LosTinCode

function countBy(x, n) {
    let arr = [];
    let sum = 0;
    
    for (let i = 1; i <= n; i++) {
        sum = x * i;
        arr[i - 1] = sum;
    }

    return arr;

}
countBy(1, 10);

.flexible-rates__content:hover div {
    color: #000000;
}
.flexible-rates__content:hover a {
    color: #FFFFFF;
   background-color: #000000;
}

.flexible-rates__content:hover .content__payment {
    color: red;
}

width: 100%;
height: 100%;
object-fit: cover;

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);

Math.min(...arr) // -100
Math.max(...arr) // 10

let sum = 0
  for() {
   ///
   sum += arr[i];
    }
    let avg = arr.length ? sum / arr.length : undefined;

function get_statistic(arr) {
	return {
  	edited: arr.filter(el => !el.edited).length,
    not_edited: arr.filter(el => el.edited).length,
    all: arr.length,
  }
}

console.log(get_statistic(allMessages));

const statsMeta = [
  { title: 'отредактированные', count: item => +item.edited },
  { title: 'неотредактированные', count: item => +!item.edited },
  { title: 'всего', count: () => 1 },
];

const statsData = allMessages.reduce((acc, n) => (
  statsMeta.forEach((m, i) => acc[i] += m.count(n)),
  acc
), Array(statsMeta.length).fill(0));

console.log(statsMeta.map((n, i) => `${n.title}: ${statsData[i]}`).join('\n'));

const resultArr = [];
for (let i = 0; i < arr.length; i++) {
  const item = arr[i];
  const obj = {};
  obj[item[0]] = item[1];
  resultArr.push(obj);
}

const resultArr = [];
for (let [prop, value] of arr) {
  const obj = { [prop]: value };
  resultArr.push(obj);
}