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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Length 10 destructuring swap

44.5M/s

Length 10 temp swap

34.0M/s

Length 100 destructuring swap

26.2M/s

Length 100 temp swap

22.8M/s

Length 1000 destructuring swap

4.7M/s

Length 1000 temp swap

4.6M/s

View exact numbers

Test name	Executions per second
✓ Length 10 destructuring swap	44,478,964 Ops/sec
Length 10 temp swap	34,021,492 Ops/sec
Length 100 destructuring swap	26,239,674 Ops/sec
Length 100 temp swap	22,783,310 Ops/sec
Length 1000 destructuring swap	4,740,664 Ops/sec
Length 1000 temp swap	4,556,348 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));