[Solved] To get empty array

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The only time you return [] is when the condition (input[i] == 0) matches on any element.

However, given the name of the function you only want to skip such elements.

If and only if the argument contains no other elements but 0, return the empty array.

So the following modified code will work:

function countPositivesSumNegatives(input) {
  let count = 0;
  let positive = 0;
  let negative = 0;

  for (let i = 0; i < input.length; i++) {
    if (input[i] < 0) {
      negative += input[i];
    }
    if (input[i] > 0) {
      count++;
    }
  }
  positive = count; // Hoisted out of the loop. Unless your function contains more code, you do not need the 'count' variable at all.

  let seen_nonzero = ((positive !== 0) || (negative !== 0));
      // Flags whether a non-0 element is  present in your input.

  let a_r = 
      seen_nonzero 
          ? [positive, negative]
          : []
  ;
  return a_r
}

console.log(countPositivesSumNegatives([0, 0]));
console.log(countPositivesSumNegatives([1, 2, 3, -1, -3]));
console.log(countPositivesSumNegatives([-1, -2, 0, 1, 2]));

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solved To get empty array