Bad javascript code - Example for blog post - DRY

bad.js

function book(name, author, content, date) {
  var name = name;
  var author = author;
  var content = content;
  var date = date;

  var self = { 
    containsWord: function(word) { 
      return content.indexOf(word) >= 0;
    },
    removeWord: function(word) { 
      return self.containsWord(word) ? content.replace(word + ' ', '') : content;
    },
    replaceWord: function(oldWord, newWord) { 
      return self.containsWord(word) ? content.replace(oldWord, newWord) : content;
    },
    getName: function() { return name; },
    getAuthor: function() { return author; },
    getContent: function() { return content; },
    getDate: function() { return date; }
  };

  return self;
};