Take received filters params and return doctors who fit within the criteria (UNION/OR not AND)

filterDoctors.js

filterDoctors = (doctors, filters) => {
  let filteredDoctors = [];
  if (filters.gender.length > 0) {
    filteredDoctors.concat(
      filters.gender.map((gender) =>
        filteredDoctors.filter((doctor) => doctor.gender == gender)
      )
    );
  }
  if (filters.specs.length > 0) {
    filteredDoctors.concat(
      filters.specs.map((spec) =>
        doctors.filter((doctor) => doctor.specializations == spec)
      )
    );
  }
  return filteredDoctors.filter(onlyUnique);
};