How to combine array from an array with similar id?

Question

Suppose I have a array like this.

const info = [
    {
        productId: "1",
        name: "This is product name 1",
        sellerId: "12",
        price: 30,
    },
    {
        productId: "2",
        name: "This is product name 2",
        sellerId: "12",
        price: 50
    },
    {
        productId: "3",
        name: "This is product name 3",
        sellerId: "13",
        price: 50
    }
]

**This is dynamic array. Array value can be changed.

Now I have to combine this array or filter this array. I have not any idea about how can I write function. But my result will be like this-

const result = [
    {
        sellerId: "12",
        productIds: [ //Combine products by similar sellerId
            {
                name: "This is product name 1",
                productId: "1"
            },
            {
                name: "This is product name 2",
                productId: "2"
            }
        ],
        total: 80 //Total price of this two product
    },
    {
        sellerId: "13",
        productIds: [
            {
                name: "This is product name 3",
                productId: "3"
            }
        ],
        total: 50
    }
]

Please do not close my question. I almost check all similar questions. But I have a different issue here. Just please help me.

so, it seems that you are wanting to combine two arrays, but you seem to only give one and then the result seems to be the expected outcome. Or are you just asking how to make the array info to look like array result? — Mr.Lister
– Mr.Lister, Commented Oct 21, 2022 at 16:53

dave · Accepted Answer · 2022-10-21 16:53:00Z

You could use .reduce and check if you already have that sellerId, if so, push the item and update total, else create the item:

const info = [
    {
        productId: "1",
        name: "This is product name 1",
        sellerId: "12",
        price: 30,
    },
    {
        productId: "2",
        name: "This is product name 2",
        sellerId: "12",
        price: 50
    },
    {
        productId: "3",
        name: "This is product name 3",
        sellerId: "13",
        price: 50
    }
]

const result = info.reduce((carry, el) => {
    const { sellerId, price, ...rest } = el;
    const i = carry.find((c) => c.sellerId === sellerId);

    if (!i) {
         carry.push({ sellerId, productIds: [rest], total: price })
    } else {
        i.productIds.push(rest);
        i.total += price;
    }
    return carry;
}, []);

console.log(result);

PeterKA · Accepted Answer · 2022-10-21 17:49:09Z

You can use Object.values() and Array#reduce() methods as follows:

const 
    input = [ { productId: "1", name: "This is product name 1", sellerId: "12", price: 30, }, { productId: "2", name: "This is product name 2", sellerId: "12", price: 50 }, { productId: "3", name: "This is product name 3", sellerId: "13", price: 50 } ],
    
    output = Object.values(
      input.reduce(
        (acc,{productId,name,sellerId,price}) =>
        ({
            ...acc,
            [sellerId]:{...(acc[sellerId] || {}), 
                sellerId, 
                productIds: [...(acc[sellerId] && acc[sellerId]['productIds'] || []), 
                {name,productId}]
            }
        }),
      {})
    );
    
    console.log( output );

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