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array spread vs array push
(version: 0)
Comparing performance of:
spread vs push
Created:
5 years ago
by:
Guest
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Tests:
spread
let pageButtons = []; for (let pageNumber = 1; pageNumber <= 10000; pageNumber += 1) { pageButtons = [ ...pageButtons, pageNumber ] }
push
const pageButtons = []; for (let pageNumber = 1; pageNumber <= 10000; pageNumber += 1) { pageButtons.push( pageNumber ); }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
spread
push
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 its various components. **Benchmark Overview** The benchmark is designed to compare the performance of two approaches: using the spread operator (`...`) to add elements to an array, versus using the `push()` method to append elements to an array. The benchmark measures the execution time for both approaches on a large dataset (10,000 iterations). **Options Compared** Two options are compared: 1. **Spread Operator (`...`)**: This approach uses the spread operator to create a new array by spreading the existing array and adding new elements. 2. **Push Method (`push()`)**: This approach uses the `push()` method to append new elements to the end of an existing array. **Pros and Cons** * **Spread Operator (```...```)** + Pros: - More concise and expressive syntax - Can be more efficient in some cases, as it avoids creating a new array reference + Cons: - Can lead to unexpected behavior if not used carefully (e.g., modifying the original array) - May incur additional overhead due to string interpolation * **Push Method (`push()`)** + Pros: - More traditional and well-established syntax - Generally safer than using spread operators, as it doesn't modify the original array + Cons: - Less concise and expressive syntax compared to spread operators **Library Usage** There is no explicit library usage mentioned in the benchmark. However, the benchmark may rely on built-in JavaScript features or libraries that are not explicitly stated. **Special JS Feature/Syntax** The benchmark uses a common JavaScript feature: iteration using `for` loops with incrementing indices (`pageNumber += 1`). This syntax is widely supported across most modern browsers and environments. **Other Alternatives** If you wanted to optimize this benchmark, you could consider the following alternatives: * Using `Array.prototype.concat()` or `Array.prototype.pushAll()` instead of spread operators * Utilizing more advanced array methods like `Array.prototype.reduce()` or `Array.prototype.map()` * Using WebAssembly or other low-level optimizations for better performance * Profiling and analyzing memory allocation patterns to optimize memory usage Keep in mind that the best approach depends on your specific use case, target audience, and performance requirements. **Benchmark Preparation Code** The provided benchmark preparation code is minimal and focuses on setting up the testing environment. You can modify this code to include additional setup or test cases as needed. If you have any further questions about this benchmark or would like more information on optimizing JavaScript performance, feel free to ask!
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