Count of positives sum of negatives.js

// Given an array of integers.

// Return an array, where the first element is the count of positives 
// numbers and the second element is sum of negative numbers.

// If the input array is empty or null, return an empty array.

// Example
// For input [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, -11, -12, -13, -14, -15], 
// you should return [10, -65].

///////////// Solution //////////////

function countPositivesSumNegatives(input) {
    var p = 0;
    var n = 0;
    if(input === null || input.length < 1) return [];
    input.forEach( value => {
      value > 0 ? p++ : n += value
    })
    return [p , n];
}