countPositivesSumNegatives.js

/**
 * @param {number[]} input Массив целых чисел
 * @return {number[]}
 */
function countPositivesSumNegatives(input) {
  if (!Array.isArray(input) || (Array.isArray(input) && input.length === 0)) {
    return [];
  }

  let result = [0, 0];
  for (let i = 0; i < input.length; i++) {
    const item = input[i];
    
    if (item > 0) {
      result[0] += 1;
    } else {
      result[1] += item;
    }
  }
  return result;
}

countPositivesSumNegatives([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, -11, -12, -13, -14, -15]);
countPositivesSumNegatives([0, 2, 3, 0, 5, 6, 7, 8, 9, 10, -11, -12, -13, -14]);