sum.js

function range(start, end)
{
  var arrayRange = [];
  for (var i = start; i <= end; i++)
  {
    arrayRange.push(i);
  }
  return arrayRange;
}

function sum(arraySum)
{
  var sumOfArray = 0, arrayLength = arraySum.length;
  for (var i = 0; i < arrayLength; i++)
  {
    sumOfArray += arraySum.pop();
  }
  return sumOfArray;
}