I have the following array of objects:

[
  {
    id: "02787783",
    name: "Sedariston Konzentrat Hartkapseln",
    price: 15.69,
    quantity: 2,
    category: "beruhigung-schlaf,ruhe-schlaf,unruhe-verstimmung,x-joh"  
              "anniskraut-kapseln,nerven-beruhigung-schlaf,stress-bur"  
              "n-out"
  },
  {
    id: "16705004",
    name: "Diclox forte Schmerzgel 20 mg/g",
    price: 8.32,
    quantity: 1,
    category: "ratiopharm-gelenke-venen,verstauchungen-prellungen,sch"  
              "merzmittel"
  }
]

And I would like to obtain a single object containing a generic id, the sum of the price*quantity, and a static quantity of 1. So for the example above, the expected is:

{
    "id": "totalAmount",
    "price": 39.7,
    "quantity": 1
}

This is the code I have, which is working correctly, but is quite inefficient if you ask me, as I believe it could be done in one step, probably using the reduce method, but not sure:

function(){
  var itemsIntermediate = [];
  var items = [];
  var checkoutProducts = [
  {
    id: "02787783",
    name: "Sedariston Konzentrat Hartkapseln",
    price: 15.69,
    quantity: 2,
    category: "beruhigung-schlaf,ruhe-schlaf,unruhe-verstimmung,x-joh"  
              "anniskraut-kapseln,nerven-beruhigung-schlaf,stress-bur"  
              "n-out"
  },
  {
    id: "16705004",
    name: "Diclox forte Schmerzgel 20 mg/g",
    price: 8.32,
    quantity: 1,
    category: "ratiopharm-gelenke-venen,verstauchungen-prellungen,sch"  
              "merzmittel"
  }
];

  itemsIntermediate = checkoutProducts.slice().map(function(product){
      return {
        id: "totalAmount",
          price: parseFloat(product.price)*product.quantity
      };
    });

  var holder = {};

  itemsIntermediate.forEach(function(d) {
    if (holder.hasOwnProperty(d.id)) {
      holder[d.id] = holder[d.id]   d.price;
    } else {
      holder[d.id] = d.price;
    }
  });

  for (var prop in holder) {
    items.push({ id: prop, price: holder[prop], quantity: 1 });
  }

  return items;
}

Any ideas on how to make it more efficient?

CodePudding user response：

You could get the total first and then build an object.

const
    data = [{ id: "02787783", name: "Sedariston Konzentrat Hartkapseln", price: 15.69, quantity: 2, category: "beruhigung-schlaf,ruhe-schlaf,unruhe-verstimmung,x-johanniskraut-kapseln,nerven-beruhigung-schlaf,stress-burn-out" }, { id: "16705004", name: "Diclox forte Schmerzgel 20 mg/g", price: 8.32, quantity: 1, category: "ratiopharm-gelenke-venen,verstauchungen-prellungen,schmerzmittel" }],
    price = data.reduce(
        (total, { price, quantity }) => total   price * quantity,
        0
    ),
    result = { id: "totalAmount", price, quantity: 1 };

console.log(result);

CodePudding user response：

You can use Array#reduce with an object as the accumulator like so:

let arr=[{id:"02787783",name:"Sedariston Konzentrat Hartkapseln",price:15.69,quantity:2,category:"beruhigung-schlaf,ruhe-schlaf,unruhe-verstimmung,x-johanniskraut-kapseln,nerven-beruhigung-schlaf,stress-burn-out"},{id:"16705004",name:"Diclox forte Schmerzgel 20 mg/g",price:8.32,quantity:1,category:"ratiopharm-gelenke-venen,verstauchungen-prellungen,schmerzmittel"}];
let res = arr.reduce((acc, {price, quantity}) => (acc.price  = price * quantity, acc), 
  {id: 'totalAmount', price: 0, quantity: 1});
console.log(res);

CodePudding user response：

I would use reduce, as you said.

let obj = [
  {
    id: "02787783",
    name: "Sedariston Konzentrat Hartkapseln",
    price: 15.69,
    quantity: 2,
    category:
      "beruhigung-schlaf,ruhe-schlaf,unruhe-verstimmung,x-joh"  
      "anniskraut-kapseln,nerven-beruhigung-schlaf,stress-bur"  
      "n-out",
  },
  {
    id: "16705004",
    name: "Diclox forte Schmerzgel 20 mg/g",
    price: 8.32,
    quantity: 1,
    category:
      "ratiopharm-gelenke-venen,verstauchungen-prellungen,sch"   "merzmittel",
  },
];

const result = obj.reduce(
  (acc, cur) => {
    acc.price  = cur.price * cur.quantity;
    return acc;
  },
  {
    id: "totalAmount",
    price: 0,
    quantity: 1,
  }
);

console.log(result);