[Solved] Merging objects by property, accumulating another property in node

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var sales = [
{
    order_id: 138,
    price: 25,
},
{
    order_id: 138,
    price: 30,
},
{
    order_id: 139,
    price: 15,
},
{
    order_id: 131,
    price: 25,
}, 
];

var buf = {}

sales.map(obj => {
    if(buf[obj.order_id]) {
        buf[obj.order_id].price += obj.price
    } else {
        buf[obj.order_id] = obj
    }
})

var result = Object.values(buf)
console.log(result)

1

solved Merging objects by property, accumulating another property in node