I want the result to be summing all the qty of same cat.
var data = [
{ cat: 'EK-1',name:"test",info:"mat", quantity: 3},
{ cat: 'EK-2', name:"test2",info:"nat"quantity: 1}
];
I tried like this below i have array of object having some similar objects. how to add qty and create unque objects .below i have given 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,
quantity
}));
console.log(products);You can do this using Array#reduce, using the accumulator to pass on the new object:
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, }, ];
let seen = [];
const res = data.reduce((acc, { cat, ...rest }) => {
const idx = seen.indexOf(cat);
if (idx == -1) (acc.push({cat, ...rest}), seen.push(cat));
else acc[idx].quantity++;
return acc;
}, []);
console.log(res);