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function doAction(action) {
  var actions = {
    'hack': function () {
      return 'hack';
    },

    'slash': function () {
      return 'slash';
    },

    'run': function () {
      return 'run';
    }
  };

  if (typeof actions[action] !== 'function') {
    throw new Error('Invalid action.');
  }


  return actions[action]();
}