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//nice
function getDrink (type) {
  var drink;
  var drinks = {
    'coke': 'Coke',
    'pepsi': 'Pepsi',
    'lemonade': 'Lemonade',
    'default': 'Default item'
  };
  return 'The drink I chose was ' + (drinks[type] || drinks['default']);
}

var drink = getDrink('coke');

//great
function getDrink (type) {
  return 'The drink I chose was ' + {
    'coke': 'Coke',
    'pepsi': 'Pepsi',
    'lemonade': 'Lemonade'
  }[type];
}

//similar approach
var colorObj = {
  'black': printBlackBackground,
  'red': printRedBackground,
  'blue': printBlueBackground,
  'green': printGreenBackground,
  'yellow': printYellowBackground
};

if (color && colorObj.hasOwnProperty(color)) {
  colorObj[color]();
}