javascript在另一个数组中找到嵌套对象并进行数学计算

Question

我需要在“附件”数组中从'products.accessories‘数组中找到两个嵌套对象，并检查它们的货币与奇偶乘，检查它们的单位乘以’Products.properties. result‘，用它们的'qty’乘以每个对象，并将它们的结果相加。

任何建议都是非常感谢的。谢谢。

var accessories = [{
  name: 'Accessory-1',
  currency: 'eur',
  price: 1,
  unit: 'm'
},
{
  name: 'Accessory-2',
  currency: 'usd',
  price: 2,
  unit: 'pcs'
}];

var products = [{
  name: 'Product',
  properties: [{
    no: 'Product-1',
    length: '2000',
    accessories: [{
      name: 'Accessory-1',
      qty: 1
    },
    {
      name: 'Accessory-2',
      qty: 1
    }]
  }]
}];

// currencies
let eurusd = 1.18
let gbpusd = 1.38

编辑:谢谢，AlexeyZelenin

    function getPrice(accessory) {
        accessory.unit === 'm' ? unitMultiplier = length / 1000 : unitMultiplier = 1
        return (
            accessory.currency === 'eur' ? (accessory.price * eurusd) : 
                (accessory.currency === 'gbp' ? (accessory.price * gbpusd) : 
                        accessory.price)
                        ).toFixed(2)
    }

    function getAcc(property) { 
        return property.accessories 
            .map(x => x.qty * getPrice(accessories.find(p => p.name === x.name)) * unitMultiplier)
            .reduce((c, p) => c + p)
    }

PUG:

each i in products
     .....
     each j in i.properties
          .....
          length = j.length
          .....

Answer 1

​

// Accessories: each accessory might be presented several times with different currencies
var accessories = [
  {
      name: 'Accessory-1',
      currency: 'eur',
      price: 3,
      unit: 'm',
  },
  {
      name: 'Accessory-2',
      currency: 'eur',
      price: 5,
      unit: 'm',
  },
  {
      name: 'Accessory-3',
      currency: 'usd',
      price: 2,
      unit: 'pcs',
  },  
]

// Products - each product has properties with "accessories" inside
var products = [
  {
      name: 'Product',
      properties:
      [
          {
              no: 'Product-1',
              length: '2000',
              accessories: [
                      {
                      name: 'Accessory-1', 
                      qty: 2
                      },
                      {
                      name: 'Accessory-2', 
                      qty: 2
                      },
                      {
                        name: 'Accessory-3', 
                        qty: 1
                        },
                    ]
          },
      ]
  }
];

//currencies
let eurusd = 1.18;
let gbpusd = 1.38;
//functions
function getPrice(product) {
  return (
      product.currency === 'eur' ? (product.price * eurusd) : 
          (product.currency === 'gbp' ? (product.price * gbpusd)     : 
              product.price)).toFixed(2);
}

// The function gets one product as an incoming parameter
// Then gets the list of all accessories for all properties
// Finds the accessory from the global array, calculates right price
// based on accessory currency and multiplies it by accessory quantity
// Then summarises all prices
function getAccessories(product) {
  return product.properties
    .map(x => ({
      accessories: x.accessories.map(b => ({
        ...b, 
        length: +x.length
      }))
    }))
    .flatMap(x => x.accessories) // get all accessories
    .map(x => x.length * x.qty * getPrice(accessories.find(p => p.name === x.name))) // find the price of accessory from global array
    .reduce((c, p) => c + p) // sum prices
    ;
}
console.log(getAccessories(products[0]));

​