How to merge 2 objects and update the common object keys

JavaScript
1

Hi guys,

So I have 2 objects and some object keys are common in both of them. I want to merge the 2 objects so that the values of the common keys add up upon merging.

For example, I have 2 objects as below

let obj1 = {
  "key1":5,
  "key2":8,
  "key3":6
}

let obj2 = {
  "key1":3,
  "key2":7,
  "key4":9
}

Once the 2 objects are merged, the output should look like this:

let output = {
  "key1":8, 
  "key2":15,
  "key3":6,
  "key4":9
}

How do I do this in vanilla JavaScript?
Thanks

3

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