[
  // Compare Price per Mass
  {
    "name": "Compare price per mass",
    "description": "Compares two products by their price per mass and returns which is cheaper, including price per kg for each product.",
    "input": [
      {"name": "price1", "unit": "currency"},
      {"name": "mass1", "unit": "kilogram"},
      {"name": "price2", "unit": "currency"},
      {"name": "mass2", "unit": "kilogram"}
    ],
    "output": {"name": "Result", "unit": "string"},
    "d4rtCode": """
       var p1 = price1 / mass1;
       var p2 = price2 / mass2;
       if (p1 < p2) {
         Result = 'first product is cheaper at \${p1.toStringAsFixed(2)} currency/kg vs \${p2.toStringAsFixed(2)} currency/kg';
       } else if (p2 < p1) {
         Result = 'second product is cheaper at \${p2.toStringAsFixed(2)} currency/kg vs \${p1.toStringAsFixed(2)} currency/kg';
       } else {
         Result = 'both products have the same price per mass at \${p1.toStringAsFixed(2)} currency/kg';
       }
    """,
    "tags": ["comparison", "shopping", "economics"]
  }
]