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unshift vs push and reverse
(version: 0)
Comparing performance of:
unshift vs push and reverse
Created:
5 years ago
by:
Guest
Go to the latest result
Tests:
unshift
let array = []; for (let i = 0; i < 200; i++) { array.unshift(i); }
push and reverse
let array = []; for (let i = 0; i < 200; i++) { array.push(i); } array.reverse()
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
unshift
push and reverse
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0
Browser/OS:
Firefox 140 on Linux
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=613937" width="100%" height="500px"></iframe>
push and reverse
1.2M/s
unshift
118K/s
View exact numbers
Test name
Executions per second
✓
push and reverse
1,208,900 Ops/sec
unshift
117,520 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and its test cases. **Benchmark Overview** The benchmark measures the performance difference between using `unshift()` and `push()` with subsequent reversal of an array in JavaScript. The benchmark prepares an empty array, iterates 200 times, adding a value to either the beginning (`unshift()`) or end (`push()`) of the array, and then reverses the array. **Options Compared** There are two main approaches being compared: 1. **Unshift**: Using `array.unshift(i)`, which adds an element to the beginning of the array. 2. **Push**: Using `array.push(i)`, followed by reversing the array with `array.reverse()`. **Pros and Cons of Each Approach** * **Unshift**: + Pros: May be faster for certain use cases, as it avoids the overhead of creating a temporary array during the push operation. + Cons: Reversing the array after pushing can lead to poor cache locality, reducing performance. Additionally, unshift() may allocate more memory than necessary if the array is large. * **Push**: + Pros: Faster and more efficient for reversing arrays after pushes, as it avoids the overhead of creating a temporary array. + Cons: May be slower due to the push operation itself. **Library/Functionality Used** There is no explicit library or functionality mentioned in the provided JSON. However, `array.unshift()` and `array.push()` are built-in JavaScript methods. **Special JS Feature/Syntax** No special JavaScript features or syntax are used in this benchmark. **Other Considerations** * The benchmark measures the performance difference between these two approaches, so a good understanding of performance optimization techniques is essential for interpreting the results. * This benchmark may not be representative of all scenarios, as it only tests a specific use case involving array operations. Other benchmarks might focus on different aspects, such as memory allocation or garbage collection. **Alternatives** For similar performance benchmarks: 1. **Micro-benchmarking frameworks**: Tools like Benchmark.js or js-benchmark can help create and run microbenchmarks. 2. **JavaScript performance profiling tools**: Instruments like Chrome DevTools' Performance tab or Node.js Inspector can provide detailed insights into JavaScript performance. 3. **Benchmarking platforms**: Websites like MeasureThat.net (the current benchmark) or GitHub's Code Golf challenge series offer a platform to share and compare benchmarks. Keep in mind that the specific context of this benchmark might be related to particular use cases, such as data processing or scientific computing.
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