[рони]

jaroslav.tavgen,

const multiply = (...arg) => {
    let n = 1;
    return arg.reduce((a, b) => {
        b = b.toString().split('.');
        if (b[1]) n *= Math.pow(10, b[1].length);
        return a *= b.join('');

    }, 1) / n
}
alert(multiply(-8.87, -8.87));
alert(multiply(-8.87, -8.87, -8.87, -8.87));