I have this array
const data = [
{"id": "One", "number": 100},
{"id": "One", "number": 150},
{"id": "One", "number": 200},
{"id": "Two", "number": 50},
{"id": "Two", "number": 100},
{"id": "Three", "number": 10},
{"id": "Three", "number": 90}
];
and I want to get the sum for each id and create a new array like this:
[
{"id": "One", "number": 450},
{"id": "Two", "number": 150},
{"id": "Three", "number": 100},
]
You can implement it by using reduce() as follows:
const data = [
{"id": "One", "number": 100},
{"id": "One", "number": 150},
{"id": "One", "number": 200},
{"id": "Two", "number": 50},
{"id": "Two", "number": 100},
{"id": "Three", "number": 10},
{"id": "Three", "number": 90}
];
const result = data.reduce((acc, {id, number}) => ({...acc, [id]: {id, number: acc[id] ? acc[id].number + number: number}}), {});
console.log(Object.values(result));Don't know why you do not have a try,just using a simple reduce() can do it
const data = [{"id": "One", "number": 100},
{"id": "One", "number": 150},
{"id": "One", "number": 200},
{"id": "Two", "number": 50},
{"id": "Two", "number": 100},
{"id": "Three", "number": 10},
{"id": "Three", "number": 90}]
let result = data.reduce((a, v) => {
let obj = a.find(i => i.id == v.id);
if (obj) {
obj.number += v.number;
} else {
a.push(v);
}
return a;
}, [])
console.log(result);
""instead of“”