I am looking to create a new array that combines values of repeated campaigns
let arrayName = [
{ campaign: "a", value: 3 },
{ campaign: "b", value: 5 },
{ campaign: "c", value: 7 },
{ campaign: "a", value: 9 },
];
EXPECTED OUTPUT:
[
{ campaign: 'a', value: 12 },
{ campaign: 'b', value: 5 },
{ campaign: 'c', value: 7 }
]
To simplify an object, you can reduce the items it contains and then convert them back into objects.
const arrayName = [
{ category: "x", amount: 3 },
{ category: "y", amount: 5 },
{ category: "z", amount: 7 },
{ category: "x", amount: 9 },
];
const result = Object
.entries(arrayName.reduce((acc, { category, amount }) =>
({ ...acc, [category]: (acc[category] || 0) + amount }), {}))
.map(([category, amount]) => ({ category, amount }));
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