How to set a nested key in an object from a string? [duplicate]

Question

I have an object that looks like this:

let myObj = {
  one: 1,
  two: 2,
  three: {
   something: '1'
  }
}

Now, I have a string such as this:

"three.myNestedNewKey"

And I want to add the key myNestedNewKey to the three key, and add a value, let's say the number 2. so that it ends up like this:

let myObj = {
  one: 1,
  two: 2,
  three: {
   something: '1',
   myNestedNewKey: '2'
  }
}

I tried doing this:

myObj["three.myNestedNewKey"] = 2

But it just adds one key like this:

let myObj = {
  one: 1,
  two: 2,
  three: {
   something: '1',
  },
  three.myNestedNewKey: 2,
}

So it adds just one new key with the dot in it.

I do want to keep the existing values of what is inside the three key, but add myNestedNewKey to it.

Any ideas how to do this in a simple way?

There are quite a few dups with quite a few answers, but one of the better ones is here stackoverflow.com/a/48589524/294949 — danh
– danh, Commented Aug 2, 2022 at 15:51

imvain2 · Accepted Answer · 2022-08-02 15:51:32Z

0

You can reference three after myObj then use the brackets

let myObj = {
  one: 1,
  two: 2,
  three: {
   something: '1'
  }
}

myObj.three["myNestedNewKey"] = 2
console.log(myObj)

answered Aug 2, 2022 at 15:51

imvain2

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