gistfile1.js

// Module to contain logic for fixing characters.
var FigureFixer = {
  Map: { }, // Holds character/code pairs

  // Adds a character/code pairing, where the "code"
  // is the escaped string and the "character" is the
  // character that should replace it.
  add: function(code, character) {
    FigureFixer.Map[code] = character;
  },

  // Iterate through the code/characters added and replace
  // each, then return the string.
  parse: function(string) {
    for (code in FigureFixer.Map)
      string.replace(code, FigureFixer[code]);
    return string;
  }
}

// Add a simple method to strings for fixing characters
String.prototype.fixCharacters = function() {
  return FigureFixer.parse(this);
}

// Add character/code pair
FigureFixer.add("\u0026", '&');

// Create a test string
var TEST_STRING = "This \u0026 That";

// Call string method
TEST_STRING.fixCharacters();

// View result
print(TEST_STRING); // => This & That