Kata

You will be given an array of objects representing data about developers who have signed up to attend the next web development meetup that you are organising. Three programming languages will be represented: Python, Ruby and JavaScript.

Your task is to return either:

• true if the number of meetup participants representing any of the three programming languages is ** at most 2 times higher than the number of developers representing any of the remaining programming languages**; or
• false otherwise.

For example, given the following input array:

var list1 = [
  { firstName: 'Daniel', lastName: 'J.', country: 'Aruba', continent: 'Americas', age: 42, language: 'Python' },
  { firstName: 'Kseniya', lastName: 'T.', country: 'Belarus', continent: 'Europe', age: 22, language: 'Ruby' },
  { firstName: 'Sou', lastName: 'B.', country: 'Japan', continent: 'Asia', age: 43, language: 'Ruby' },
  { firstName: 'Hanna', lastName: 'L.', country: 'Hungary', continent: 'Europe', age: 95, language: 'JavaScript' },
  { firstName: 'Jayden', lastName: 'P.', country: 'Jamaica', continent: 'Americas', age: 18, language: 'JavaScript' },
  { firstName: 'Joao', lastName: 'D.', country: 'Portugal', continent: 'Europe', age: 25, language: 'JavaScript' }
];

list1 = [
    { 'firstName': 'Daniel', 'lastName': 'J.', 'country': 'Aruba', 'continent': 'Americas', 'age': 42, 'language': 'Python' },
    { 'firstName': 'Kseniya', 'lastName': 'T.', 'country': 'Belarus', 'continent': 'Europe', 'age': 22, 'language': 'Ruby' },
    { 'firstName': 'Sou', 'lastName': 'B.', 'country': 'Japan', 'continent': 'Asia', 'age': 43, 'language': 'Ruby' },
    { 'firstName': 'Hanna', 'lastName': 'L.', 'country': 'Hungary', 'continent': 'Europe', 'age': 95, 'language': 'JavaScript' },
    { 'firstName': 'Jayden', 'lastName': 'P.', 'country': 'Jamaica', 'continent': 'Americas', 'age': 18, 'language': 'JavaScript' },
    { 'firstName': 'Joao', 'lastName': 'D.', 'country': 'Portugal', 'continent': 'Europe', 'age': 25, 'language': 'JavaScript' }
    ]

       01  List.
          03  ListLength      pic 9(2) value 6.
          03  dev1.
              05 FirstName    pic a(9)  value 'Daniel'.
              05 LastName     pic x(2)  value 'J.'.
              05 Country      pic a(24) value 'Aruba'.
              05 Continent    pic a(8)  value 'Americas'.
              05 Age          pic 9(3)  value 42.
              05 Language     pic a(10) value 'Python'.
          03  dev2.
              05 FirstName    pic a(9)  value 'Kseniya'.
              05 LastName     pic x(2)  value 'T.'.
              05 Country      pic a(24) value 'Belarus'.
              05 Continent    pic a(8)  value 'Europe'.
              05 Age          pic 9(3)  value 29.
              05 Language     pic a(10) value 'Ruby'.
          03  dev3.
              05 FirstName    pic a(9)  value 'Sou'.
              05 LastName     pic x(2)  value 'B.'.
              05 Country      pic a(24) value 'Japan'.
              05 Continent    pic a(8)  value 'Asia'.
              05 Age          pic 9(3)  value 43.
              05 Language     pic a(10) value 'Ruby'.
          03  dev4.
              05 FirstName    pic a(9)  value 'Hanna'.
              05 LastName     pic x(2)  value 'L.'.
              05 Country      pic a(24) value 'Hungary'.
              05 Continent    pic a(8)  value 'Europe'.
              05 Age          pic 9(3)  value 29.
              05 Language     pic a(10) value 'JavaScript'.
          03  dev5.
              05 FirstName    pic a(9)  value 'Jayden'.
              05 LastName     pic x(2)  value 'P.'.
              05 Country      pic a(24) value 'Jamaica'.
              05 Continent    pic a(8)  value 'Americas'.
              05 Age          pic 9(3)  value 42.
              05 Language     pic a(10) value 'JavaScript'.
          03  dev6.
              05 FirstName    pic a(9)  value 'Joao'.
              05 LastName     pic x(2)  value 'D.'.
              05 Country      pic a(24) value 'Portugal'.
              05 Continent    pic a(8)  value 'Europe'.
              05 Age          pic 9(3)  value 65.
              05 Language     pic a(10) value 'JavaScript'.

your function should return false as the number of JavaScript developers (3) is 3 times higher than the number of Python developers (1). It can't be more than 2 times higher to be regarded as language-diverse.

Notes:

• The strings representing all three programming languages will always be formatted in the same way (e.g. 'JavaScript' will always be formatted with upper-case 'J' and 'S'.
• The input array will always be valid and formatted as in the example above.
• Each of the 3 programming languages will always be represented.
  
  
  
  
  

This kata is part of the Coding Meetup series which includes a number of short and easy to follow katas which have been designed to allow mastering the use of higher-order functions. In JavaScript this includes methods like: forEach, filter, map, reduce, some, every, find, findIndex. Other approaches to solving the katas are of course possible.

Here is the full list of the katas in the Coding Meetup series:

Coding Meetup #1 - Higher-Order Functions Series - Count the number of JavaScript developers coming from Europe

Coding Meetup #2 - Higher-Order Functions Series - Greet developers

Coding Meetup #3 - Higher-Order Functions Series - Is Ruby coming?

Coding Meetup #4 - Higher-Order Functions Series - Find the first Python developer

Coding Meetup #5 - Higher-Order Functions Series - Prepare the count of languages

Coding Meetup #6 - Higher-Order Functions Series - Can they code in the same language?

Coding Meetup #7 - Higher-Order Functions Series - Find the most senior developer

Coding Meetup #8 - Higher-Order Functions Series - Will all continents be represented?

Coding Meetup #9 - Higher-Order Functions Series - Is the meetup age-diverse?

Coding Meetup #10 - Higher-Order Functions Series - Create usernames

Coding Meetup #11 - Higher-Order Functions Series - Find the average age

Coding Meetup #12 - Higher-Order Functions Series - Find GitHub admins

Coding Meetup #13 - Higher-Order Functions Series - Is the meetup language-diverse?

Coding Meetup #14 - Higher-Order Functions Series - Order the food

Coding Meetup #15 - Higher-Order Functions Series - Find the odd names

Coding Meetup #16 - Higher-Order Functions Series - Ask for missing details