How to recursively traverse a tree object?

Question

JavaScript

Let's say we have a tree structure object:

const obj = {
  something: {
    something1: 'value',
    something2: 'value1',
    something3: {
      something4: 'value2'
    }
  }
};

I want to recursively go through it and get, for example, only the keys of the object. How to do it? Help me please.

Answer 1

const obj = {
  something: {
    something1: 'value',
    something2: 'value1',
    something3: {
      something4: 'value2'
    }
  }
}
const getKeys = obj => {
  const res = []
  for (const key in obj) {
    res.push(key)
    obj[key] && Object.getPrototypeOf(obj[key]) === Object.prototype && res.push(...getKeys(obj[key]))
  }
  return res
}
console.log(getKeys(obj))
//[ 'something', 'something1', 'something2', 'something3', 'something4' ]

Option