tcK1

function valorge(itemId){  
  
  var url = "http://services.runescape.com/m=itemdb_rs/api/catalogue/detail.json?item="+itemId;
  
  var jsondata = UrlFetchApp.fetch(url);
  var object   = JSON.parse(jsondata.getContentText());
  
  return object.item.current.price;
  
}

tcK1

type Positions = 'top' | 'left' | 'right' | 'bottom';

type CombinationTwoElements<T extends Positions = Positions> = T extends infer U
  ? [U, Exclude<Positions, U>]
  : never;

type CombinationThreeElements<T extends Positions = Positions> =
  T extends infer First
    ? [
        First,