پست CHALLENGE

CHALLENGE const nums = [1, 2, 3, 4, 5]; const result = nums .filter(n => n % 2 !== 0) .map(n => n ** 2) .reduce((acc, n) => acc + n, 0); const arr = [10, , 20, undefined, 30]; const mapped = arr.map(x => x * 2); console.log(result, mapped);