Justify every early return

swap.ts

/**
 * Swaps the items in the array at `indexA` and `indexB`. If either `indexA` or
 * `indexB` are less than `0`, more-than-or-equal-to the length of `array`, or
 * not an integer, then no action is taken.
 * 
 * @param array Array whose items should be swapped.
 * @param indexA Index of one item to swap.
 * @param indexB Index of the other item to swap.
 */
const swap = (array: any[], indexA: number, indexB: number) => {

    if (indexA === indexB) {
        return; // no need to swap, items already in desired place.
    }

    const { length }  = array;

    if (
        indexA < 0
        || indexA >= length
        || Math.trunc(indexA) !== indexA
        || indexB < 0
        || indexB >= length
        || Math.trunc(indexB) !== indexB
    ) {

        return console.warn(
            "can't swap, indices make no sense",
            { indexA, indexB, length },
        );

    }

    [array[indexA], array[indexB]] = [array[indexB], array[indexA]];

};