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const a = {};
const b = { key: "b" };
const c = { key: "c" };

a[b] = 123;
a[c] = 456;

console.log(a[b]);

div {
  width: 100px;
  height: 100px;
  background: red;
  display: none;
}
/* Будет ли элемент занимать место на странице? */

async function getData() {
  return "Hello";
}
console.log(getData());

const a = [1, 2, 3];
const b = a.map(num => {
  if (num > 1) return num;
});
console.log(b);

div {
  display: flex;
  justify-content: center;
}
/* Как будут выровнены элементы? */

const user = { name: "Alice" };
Object.freeze(user);
user.name = "Bob";
console.log(user.name);

const bird = {
  size: 'small'
};

const mouse = {
  name: 'Mickey',
  small: true
};

console.log(mouse[bird.size]);

.parent {
  display: flex;
  height: 200px;
}
.child {
  height: 50%;
  flex-grow: 1;
}
/* Какая высота будет у .child? */

let count = 0;
const nums = [0, 1, 2, 3];

nums.forEach(num => {
  if (num) count += 1;
});

console.log(count);

console.log(1);
setTimeout(() => console.log(2), 0);
Promise.resolve().then(() => console.log(3));
console.log(4);