Run results for: Array item swapping, destructuring vs temp variable (throwaway destructuring)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36 Edg/135.0.0.0

Browser: Chrome 135

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Length 10 destructuring swap

25.4M/s

Length 10 temp swap

18.0M/s

Length 100 destructuring swap

11.3M/s

Length 100 temp swap

10.0M/s

Length 1000 destructuring swap

2.2M/s

Length 1000 temp swap

2.1M/s

View exact numbers

Test name	Executions per second
✓ Length 10 destructuring swap	25,410,890 Ops/sec
Length 10 temp swap	18,041,974 Ops/sec
Length 100 destructuring swap	11,254,193 Ops/sec
Length 100 temp swap	9,980,499 Ops/sec
Length 1000 destructuring swap	2,244,296 Ops/sec
Length 1000 temp swap	2,147,362 Ops/sec

Script Preparation code:

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);

    [
        array[swap1],
        array[swap2]
    ] = [
        array[swap2],
        array[swap1]
    ];
}

Tests:

Length 10 temp swap
tempSwap(new Array(10));
Length 10 destructuring swap
destructuringSwap(new Array(10));
Length 100 temp swap
tempSwap(new Array(100));
Length 100 destructuring swap
destructuringSwap(new Array(100));
Length 1000 temp swap
tempSwap(new Array(1000));
Length 1000 destructuring swap
destructuringSwap(new Array(1000));