Where am I spending my money?

credit-cart.js

var fs = require('fs');
var sc = require('sc-card-transaction-parser');
var _ = require('lodash');
var file = fs.readFileSync('transactions.txt');
var transactions = sc.parseLog(file);

var expenses = function(data, type) {
  var grouped = _.groupBy(data, type);
  return _.keys(grouped).map(function(a) {
    return {
      type: a,
      amount: _.round(_.sum(grouped[a], 'amount'), 2)
    };
  });
}

console.log(_.sortBy(expenses(transactions,'desc'), function(a) {
  return a.amount;
}));