test.js

const PET_TYPES_MAP = {
  cat: {
    male: "Кот",
    female: "Кошка",
    freakale: undefined,
    anyOther: undefined
  },
  rabbit: {
    male: "Кролик",
    female: "Крольчиха",
  },
};

const data = [
  { id: 4, petType: "cat", name: "Сенька", sex: "freakale" },
  { id: 2, petType: "cat", name: "Мешаня", sex: "male" },
  { id: 1, petType: "rabbit", name: "Котя", sex: "female" },
  { id: 3, petType: "cat", name: "Нюся", sex: "female" },
  { id: 5, petType: "human", name: "Лукашик", sex: "male" },
];

const filterByExistedPetType = (item) => {
  if (PET_TYPES_MAP[item.petType] === undefined) {
    return false;
  }
  return true;
};

function mapToLocaleRuString(item) {
  const petTypeRus = PET_TYPES_MAP[item.petType][item.sex] || "неизвестный пол";
  return item.name + " это " + petTypeRus;
};

function myStraightFunction(arg1, arg2) {
  return arg1 + arg2
}

const myLambdaFunction = (arg1, arg2) => arg1 + arg2;

const result = data
  .filter(filterByExistedPetType)
  .map(mapToLocaleRuString)
  .sort();


  const myNumbers = [1,2,3,4,5]
  myNumbers.map(function(item) {
    return item * 2
  })
  myNumbers.map((item) => item * 2);

result