Node app to read apple financial data and combine them into a single tab separated file

parse_apple_data.js

// Assumes all apple data is tab seperated and in the current directory
var fs = require('fs');
var path = require('path');
var cwd = process.cwd();
var contents = fs.readdirSync(cwd);

var _headers = [];
var _data = [];

function parseHeaders (cols) {
  for (var i=0, ii=cols.length; i<ii; i++) {
    var indx = _headers.indexOf(cols[i]);
    if (indx === -1) {
      indx = _headers.length;
    }
    _headers[indx] = cols[i];
  }
  return cols;
}

function parseRow (headers, cols) {
  var row = [];
  for (var i=0, ii=cols.length; i<ii; i++) {
    var header = headers[i];
    var indx = _headers.indexOf(header);
    row[indx] = cols[i];
  }
  return row;
}

function splitByTab (str) { return str.split(/\t/g); }

contents.forEach(function (file) {
  if (file.substr(file.length - 4) !== '.txt') {
    return;
  }
  var contents = fs.readFileSync(path.join(cwd, file), { encoding: 'utf8' });
  var lines = contents.split(/\n/g);
  var headers = splitByTab(lines[0]);
  parseHeaders(headers);
  for (var i=1, ii=lines.length; i<ii; i++) {
    var line = lines[i];
    if (line.indexOf('Total_Rows') !== -1) {
      return;
    }
    var row = parseRow(headers, splitByTab(line));
    _data.push(row);
  }
});

console.log(_headers.join('\t'));
_data.map(function (row) {
  console.log(row.join('\t'));
});