SOURCE

function setNumOne(...numbers) {
    return numbers.reduce((preVal, currentVal)=> preVal + currentVal);
}
console.info(setNumOne(10,20,3,4));

function setNumTwo(oneNum, twoNum, ...numbers) {
    console.log(oneNum);
    console.info(twoNum);
    console.log(numbers.reduce((preVal,currentVal)=> {return preVal+currentVal}));
}
setNumTwo(10,23,3,2,6,7);