JavaScript Task Book Level 3.5

Задание 1

Given a text with words. Write into an array all words that begin with the letter 'a'.

Задание 2

Given an array of numbers, leave in it only those numbers that are divisible by 5.

Задание 3

Given an array of numbers, leave in it only those numbers that contain the digit zero.

Задание 4

Given an array of numbers, check that it contains a number that contains the digit 3.

Задание 5

Given a certain number:

javascript35142

Sort the digits of this number. In our case, we should get the following:

javascript12345

Задание 6

Write a program that will generate the following string:

javascript'-1-2-3-4-5-'

Задание 7

The following object is given:

javascriptlet obj = {
  1: {
    1: {
      1: 111,
      2: 112,
      3: 113,
    },
    2: {
      1: 121,
      2: 122,
      3: 123,
    },
  },
  2: {
    1: {
      1: 211,
      2: 212,
      3: 213,
    },
    2: {
      1: 221,
      2: 222,
      3: 223,
    },
  },
  3: {
    1: {
      1: 311,
      2: 312,
      3: 313,
    },
    2: {
      1: 321,
      2: 322,
      3: 323,
    },
  },
}

Find the sum of the elements of this object.