export function mutate(out) {
    out[0] = 1;
    out[1] = 2;
    out[2] = 3;

    return out;
}

export const myFunc = (function () {
    const temp = [0, 0, 0];

    return function (out) {
        const scaling = temp;
        mutate(scaling);

        out[0] = 1 / scaling[0];
        out[1] = 1 / scaling[1];
        out[2] = 1 / scaling[2];

        return out;
    };
})();

const out = [1, 2, 3];
myFunc(out);