JavaScript Taskbook Level 3.4

Задание 1

Print to the console all numbers in the range from 10 to 1000 whose first digit is even.

Задание 2

Given some array, for example, like this:

javascript[1, 2, 3, 4, 5, 6]

Swap pairs of elements in this array:

javascript[2, 1, 4, 3, 6, 5]

Задание 3

The following object is given:

javascriptlet obj = {
  1: {
    1: 11,
    2: 12,
    3: 13,
  },
  2: {
    1: 21,
    2: 22,
    3: 23,
  },
  3: {
    1: 24,
    2: 25,
    3: 26,
  },
}

Find the sum of the elements of this object.