How to sum two object values in javascript

Question

I\'m stuck how i sum two object like this:

obj1 = { 
  \'over_due_data\': 10,
  \'text_data\': 5
} 

obj2 = {
  \'over_due_data\': 20,
  \'text_data\': 5
}
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Answer 1

I have used below snippet to sum the two objects even if any of them has additional properties.

This solution is based on Array.prototype.reduce and short-circuit evaluation

Object.keys({ ...obj1, ...obj2 }).reduce((accumulator, currentValue) => {
    accumulator[currentValue] =
        (obj1[currentValue] || 0) + (obj2[currentValue] || 0);
    return accumulator;
}, {});

var obj1 = {
  'over_due_data': 10,
  'text_data': 5,
  'some_add_prop': 80
};

var obj2 = {
  'over_due_data': 20,
  'text_data': 5,
  'add_prop': 100
};


const sumOfObjs = Object.keys({ ...obj1,
  ...obj2
}).reduce((accumulator, currentValue) => {
  accumulator[currentValue] =
    (obj1[currentValue] || 0) + (obj2[currentValue] || 0);
  return accumulator;
}, {});

console.log(sumOfObjs);