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unshift vs push
(version: 0)
Comparing performance of:
unshift vs push
Created:
3 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var array = []; for(var i = 0; i < 100000; i++){array.push(Math.random());}
Tests:
unshift
let a = []; for(var i = 0; i < 100000; ++i) { a.unshift(i); }
push
let a = []; for(var i = 0; i < 100000; ++i) { a.push(i); }
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
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark definition and test cases to understand what is being tested. **Benchmark Definition** The benchmark definition represents a JavaScript microbenchmark that measures the performance difference between two approaches: using `unshift` versus `push`. The script preparation code creates an empty array, and then iterates 100,000 times, appending or prepending a random number to the array. **Options Compared** Two options are being compared: 1. **Push**: This is the standard way of adding elements to the end of an array in JavaScript. 2. **Unshift**: This method adds one or more elements to the beginning of an array. **Pros and Cons** * **Push**: Pros: + Faster execution time (as seen in the latest benchmark result) + More widely supported and used + Fewer memory allocations required * **Unshift**: Pros: + Can be useful for certain data structures or algorithms that require elements to be prepended + Can provide better cache locality and performance for some workloads Cons: * Slower execution time compared to `push` * More memory allocations required **Library** There is no specific library mentioned in the benchmark definition, as it only involves basic JavaScript syntax. **Special JS Features/Syntax** None are explicitly mentioned in this benchmark definition. However, it's worth noting that some browsers may have specific optimizations or extensions for certain features like `unshift` or `push`, which could affect the results of this benchmark. **Other Alternatives** If you want to explore alternative approaches, here are a few options: 1. **Array.prototype.splice**: This method can be used to replace an element at a specified index in the array. It's faster than `unshift` and `push` but may require more careful consideration of bounds checking. 2. **Buffer API**: If you're working with large arrays or performance-critical code, using the Buffer API (available in Node.js) can provide optimized memory allocation and caching benefits. 3. **Native WebAssembly Arrays**: For highly optimized, low-level performance, consider using WebAssembly arrays or libraries like WebAssembly-Array. These alternatives would require additional considerations for compatibility, syntax changes, and potential optimizations specific to your use case.
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