continents.js

// You will be given a sequence of objects (associative arrays in PHP) representing data about developers who have signed up to attend the next coding meetup that you are organising.

// Your task is to return:

// true if all of the following continents / geographic zones will be represented by at least one developer: 'Africa', 'Americas', 'Asia', 'Europe', 'Oceania'.
// false otherwise.

function allContinents(list) {
  return ['Africa', 'Americas', 'Asia', 'Europe', 'Oceania'].every((x) =>
    list.some((y) => x == y.continent)
  );
}