CodeWars: count the numbers of JS devs from Europe

CodeWars: count the numbers of JS devs from Europe.txt

ASSIGNMENT
_____________________________

You will be given an array of objects (hashes in ruby) representing data about developers 
who have signed up to attend the coding meetup that you are organising for the first time.
Your task is to return the number of JavaScript developers coming from Europe.
If, there are no JavaScript developers from Europe then your function should return 0.

Notes:

    The format of the strings will always be Europe and JavaScript.
    All data will always be valid and uniform as in the example above. 
_____________________________

SOLUTION
_____________________________

function countDevelopers(list) {
  return list.filter((obj) => obj.continent === 'Europe' && obj.language === 'JavaScript').length;
};

countDevelopers([
  { firstName: 'Noah', lastName: 'M.', country: 'Switzerland', continent: 'Europe', age: 19, language: 'JavaScript' },
  { firstName: 'Maia', lastName: 'S.', country: 'Tahiti', continent: 'Oceania', age: 28, language: 'JavaScript' },
  { firstName: 'Shufen', lastName: 'L.', country: 'Taiwan', continent: 'Asia', age: 35, language: 'HTML' },
  { firstName: 'Sumayah', lastName: 'M.', country: 'Tajikistan', continent: 'Asia', age: 30, language: 'CSS' }
]);