CODEWITHSUNDEEP
javascripttypescript
Mohamed Maher
Mohamed Maher

Reputation: 303

Making Calculation in two object arrays in javascript

I have problem for makings some calculation for two values in two object arrays and get one array of the result,

if the _id is found in orders less the qty from the same _id in the Stocks if keep the qty as it is ..

Array 1 # orders 

 [
    {
      "_id": "5e64cfb59726d72129e78aee",
      "qty": 10
    },
    {
      "_id": "5e64d0fe9978d443af7db86c",
      "qty": 14
    }
  ]

Array 2 # stocks

{
      "_id": "5e64d0fe9978d443af7db86c",
      "qty": 600
    },
    {
      "_id": "5e64cfb59726d72129e78aee",
      "qty": 60
    },
    {
      "_id": "5e64cfb59726d72129e78ab5",
      "qty": 650
    }

needed output : 

{
      "_id": "5e64cfb59726d72129e78aee",
      "qty": 50
    },
    {
      "_id": "5e64d0fe9978d443af7db86c",
      "qty": 586
    },
    {
      "_id": "5e64cfb59726d72129e78ab5",
      "qty": 650
    }

Upvotes: 0

Views: 134

Answers (2)

Random
Random

Reputation: 3236

You have to iterate on your arrays:

orders.foreach(order => {
  let stock = stocks.find(stock => stock._id === order._id);
  if (stock) {
    stock.qty -= order.qty
  }
});
console.log('new stocks', stocks);

Upvotes: 0

Ashish Modi
Ashish Modi

Reputation: 7770

Something like this should do

const stocks = [{
    "_id": "5e64d0fe9978d443af7db86c",
    "qty": 600
  },
  {
    "_id": "5e64cfb59726d72129e78aee",
    "qty": 60
  },
  {
    "_id": "5e64cfb59726d72129e78ab5",
    "qty": 650
  }
];

const orders = [{
    "_id": "5e64cfb59726d72129e78aee",
    "qty": 10
  },
  {
    "_id": "5e64d0fe9978d443af7db86c",
    "qty": 14
  }
];

const result = stocks.map(stock => {
  const foundRec = orders.find(order => order._id === stock._id);
  if (foundRec) {
    return {
      "_id": stock._id,
      "qty": stock.qty - foundRec.qty
    };
  }
  return stock;
});

console.log(result);

Upvotes: 1

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