Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
unshift vs swapping
(version: 0)
Comparing performance of:
unshift vs swapping
Created:
6 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var arr = [...Array(10000)].map((_,i) => i)
Tests:
unshift
arr.unshift(arr.splice(500,1).shift())
swapping
arr.sort((a,b) => a === 500 ? -1 : 0)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
unshift
swapping
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
This benchmark does not have any results yet. Be the first one
to run it!
Autogenerated LLM Summary
(model
gemma2:9b
, generated one year ago):
This benchmark on MeasureThat.net compares two methods for manipulating an array in JavaScript: `unshift` and swapping elements using `sort`. **Here's the breakdown:** * **Setup:** The benchmark starts by creating an array `arr` containing 10,000 sequential numbers (0 to 9999). * **Test Cases:** * **`unshift` Approach:** This test uses `unshift` to insert the element removed from index 500 using `splice`. It first extracts the element at index 500 with `splice(500, 1)`, then shifts it out of the array using `.shift()`, and finally inserts it back into the beginning of the array using `unshift()`. * **`swapping` Approach:** This test uses `sort` to swap an element. It sorts the array by comparing each element (`a`) to the target value (500). If `a` is 500, it's placed before other elements (`-1`). **Pros and Cons:** * **`unshift`:** * **Con:** While potentially simpler to understand, it involves multiple operations: `splice`, `.shift()`, and `unshift`. Each operation can introduce overhead. * **Pro:** In some cases, if the element you're inserting is frequently used at the beginning of the array, this approach might be more efficient due to the direct insertion. * **`swapping`:** * **Con:** Sorting a large array using `sort`, even with a specific comparison, can be computationally expensive if it triggers many re-arrangments within the array. * **Pro:** It's potentially more concise and might be more efficient for situations where you need to rearrange multiple elements in a sorted order. **Other Considerations:** * **Array Size:** The impact of these approaches depends heavily on the size of the array. For small arrays, the overhead of each operation might be negligible. However, for large arrays, the differences in performance become more significant. * **Specific Use Case:** The best approach depends on your specific needs. * If you need to frequently insert an element at the beginning, `unshift` might be simpler. * If you need to sort or rearrange multiple elements based on a specific criteria, `sort` could be more efficient. **Alternatives:** * **Libraries:** Libraries like Lodash provide optimized functions for array manipulation that might offer better performance than built-in methods. For example, Lodash's `_.pullAt` function could be used to efficiently remove and return elements from an array. * **Custom Algorithms:** If you have a very specific use case, you might explore writing custom algorithms tailored to your needs. Remember that benchmark results can vary based on the hardware, software environment, and other factors. It's important to run benchmarks with different configurations and consider the context of your application when choosing the most suitable approach.
Related benchmarks:
Array .push() vs .unshift() multiple
unshift vs sorting
myarr unshift vs push + reverse (small array)
myarr unshift vs push + reverse (small array)2
Comments
Confirm delete:
Do you really want to delete benchmark?