Minimum and Maximum values that can be calculated by summing exactly `n-1` of the `n` integers

minMaxSum.js

function maxMinSum(intArray) {
  var sum = sumOfArray(intArray);
  var sums = intArray.map(num => sum - num);
  return [minOfArray(sums), maxOfArray(sums)].join(' ');
}

function sumOfArray(intArray) {
  return intArray.reduce((total, curr) => total += curr, 0);
}

function maxOfArray(intArray) {
	return Math.max.apply(null, intArray);
}

function minOfArray(intArray) {
	return Math.min.apply(null, intArray);
}

console.log(maxMinSum([1,2,3,4,5]))