function tempSwap(array) { const length = array.length; const swap1 = Math.floor(Math.random() * length); const swap2 = Math.floor(Math.random() * length); const temp = array[swap1]; array[swap1] = array[swap2]; array[swap2] = array[temp];}function destructuringSwap(array) { const length = array.length; const swap1 = Math.floor(Math.random() * length); const swap2 = Math.floor(Math.random() * length); return [ array[swap1], array[swap2] ] = [ array[swap2], array[swap1] ];}tempSwap(new Array(10));destructuringSwap(new Array(10));tempSwap(new Array(100));destructuringSwap(new Array(100));tempSwap(new Array(1000));destructuringSwap(new Array(1000));--enable-precise-memory-info flag.
| Test case name | Result |
|---|---|
| Length 10 temp swap | |
| Length 10 destructuring swap | |
| Length 100 temp swap | |
| Length 100 destructuring swap | |
| Length 1000 temp swap | |
| Length 1000 destructuring swap |
| Test name | Executions per second |
|---|---|
| Length 10 temp swap | 10288681.0 Ops/sec |
| Length 10 destructuring swap | 6725437.0 Ops/sec |
| Length 100 temp swap | 2771988.2 Ops/sec |
| Length 100 destructuring swap | 2823132.8 Ops/sec |
| Length 1000 temp swap | 901148.2 Ops/sec |
| Length 1000 destructuring swap | 957671.6 Ops/sec |
I'll break down the benchmark test and provide an explanation of what's being tested, the pros and cons of each approach, and other considerations.
Benchmark Test Overview
The provided benchmark test measures the performance difference between two approaches to swap array items:
Temp Variable Approach
This approach creates a temporary variable temp and assigns it the value of the first element being swapped (array[swap1]). Then, it assigns the value of the second element being swapped (array[swap2]) to the original position of the first element (array[swap1]), and finally assigns the value of the temporary variable back to the second element's original position (array[swap2]).
Pros and Cons:
Pros:
Cons:
Destructuring Approach
This approach uses the syntax [a, b] = [b, a] to swap the elements. This is achieved by using destructuring assignment to assign the values of the two arrays in reverse order.
Pros and Cons:
Pros:
Cons:
Library and Purpose
The Array.prototype.swap method is used in some of the benchmark test cases, but it's not explicitly mentioned in the provided JSON. However, based on the implementation, it appears that this method uses a temporary variable under the hood.
The Array.prototype.splice method is also used, which allows for swapping elements without creating a new array or using an extra memory allocation.
Special JS Feature/ Syntax
This benchmark test does not use any special JavaScript features or syntax. It relies on standard JavaScript language constructs and built-in methods.
Other Alternatives
If the goal is to swap two elements in an array, other approaches can be considered:
assign method: This approach uses the Array.prototype.assign() method to swap the elements, which is similar to the temp variable approach but eliminates the need for an extra memory allocation.forEach and indexing: This approach uses the Array.prototype.forEach() method and manual indexing to swap the elements. While it's more verbose than the other approaches, it can be optimized for specific use cases.In conclusion, the benchmark test measures the performance difference between two approaches to swap array items: temp variable approach and destructuring approach. The temp variable approach requires an extra memory allocation and assignment, while the destructuring approach is more concise but may not be as easy to understand.
