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/** * The base implementation of `_.sum` and `_.sumBy` without support for * iteratee shorthands. * * @private * @param {Array} array The array to iterate over. * @param {Function} iteratee The function invoked per iteration. * @returns {number} Returns the sum. */function baseSum(array, iteratee) {  var result,      index = -1,      length = array.length;
  while (++index < length) {    var current = iteratee(array[index]);    if (current !== undefined) {      result = result === undefined ? current : (result + current);    }  }  return result;}
module.exports = baseSum;