JavaScript Taskbook Level 3.6

Задание 1

Given an array of numbers, remove numbers from it that have more than three digits.

Задание 2

Given a number, for example, like this:

javascriptlet num = 12345;

Check that all digits of this number are greater than zero.

Задание 3

Given some array, for example, like this:

javascript[123, 456, 789]

Merge all the elements of this array into one array, splitting them character by character:

javascript[1, 2, 3, 4, 5, 6, 7, 8, 9]

Задание 4

The following structure is given:

javascriptlet data = [
  {
    1: 11,
    2: 12,
    3: 13,
  },
  {
    1: 21,
    2: 22,
    3: 23,
  },
  {
    1: 24,
    2: 25,
    3: 26,
  },
];

Find the sum of the elements of this structure.