CODEWITHSUNDEEP
javascriptarraysobjectvue.js
stephen Kuforiji
stephen Kuforiji

Reputation: 43

How to update property of an particular object in array

I am trying to create a stock trader application and i have an empty array for the stocks bought. Each Stock bought adds an object to the array. if that same stock is bought again, I want to check for the stock and then append ONLY THE QUANTITY TO THAT RELEVANT ARRAY . else i want to append just the new object .

I have tried using the for Each loop and some function , but I cant seem to get the current element that has been bought already and update only its quantity. I am able to get the quantity to be added but not that specific object for it to be appended to .

item is the object to be appended to the array. only quantity if object is already in array; Thanks!

stocks = [
        {id:0, name:'BMW', price:5 , quantity:0},
        {id:1, name:'Google',price:20, quantity:0},
        {id:2, name:'IBM', price:34, quantity:0},
        {id:3, name:'Apple', price:15,quantity:0}
    ];
...
...
 stockPortfolio =[]
...
   //the item is the 
        'ADD_PORTFOLIO_ITEM'(stockPortfolio , item){
      //checking if an itemid  exists            
     // if not create  a new one            
            const arrayP = stockPortfolio            
            const found = arrayP.some(el => el.name === item.name);
            if (found) {

            }
            else{

Upvotes: 1

Views: 125

Answers (2)

Varun Agarwal
Varun Agarwal

Reputation: 1587

This works for me. Let me know if you face any issues. I am changing the original array of stockPortfolio. If you wish to return a new array use .slice() at the start of the function 'addStock'

const stocks = [
        {id:0, name:'BMW', price:5 , quantity:0},
        {id:1, name:'Google',price:20, quantity:0},
        {id:2, name:'IBM', price:34, quantity:0},
        {id:3, name:'Apple', price:15,quantity:0}
    ];

let stockPortfolio = [ ];

function addStock(stockPortfolio , item) {
  let found = stockPortfolio .some(el => el.name === item.name)
  if (!found) {
     stockPortfolio.push(item);

  } else {
      for (var i = 0; i < stockPortfolio.length; i++) {
        if (stockPortfolio[i].name === item.name) {
          stockPortfolio[i].quantity += item.quantity;
        }
      };
  };
};

Upvotes: 1

Lior Hai
Lior Hai

Reputation: 487

const found = stockPortfolio.find(el => el.name === item.name);
if (found) {
    // found contains the matched item
} else {
    // no match found, add to array
}

Upvotes: 2

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