Count labels of one kind

gistfile1.txt

function countLabelsOfOneKind()
{
  var output = [];
  
  new Trellinator().board("My Board").lists().each(function(list)
  {
    output.push(list.name()+":\n");
    var current = {};
    list.cards().each(function(card)
    {
      card.labels().each(function(label)
      {
        if(!current[label.name()])
        {
          current[label.name()] = 0;
        }
        
        current[label.name()]++;
      });
      
      output.push(
        new IterableCollection(current).find(function(number,name)
        {
          return name+": "+number;
        }).asArray().join("\n");
      );
    });
  });
  
  Logger.log(output.join("\n"));
}