gistfile1.txt

let contacts = [];
_.filter(phoneContacts, (contact) => {
  _.filter(contact.phoneNumbers, (number) => {
    if (number.digits.indexOf(searchString) > -1 || contact.fullName.indexOf(searchString) > -1) {
      let mutableContact = _.clone(contact);
      contacts.push(mutableContact);
    }
  });
});
return contacts;