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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_5_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.5 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 17

Operating system: iOS 17.5.1

Device Platform: Mobile

Date tested: 2 years ago

Length 10 destructuring swap

3.0M/s

Length 10 temp swap

2.9M/s

Length 100 destructuring swap

2.5M/s

Length 100 temp swap

2.5M/s

Length 1000 destructuring swap

1.2M/s

Length 1000 temp swap

1.2M/s

View exact numbers

Test name	Executions per second
✓ Length 10 destructuring swap	2,961,273 Ops/sec
Length 10 temp swap	2,938,327 Ops/sec
Length 100 destructuring swap	2,477,065 Ops/sec
Length 100 temp swap	2,451,464 Ops/sec
Length 1000 destructuring swap	1,177,106 Ops/sec
Length 1000 temp swap	1,162,430 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);

    return [
        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));