js how to use .reduce() to get an object with arrays out of a nested object with arrays

Question

I am looking for a solution on how to reduce the following object:

const myObject = {
  first: 'A',
  second: {
    nestedArr1: ['nestA', 'nestB'],
    nestedArr2: ['nestC', 'nestD'],
  }
}

to the expected result:

const myObject = {
      first: 'A',
      nestedArr1: ['nestA', 'nestB'],
      nestedArr2: ['nestC', 'nestD'],
    }

Thanks in advance!

disclaimer: I was looking for an answer and there are some, but just not using .reduce() (or at least I couldn't find anything.

Since you defined it with const, do you want to mutate the object? — trincot
– trincot, Commented Jan 13, 2023 at 10:49
Well, then const (as you have it in your question) is not going to work... — trincot
– trincot, Commented Jan 13, 2023 at 10:52
if I would do it like: const parsed = results.reduce((acc, cur) => { return ... }, {}) then I think, that it should work — Dariusz Legizynski
– Dariusz Legizynski, Commented Jan 13, 2023 at 10:55
Yes, because you start with results (which must be an array?) and create parsed, but in your question you present it as if you start with myObject and want to end with myObject having a different structure. — trincot
– trincot, Commented Jan 13, 2023 at 10:58

Damzaky · Accepted Answer · 2023-01-13 10:51:10Z

4

You don't need any function for that, just use spread operator:

const myObject = {
  first: 'A',
  second: {
    nestedArr1: ['nestA', 'nestB'],
    nestedArr2: ['nestC', 'nestD'],
  }
}

const {
  second,
  ...newObj
} = {
  ...myObject,
  ...myObject.second
}

console.log(newObj)

answered Jan 13, 2023 at 10:51

Damzaky

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1 Comment

Dariusz Legizynski Over a year ago

ahh ofc, thanks. Why am I making things so overcomplicated?

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