sysoev-dev

function extractNum(str) {
  const match = str.match(/\d+/);
  return parseInt(match[0], 10);
}

function calcSum(arr) {
  const flatArr = arr.flat(2);
  let sum = 0;

  flatArr.forEach((item) => {

sysoev-dev

function clone(object) {
  let newObject = {}

  for (let prop in object) {
    newObject[prop] = (typeof object[prop] !== 'object') ? object[prop] : clone(object[prop])
  }
return newObject;