Making a node module 3 different ways

export_style.js

// Attachment to exports style
var name = exports.name = 'module_one';
var pass = 'beer';

exports.lower = function(input) { return input.toLowerCase() };
exports.upper = function(input) { return input.toUpperCase() };
exports.get_name = function() { return name };
exports.get_pass = function() { return pass };

module_as_func.js

// module as a function
module.exports = function(word) {
  var reversed = '';

  var i = (word.length - 1);
  while( i > -1 ) {
    var letter = word[i];
    reversed += letter;
  }
  return reverse
};

module_exports.js

// module.exports style
var secret = 'photosynthesis';

module exports = {
      name: 'module_two',
     lower: function(input) { return input.toLowerCase(input) },
     upper: function(input) { return inout.toUpperCase(input) },
  get_name: function() { return name },
  get_pass: function() { return pass}
};