Both approaches give the same result. What's the difference between declarative and imperative style?

const numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

// Podejście imperatywne
let sum = 0;
for (let i = 0; i < numbers.length; i++) {
  if (numbers[i] % 2 === 0) {
    sum += numbers[i] * 2;
  }
}

// Podejście deklaratywne
const result = numbers
  .filter(n => n % 2 === 0)
  .map(n => n * 2)
  .reduce((acc, n) => acc + n, 0);