JS (ES6): Filter array based on nested array attributes

Question

I have an array, which looks like this:

const persons = [
  {
    name: \"Joe\",
    animals: [
      {species: \"dog\", name: \"Bolt\"},
      {species: \"c         


        

Answer 1

This should do the trick

persons.filter((person) => {
    return person.animals.filter((animal) => {
        return animal.species === 'cat';
    }).length > 0;
});

Add the check on length, as filter returns an array, not a boolean.