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how to sum multiple object with the same key in an array?

M Amir answered on July 19, 2022 Popularity 1/10 Helpfulness 1/10

answer how to sum multiple object with the same key in an array?

related sum similar keys in array of objects

how to sum multiple object with the same key in an array?

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ar array = [
  {name: "Peter", age: 43},
  {name: "John", age: 32},
  {name: "Jake", age: 21}
];

array.reduce(function(sum, current) {
  return sum + current.age;
}, 0); // 43 + 32 + 21 = 96

Popularity 1/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript key object sum

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Contributed on Jul 19 2022

M Amir

0 Answers Avg Quality 2/10

Closely Related Answers

sum similar keys in array of objects

Comment

const arr = [ { 'name': 'P1', 'value': 150 }, { 'name': 'P1', 'value': 150 }, { 'name': 'P2', 'value': 200 }, { 'name': 'P3', 'value': 450 } ];

const sumByKey = (arr, key, value) => {
  const map = new Map();
  for(const obj of arr) {
    const currSum = map.get(obj[key]) || 0;
    map.set(obj[key], currSum + obj[value]);
  }
  const res = Array.from(map, ([k, v]) => ({[key]: k, [value]: v}));
  return res;
}

console.log(sumByKey(arr, 'name', 'value')); // 'name' = value to group by, 'value' = value to sum
 Run code snippet

Popularity 8/10 Helpfulness 4/10 Language javascript

Source: stackoverflow.com

Tags: sum javascript

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