Сергей Соколов

const QA = [
  {
    q: ['Привет', 'Hi', 'Здарова', 'Ы'],
    a: ['Привет', 'Здравствуйте', 'Доброго времени суток'],
  },
  {
    q: ['Как дела?', 'Как жизнь?', 'Как день прошёл?', 'Как настроение?'],
    a: ['Хорошо', 'Отлично', 'Лучше всех, надеюсь и у вас так же'],
  },
];

1. получили вопрос
   
2. нашли, есть ли среди QA подходящая пара, где q.includes(вопрос)
   
3. если есть – берём из той же пары свойство a и его случайный элемент
   

function answer(questionText, QA) {
  if (!questionText || questionText.length === 0) {
    return 'Пустой вопрос - пустой ответ';
  }

  const pair = QA.find(pair => pair.q.map(text => text.toLowerCase()).includes(questionText.toLowerCase()));
  if (!pair) {
    return 'Даже и не знаю, что ответить!..';
  }

  const randomIndex = Math.floor(Math.random() * pair.a.length);
  return pair.a[randomIndex];
}

// использование
answer('Ы', QA);  // Привет

The traversal order, as of modern ECMAScript specification, is well-defined and consistent across implementations.

Within each component of the prototype chain, all non-negative integer keys (those that can be array indices) will be traversed first in ascending order by value, then other string keys in ascending chronological order of property creation.

const obj = { a: "AAA", b: "BBB", "outer space": "UFO" };

let name = "a";
console.log( obj[name] ); // "AAA"

name = "outer space";
console.log( obj[name] ); // "UFO"

const news = (new URL(document.location)).searchParams.get('news');
if (news) document.location.hash = news;

for (let key in objectEmployee) {

objectEmployee.key['age']

const filters = {
  age: v => v >= 25,
  education: v => v === 'higher',
  experience: v => v >= 1,
};

const employee = {};
const defaultDescriptor = { writable: true, enumerable: true, configurable: true };
Object.defineProperties(employee, {
  name: { ...defaultDescriptor, value: 'Dmitriy', writable: false },
  age: { ...defaultDescriptor, value: 21 },
  education: { ...defaultDescriptor, value: 'higher' },
  experience: { ...defaultDescriptor, value: 0 },
});

const hireNewEmployee = (employee, filters) => {
  const errors = [];
  Object.entries(filters).forEach(([name, func]) => {
    if (!func(employee[name])) {
      errors.push(name);
    }
  });

  return errors.length
    ? `Not hired: sorry we cannot hire you. Here is why: ${errors.join(', ')}`
    : 'You are Hired! Congrats!';
};

hireNewEmployee(employee, filters);
// "Not hired: sorry we cannot hire you. Here is why: age, experience"

document.addEventListener('click', ({ target }) => {
  if (!target.classList.contains('button')) return; // не тот клик
  target.classList.toggle('active');
});

const isEmpty = obj => Object.keys(obj).length <= 2;

console.log( isEmpty({ a: "AAA" }) ? 'object is empty' : 'object is full of properties' );
// выведет "object is empty"

console.log( isEmpty({ a: "AAA", b: "BB", c: "C" }) ? 'object is empty' : 'object is full of properties' );
// выведет "object is full of properties"

<span class="animals" data-allowed="{{$cabin->HasAnimals}}">
  {{$cabin->HasAnimals?Translate::GetTranslation('Animals Allowed'):Translate::GetTranslation('Animals Not Allowed')}}
</span>

const span = document.querySelector('span.animals');
const isAnimalsAllowed = !!span.dataset.allowed;