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

This question already have a lot of goods answers but I make a version who also handle multi-levels objects:

let sumAllKeys = (obj1, obj2) => Object.keys({...obj1, ...obj2}).reduce((acc, key) => {
  let key1 = obj1 && obj1[key] || 0;
  let key2 = obj2 && obj2[key] || 0;
  acc[key] = (typeof key1 == "object" || typeof key2 == "object")
    ? sumAllKeys(key1, key2)
    : (parseFloat(key1) || 0) + (parseFloat(key2) || 0);
  return acc;
}, {});


// Example: 

let a = {qwerty:1, azerty: {foo:2, bar:3}}
let b = {qwerty:5, azerty: {foo:4}, test:{yes:12, no:13}};
let c = {azerty: {bar:2}, test:{no:1}, another:{child:{subchild:3}}};

console.log("Sum of: ", {a,b,c});
console.log("Equal: ", [a, b, c].reduce(sumAllKeys, {}));