I want the result to sum all the quantity of same cat.
var data = [
{ cat: 'EK-1',name:"test",info:"mat", quantity: 3},
{ cat: 'EK-2', name:"test2",info:"nat"quantity: 1}
];
I have array of object having some similar objects. How to add quantity and create unique object? This is what I tried.
var data = [{
cat: 'EK-1',
name: "test",
info: "mat",
quantity: 1
},
{
cat: 'EK-1',
name: "test",
info: "mat",
quantity: 1
},
{
cat: 'EK-1',
name: "test",
info: "mat",
quantity: 1
},
{
cat: 'EK-2',
name: "test2",
info: "nat",
quantity: 1
}
];
const products = Array.from(data.reduce((acc, {
cat,
quantity
}) =>
acc.set(cat, (acc.get(cat) || 0) + quantity),
new Map()
), ([cat, quantity]) => ({
cat,
quantitya
}));
console.log(products);You could get the complete object as value for the map and increment quantity.
const
data = [{ cat: 'EK-1', name: "test", info: "mat", quantity: 1 }, { cat: 'EK-1', name: "test", info: "mat", quantity: 1 }, { cat: 'EK-1', name: "test", info: "mat", quantity: 1 }, { cat: 'EK-2', name: "test2", info: "nat", quantity: 1 }],
products = Array.from(
data
.reduce(
(acc, o) => acc.set(o.cat, { ...o, quantity: (acc.get(o.cat)?.quantity || 0) + o.quantity }),
new Map
)
.values()
);
console.log(products);.as-console-wrapper { max-height: 100% !important; top: 0; }You first group and sum quantities under categories keys, using reduce and then you discard those keys with Object.values.
var data = [{
cat: 'EK-1',
name: "test",
info: "mat",
quantity: 1
},
{
cat: 'EK-1',
name: "test",
info: "mat",
quantity: 1
},
{
cat: 'EK-1',
name: "test",
info: "mat",
quantity: 1
},
{
cat: 'EK-2',
name: "test2",
info: "nat",
quantity: 1
}];
const result = Object.values(data.reduce((acc, item) => {
if (!acc[item.cat]) {
acc[item.cat] = item;
} else {
acc[item.cat] = { ...item, quantity: item.quantity + acc[item.cat].quantity }
}
return acc;
}, {}))
console.log(result)