questioner1

let arrOfArr = [
  [1, 2, 3, 4],
  [10, 20, -10, -20],
];

function worker(arr) {
  let sum = 0;

  arr = arr.flat(Infinity);

  for (let i = 0; i < arr.length; i++) {
    sum += arr[i];
  }

  return sum;
}
worker(arrOfArr);

function makeWork(arrOfArr, func) {
  let max = 0;

  for (let i = 0; i < arrOfArr.length; i++) {
    let sum = func(arrOfArr[i]); // примерно так
    if (max > sum) {
      max = sum;
    }
  }

  return max;
}

makeWork(arrOfArr, worker);