Add price of duplicate object to first unique object in array using JavaScript only [duplicate]

Question

Input array

[{ id: 1, title: 'shirt', price: 2000 }, 
{ id: 2, title: 'shirt', price: 4000}, 
{ id: 3,  title: 'tshirt', price: 10000}]

Expected output

[{ id: 1, title: 'shirt', price: 6000 },          // 2000 + 4000
{ id: 3,  title: 'tshirt', price: 10000}]

Have tried multiple ways to achieve but couldn't get a solution.

I'm able to get unique objects but need the addition of price as well

let result = products.filter((product, index, self) =>
  index === self.findIndex((t) => (t.title === product.title))
)
console.log(result);

@NinaScholz yeah duplicate price should add to the first matched. — akhtarvahid
– akhtarvahid, Commented Nov 7, 2020 at 17:37

Nina Scholz · Accepted Answer · 2020-11-07 17:39:28Z

1

You could take an object as hash bale for same title and get the values from the object.

const
    data = [{ id: 1, title: 'shirt', price: 2000 }, { id: 2, title: 'shirt', price: 4000}, { id: 3,  title: 'tshirt', price: 10000}],
    result = Object.values(data.reduce((r, o) => {
        if (r[o.title]) r[o.title].price += o.price;
        else r[o.title] = { ...o };
        return r;
    }, {}));

console.log(result);

.as-console-wrapper { max-height: 100% !important; top: 0; }

answered Nov 7, 2020 at 17:39

Nina Scholz

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1 Comment

akhtarvahid Over a year ago

Thanks, Really it solved my problem.

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