Price of simple parts

price_simple_parts.ts

// Task 3. Price of simple parts

// We are selling computer hardware. We have products assembled from parts. 
// For example PC is build from motherboard, cpu, hard drive, etc. Some parts are simple: they have no sub parts like CPU. 
// When the part has subparts it is not simple. For example PC body has different subparts like covers, screws, etc.
// Every part has price. 

// Task:

// For a given list of parts find total price of the all simple parts.
// Design the data structure and write function returning the price for the given list.

interface Part {
  id: number;
  name: string;
  parentId: number | null;
  price: number;
}

const PC_PARTS: Part[] = [
  {
    id: 1,
    name: "CPU",
    parentId: null,
    price: 100,
  },
  {
    id: 2,
    name: "HDD",
    parentId: null,
    price: 50,
  },
  {
    id: 3,
    name: "Optical drive",
    parentId: null,
    price: 10,
  },

  {
    id: 4,
    name: "Motherboard",
    parentId: null,
    price: 140,
  },

  {
    id: 5,
    name: "capacitor",
    parentId: 4,
    price: 5,
  },

  {
    id: 6,
    name: "transistor",
    parentId: 4,
    price: 6,
  },

  {
    id: 7,
    name: "PCB",
    parentId: 4,
    price: 15,
  },

  {
    id: 8,
    name: "Power Supply",
    parentId: null,
    price: 45,
  },

  {
    id: 9,
    name: "Power Body",
    parentId: 8,
    price: 15,
  },

  {
    id: 10,
    name: "Power connector",
    parentId: 8,
    price: 26,
  },
];

const findTotalPriceOfSimpleParts = (data: Part[]) => {
  return data.reduce((acc, curr) => {
    if (curr.parentId !== null) {
      acc += curr.price;
    }
    return acc;
  }, 0);
};

console.log(
  "findTotalPriceOfSimpleParts",
  findTotalPriceOfSimpleParts(PC_PARTS)
);