Add new object to another object's object

Question

var obj = {}

obj.cats = {'name': 'Milo', 'age': 3} // first item

Object.assign(obj.cats, {'name': 'Simba', 'age': 2}) // add new item to obj.cats

console.log(obj) // result one item in obj.cats (Simba)

How can I add to the obj.cats here? All solutions I try they override cats

Wanted result:

obj {
 cats : {
     {'name': 'Milo', 'age': 3},
     {'name': 'Simba', 'age': 2}
 }
}

An object has to have unique keys, so they will be overridden with the newer ones, what is your expected/wanted output? — Nick Parsons
– Nick Parsons, Commented Dec 11, 2019 at 0:30
are you saying that I have to add an array somewhere in the obj? I edited the question with what I want. Thx — baDrosa82
– baDrosa82, Commented Dec 11, 2019 at 0:35
Your expected result is not a valid Javascript data structure. You have two values in the obj.cats object, but no keys. Objects are collections of key-value-pairs, where the keys must be unique per-object. — connexo
– connexo, Commented Dec 11, 2019 at 0:35

connexo · Accepted Answer · 2019-12-11 00:35:04Z

3

You can use an array of objects:

var obj = {}

obj.cats = [{name: 'Milo', age: 3}] // first item

obj.cats.push({name: 'Simba', age: 2}) // add new item to obj.cats

console.log(obj) // result two items in obj.cats (Milo & Simba)

answered Dec 11, 2019 at 0:35

connexo

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Mamun · Accepted Answer · 2019-12-11 00:40:48Z

1

Your wanted result is not valid, you can try with the object key:

var obj = {}

obj.cats = {1:{'name': 'Milo', 'age': 3}} // first item

Object.assign(obj.cats, {2:{'name': 'Simba', 'age': 2}}) // add new item to obj.cats

console.log(obj) // result one item in obj.cats (Simba)

answered Dec 11, 2019 at 0:40

Mamun

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