const num = 123.456;
console.log(num.toFixed(2), num.toPrecision(4));

const arr = ['a', 'b', 'c'];
const iterator = arr.values();
console.log(iterator.next().value, iterator.next().value);

.button {
  border: 2px solid blue;
  outline: 2px solid red;
  outline-offset: 5px;
}

const btn = document.createElement('button');
btn.textContent = 'Click';
btn.onclick = () => console.log('A');
btn.addEventListener('click', () => console.log('B'));

const arr = [1, 2, 3, 4, 5];
const first = arr.shift();
const last = arr.pop();
console.log(first + last, arr.length);

.element {
  width: 300px;
  overflow-x: auto;
  white-space: nowrap;
}

const text = '10';
const num1 = +text;
const num2 = Number(text);
console.log(num1 === num2, typeof num1);

const date = new Date('2024-01-15');
const day = date.getDay();
const dayOfMonth = date.getDate();
console.log(day, dayOfMonth);

.element {
  mix-blend-mode: multiply;
  background: red;
}

const input = document.querySelector('input');
const hasValue = input.value.length > 0;
const isValid = input.checkValidity();
console.log(typeof hasValue, typeof isValid);