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Array extend 2
(version: 0)
Comparing performance of:
Push single vs Push spread vs Total spread
Created:
5 years ago
by:
Guest
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Script Preparation code:
start = 0 stop = 10000 x = [] for(var i = 0; i < 10000; i++) { x.push(i) }
Tests:
Push single
y = [] x.forEach(e => y.push(e))
Push spread
y = [] y = y.push(...x)
Total spread
y = [] y = [...y, ...x]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
Push single
Push spread
Total spread
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to help explain the JavaScript microbenchmark on MeasureThat.net. **Benchmark Overview** The benchmark measures the performance of three different approaches for extending an array in JavaScript: 1. `forEach` loop with `push` 2. Spread operator (`...`) with `push` 3. Array spread operator (`[...y, ...x]`) **Approaches and their pros/cons** ### 1. `forEach` loop with `push` This approach iterates over the array using a `forEach` loop and pushes each element to a new array. Pros: * Simple and easy to understand * Works well for small arrays Cons: * Can be slow for large arrays due to the overhead of the `forEach` loop * Creates a new array, which can lead to memory allocation issues if the original array is large **2. Spread operator (`...`) with `push`** This approach uses the spread operator to create a new array by spreading the elements of the original array into a new array. Pros: * Faster than the `forEach` loop approach * More efficient than creating a new array from scratch Cons: * Requires support for the spread operator (introduced in ECMAScript 2015) * May have performance implications if the original array is very large **3. Array spread operator (`[...y, ...x]`)** This approach uses the array spread operator to create a new array by spreading the elements of both arrays into one. Pros: * Fast and efficient * Does not require creating a new array from scratch Cons: * Requires support for the array spread operator (introduced in ECMAScript 2015) * May have performance implications if the original arrays are very large **Library and Special JS Features** There is no library mentioned in the benchmark. However, it's worth noting that some browsers may use specialized JavaScript engines or optimizations that can affect the results of the benchmark. None of the approaches rely on any special JavaScript features beyond the standard `forEach` loop and array spread operators. **Other Alternatives** If you need to extend an array, there are other approaches you could consider: * Using a library like Lodash's `each` function * Using a specialized array extension function (e.g., `Array.prototype.pushAll`) * Using a different data structure altogether (e.g., using a linked list or a more efficient data structure for large arrays) Keep in mind that the best approach will depend on your specific use case and requirements. The MeasureThat.net benchmark provides a useful starting point, but you may need to experiment with different approaches to find the one that works best for your needs.
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