How to get specific keys from object? (JS)

Question

I have this object:

728394 : {
    "playersAmount" : 2,
    "players" : {
      "LRFe9w9MQ6hf1urjAAAB" : {
        "nickname" : "spieler1",
        "type" : "player1"
      },
      "nKUDWEd5p_FCBO4sAAAD" : {
        "nickname" : "spieler2",
        "type" : "player2"
      },
      "ghdaWSWUdg27sf4sAAAC" : {
        "nickname" : "spieler3",
        "type" : "spectator"
      }
    },
    "activePlayer" : "LRFe9w9MQ6hf1urjAAAB",
    "board" : [
      [0, 0, 0, 0, 0, 0],
      [0, 0, 0, 0, 0, 0],
      [0, 0, 0, 0, 0, 0],
      [0, 0, 0, 0, 0, 0],
      [0, 0, 0, 0, 0, 0],
      [0, 0, 0, 0, 0, 0],
      [0, 0, 0, 0, 0, 0]
    ]
  }

How do I get everything of the object above except for the k/v pair "board"? is there any other way than just adding every key except the right one?

CherryDT · Accepted Answer · 2020-05-11 16:38:58Z

3

You can create a copy and then delete the unwanted key:

const copy = { ...original }
delete copy.unwantedProperty

Of course you can instead delete the property on the original if you don't care about mutating it.

(Note: if your environment doesn't support the syntax { ...original }, you can use Object.assign({}, original) instead.)

EDIT: Actually, this answer is even neater.

edited May 11, 2020 at 16:38

answered May 11, 2020 at 15:20

CherryDT

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2 Comments

Adam Over a year ago

In case ES6 can't be used: var copy = JSON.parse(JSON.stringify(original)); delete copy.unwantedProperty;

CherryDT Over a year ago

That is much slower though and will destroy anything that cannot be represented with JSON, such as dates, functions, etc.

Max Mykal · Accepted Answer · 2020-05-11 15:40:29Z

3

  const { board, ...everythingButBoard } = yourObject

answered May 11, 2020 at 15:40

Max Mykal

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1 Comment

CherryDT Over a year ago

Actually that's a really cool use of destructuring that I didn't think about! Neater than my answer.

S K R · Accepted Answer · 2020-05-11 15:37:23Z

1

simple answer will be:

const copyObject = Object.assign({}, yourObject) // to make a copy of original variable
delete copyObject['keyToRemove'] // OR delete copyObject.keyToRemove

else if you want to delete from original variable:

delete yourObject['keyToRemove'] // OR delete yourObject.keyToRemove

answered May 11, 2020 at 15:37

S K R

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Comments

Juan Moreno · Accepted Answer · 2020-05-11 15:26:40Z

0

I think you can create a new object excluding this key using a for...in

object = {
  wantedKey: 'wantedValue',
  wantedKey2: 'wantedValue2',
  wantedKey3: 'wantedValue3',
  unwantedKey: 'unwantedValue'
}
const newObject = {}
for (const key in object) {
  if (key !== 'unwantedKey') newObject[key] = object[key]
}
console.log(newObject)

for more info about for...in: click here

answered May 11, 2020 at 15:26

Juan Moreno

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