Iterate object keys and get inner object's keys into one array

Question

I'm trying to get the keys of Object.keys all into one array but am having some difficulty.

Currently Im trying this but I get an array of each of the Object keys Object.keys(myObject).map(x=>Object.keys(myObject[x]))

Object:

    {
   "a1G0R000002Sv15UAC":{
      "a1K0R000000ytEsUAI":{ <---
         "test2_2":"test2"
      }
   },
   "a1G0R000002SvdYUAS":{
      "a1K0R000000yu8EUAQ":{ <---
         "test2_2":"test2"
      },
      "a1K0R000000ytEsUAI":{ <---
         "string_1":"test"
      }
   },
   "a1G0R000002T4NIUA0":{
      "a1K0R000000ytEsUAI":{ <---
         "string_1":"test"
      }
   }
}

Desired array: ["a1K0R000000ytEsUAI","a1K0R000000yu8EUAQ","a1K0R000000ytEsUAI","a1K0R000000ytEsUAI"]

Addis · Accepted Answer · 2020-03-17 20:17:00Z

1

You can use flat to convert the result into a single array"

const myObject =     {
   "a1G0R000002Sv15UAC":{
      "a1K0R000000ytEsUAI":{ 
         "test2_2":"test2"
      }
   },
   "a1G0R000002SvdYUAS":{
      "a1K0R000000yu8EUAQ":{ 
         "test2_2":"test2"
      },
      "a1K0R000000ytEsUAI":{ 
         "string_1":"test"
      }
   },
   "a1G0R000002T4NIUA0":{
      "a1K0R000000ytEsUAI":{ 
         "string_1":"test"
      }
   }
}

const keys = Object.keys(myObject).map(key => Object.keys(myObject[key])).flat();

console.log(keys)

answered Mar 17, 2020 at 20:17

Addis

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Comments

Shubhaw Kumar · Accepted Answer · 2020-03-17 20:11:06Z

0

You will have to use 2 for..in loops. In simple words, for..in loop iterates over the key of an object. For more information, you can have a look at MDN doc.

const originalObject = {
   "a1G0R000002Sv15UAC":{
      "a1K0R000000ytEsUAI":{ 
         "test2_2":"test2"
      }
   },
   "a1G0R000002SvdYUAS":{
      "a1K0R000000yu8EUAQ":{ 
         "test2_2":"test2"
      },
      "a1K0R000000ytEsUAI":{ 
         "string_1":"test"
      }
   },
   "a1G0R000002T4NIUA0":{
      "a1K0R000000ytEsUAI":{ 
         "string_1":"test"
      }
   }
}

const desiredArray = []

for (let i in originalObject) {
  for(let j in originalObject[i]) {
    desiredArray.push(j)
  }
}

console.log(desiredArray)

answered Mar 17, 2020 at 20:11

Shubhaw Kumar

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2 Comments

626 Over a year ago

thanks! I had a similar solution but was trying to see if was possible to accomplish this with .map or something else rather than 2 loops

Shubhaw Kumar Over a year ago

Cool. Then you should go with the answer by@Addis and @ferhen. But I guess, if you are trying to use Object.keys and map for better time complexity, I think both approach would have same time complexity.

ferhen · Accepted Answer · 2020-03-17 20:15:24Z

0

Using map

Object.entries(myObject).map(x => Object.keys(x[1])).flat()

answered Mar 17, 2020 at 20:15

ferhen

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