trash-to-treasure.js

function smartGarbage(trash, bins) {
  switch (trash) {
  case 'waste':
    bins.waste = bins.waste + 1;
    break;
  case 'recycling':
    bins.recycling = bins.recycling + 1;
    break;
  case 'compost':
    bins.compost = bins.compost + 1;
    break;
  }
  return bins
}

console.log(smartGarbage('recycling', { waste: 4, recycling: 2, compost: 5 }));