create an array of size 1000. * The purpose of this method is to provide a concise way to create arrays from iterables or other sources. Pros: * More concise and readable code compared to traditional loops. * Easier to maintain and modify. Cons: * Might not be supported in older browsers or environments that don't have modern JavaScript capabilities. * Can lead to slower performance due to the overhead of creating an array. **2. Traditional `for` loop** * The test case uses a traditional `for` loop to create an array of size 1000, with each iteration pushing an undefined value to the array. * This approach is more straightforward and widely supported across different browsers and environments. Pros: * More control over the creation process and can lead to better performance due to fewer overheads. * Widely supported across different browsers and environments. Cons: * Can be more verbose and less readable compared to `Array.from()`. * Might require additional error handling for null or undefined values. **Other considerations:** * Modern JavaScript engines, like V8 (used in Chrome), have optimized array creation methods that can lead to better performance. * The choice of approach ultimately depends on the specific use case and personal preference. If conciseness is a priority and performance is not critical, `Array.from()` might be a better choice. **Library usage:** None of the provided test cases explicitly uses any JavaScript libraries. **Special JS features or syntax:** Neither of the test cases uses special JavaScript features like async/await, Promises, or arrow functions. They are standard synchronous code snippets. **Other alternatives:** If you wanted to test more approaches or variations on these methods, some potential alternatives could be: * Using `Array.prototype.fill()` instead of `for` loops * Utilizing `Map` or `Set` data structures for array-like behavior without creating arrays * Comparing the performance of different array creation libraries like Lodash or Underscore.js Keep in mind that these alternatives would require additional test cases to cover a wider range of scenarios.
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