JSON-to-data conversion in JavaScript

Using the JSON.parse method, you can convert JSON to a JavaScript data structure. Let's look at an example.

Let's say we have a string containing an array in JSON format:

javascriptlet json = '[1, 2, 3, 4, 5, "a", "b"]';

Let's convert our string to an array:

javascriptlet arr = JSON.parse(json);

If the string contains invalid JSON, our method will throw an error:

javascriptlet json = '[1, 2, 3, 4, 5,]'; // invalid JSON
let arr = JSON.parse(json);    // throws an error

Задание 1

Given a JSON string containing an array of numbers:

javascriptlet json = '[1,2,3,4,5]';

Convert this string to a real JavaScript array and find the sum of the numbers of this array.

Задание 2

Given a JSON string containing an object with data:

javascriptlet json = `{
  "data1": [1,2,3],
  "data2": [4,5,6],
  "data3": [7,8,9]
}`;

Find the sum of numbers from the given data.

Задание 3

Given a JSON string containing usernames:

javascriptlet json = '["user1","user2","user3","user4","user5"]';

Output these names as an ul list.

Задание 4

Given a JSON string, containing an array with employees data:

javascriptlet json = `[
  {
    "name": "user1",
    "age": 25,
    "salary": 1000
  },
  {
    "name": "user2",
    "age": 26,
    "salary": 2000
  },
  {
    "name": "user3",
    "age": 27,
    "salary": 3000
  }
]`;

Display these employees in the form of an HTML table.