function howMuchShouldIDrink(n, isSLC, talksTomorrow) {
  var drinks = n + 1

  if(isSLC) {
    var slcDrinks = drinks * 3
    return slcDrinks - talksTomorrow
  }

  return drinks - talksTomorrow
}

howMuchShouldIDrink(3, true, 1)

query {
  allAttendees {
    name
    favoriteMusician {
      name
    }
    favoriteTree {
      name
    }
    vendor
  }
}

{
  "data":{
    "allAttendees": [
      {
        "name": "Jean Johnson",
        "favoriteMusician": {
            "name": "Plantadestiny"
        },
        "favoriteTree": {
            "name": "SugarPine"
        },
        "vendor": false
      }
    ]
  }
}

<Subscription subscription={GAME_CHANGE_SUBSCRIPTION}>
  {({ loading, data }) => loading ?
    <p>Waiting for Instruments...</p> :
    <div>
      <ul>
        {data.gameChange.playingMusic.map((p, i) => 
            <li key={i}>{p.instrument}</li>
        )}
      </ul>
    </div>
  }
</Subscription>