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

You can use filter() with some() method to check if some of the objects in animals array has species == cat.

const persons = [{"name":"Joe","animals":[{"species":"dog","name":"Bolt"},{"species":"cat","name":"Billy"}]},{"name":"Bob","animals":[{"species":"dog","name":"Snoopy"}]}]

const result = persons.filter(({animals}) => {
  return animals.some(({species}) => species == 'cat')
})

console.log(result)