How to Sum the Values of a JavaScript Object

How to sum the values of a JavaScript object?

You could put it all in one function:

function sum( obj ) {  var sum = 0;  for( var el in obj ) {    if( obj.hasOwnProperty( el ) ) {      sum += parseFloat( obj[el] );    }  }  return sum;}    var sample = { a: 1 , b: 2 , c:3 };var summed = sum( sample );console.log( "sum: "+summed );

How to sum the array of object values and assigned them to the relevant key name

solved using reduce and forEach

Inside the reduce function I'm running a forEach on the array of keys of the incomes object/attribute. For each key which is a date I'm checking if the accumulator of the reduce function contains an attribute for each date and creates if not. After creating the attribute I'm summing the value for the current date attribute.

const data = [{
    group: 'A',
    incomes: {
      "2019-12": 100,
      "2020-12": 200,
      "2021-12": 15
    }
  },
  {
    group: 'B',
    incomes: {
      "2019-12": 25,
      "2020-12": 50,
    }
  }
]

const totalIncomes = data.reduce((acc, curr) => {
  Object.keys(curr.incomes).forEach((key, index) => {
    if (!acc[key]) {
      acc[key] = 0
    }
    acc[key] += curr.incomes[key]
  })
  return acc
}, {})

console.log(totalIncomes)

Sum values of a JavaScript object

If numOfElemements meant elements in data object, then current implementation will do. Else uncomment the existing commented lines, and comment the line after the last commented line. Which considers elements in the data object.

const obj = {
  1: {
    data: {
      a: 100,
      z: 100,
      e: 50,
    },
  },
  2: {
    data: {
      a: 10,
      z: 10,
      e: 20,
    },
  },
};
function groupBySum(obj) {
  let data = {};
  let percentage = {};
  // let numberOfElements = 0;
  for (let i in obj) {
    // numberOfElements += 1;
    for (let j in obj[i].data) {
      if (data[j] === undefined) {
        data[j] = obj[i].data[j];
      } else {
        data[j] += obj[i].data[j];
      }
    }
  }
  for (let i in data) {
    // percentage[i] = data[i] / numberOfElements;
    percentage[i] = data[i] / Object.keys(data).length;
  }
  return {
    data,
    percentage,
  };
}
console.log(groupBySum(obj));

sum all values of an object in an array of objects javascript

Use Array.reduce to calculate the sum

const sum = array.reduce((acc, o) => acc + parseInt(o.value), 0)

How to sum object values by a key value that is an date object?

Kind of ES6 way and grouping by hash solution:

const arr = [{"Datum":{"date":"2000-01-01 00:00:00.000000","timezone_type":3,"timezone":"Europe/Berlin"},"Material":"123","Menge":100,"Fehler":5},{"Datum":{"date":"2000-01-01 00:00:00.000000","timezone_type":3,"timezone":"Europe/Berlin"},"Material":"123","Menge":5,"Fehler":1},{"Datum":{"date":"2000-01-01 00:00:00.000000","timezone_type":3,"timezone":"Europe/Berlin"},"Material":"123","Menge":6,"Fehler":65},{"Datum":{"date":"2000-01-01 00:00:00.000000","timezone_type":3,"timezone":"Europe/Berlin"},"Material":"222","Menge":10,"Fehler":5},{"Datum":{"date":"2000-01-02 00:00:00.000000","timezone_type":3,"timezone":"Europe/Berlin"},"Material":"444","Menge":29,"Fehler":1},{"Datum":{"date":"2000-01-02 00:00:00.000000","timezone_type":3,"timezone":"Europe/Berlin"},"Material":"123","Menge":1,"Fehler":1}]

const result = Object.values(arr.reduce((acc, obj) => {
  const [Datum] = obj.Datum.date.split(' ');
  const Menge = (acc[Datum]?.Menge + obj.Menge) || obj.Menge;
  const Fehler = (acc[Datum]?.Fehler + obj.Fehler) || obj.Fehler;
  const Ratio = Fehler / Menge;
  acc[Datum] = { Datum, Menge, Fehler, Ratio };
  return acc;
}, {}));

console.log(result);

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