docparse-supplier-nge/lib/sumOtherCosts.js

process ngrid electric utility bill data for use in the docparse system

/**
 * Note that credits are stored as negative costs
 * @param {Array} costs contains entries that look like
 * costs = [
 *   {
 *     description: "Sales Tax",
 *     value: 1082.41,
 *   },
 *   {
 *     description: "Late Payment Charges ",
 *     value: 31.59,
 *   },
 *   {
 *     description: "General Credits ",
 *     value: -2.99,
 *   },
 * ]
 * @return {Integer} the summed value, which for the example above should be
 *   1111.01 = 1082.41 + 31.59 + (-2.99)
 */

var num = require('num');
module.exports = function(costs) {
  var sum = num(0);
  for (var i in costs) {
    var cost = costs[i];
    sum = sum.add(num(cost.value));
  }
  return sum;
}