使用 javascript 中的键更新对象的 object 中的嵌套值

Question

I have a nested object:

myObject {
  "fshkj78gds": {
    "name": "Joe",
    "created_at": {
      "nanoseconds": 745000000,
      "seconds": 1645468219,
    },
    "updated_at": {
      "nanoseconds": 0,
      "seconds": 1645471800,
    },
  },
  "gsdg987": {
    "name": "Mike",
    "created_at": {
      "nanoseconds": 745000000,
      "seconds": 1645468219,
    },
    "updated_at": {
      "nanoseconds": 0,
      "seconds": 1645471800,
    },
  },
}

I would like to convert created_at and updated_at in each nested object to only return the seconds instead as a number like so:

myObject {
  "fshkj78gds": {
    "name": "Joe",
    "created_at": 1645468219,
    "updated_at": 1645471800,
  },
  "gsdg987": {
    "name": "Joe",
    "created_at": 1645468219,
    "updated_at": 1645471800,
  },
}

I am thinking I will need a mix of map and Object.assign as well as spread operator?

So far I got to:

Object.assign({}, myObject, Object.values(myObject).map((nestedObject) =>
  Object.assign({}, nestedObject, {...nestedObject, created_at: nestedObject.created_at.seconds})
))

But this generates an array of objects and doesn't keep the original structure. What's the proper way to do this?

Answer 1

Use forEach() to iterate over the values and then just reassign the properties.

Object.values(myObject).forEach(item => {
    item.created_at = item.created_at.seconds;
    item.updated_at = item.updated_at.seconds;
});

Answer 2

Using Object#fromEntries , Object#entries , and Array#map :

 const myObject = { "fshkj78gds": { "name": "Joe", "created_at": { "nanoseconds": 745000000, "seconds": 1645468219 }, "updated_at": { "nanoseconds": 0, "seconds": 1645471800 } }, "gsdg987": { "name": "Mike", "created_at": { "nanoseconds": 745000000, "seconds": 1645468219 }, "updated_at": { "nanoseconds": 0, "seconds": 1645471800 } } }; const res = Object.fromEntries( Object.entries(myObject).map(([ key, value ]) => ([ key, {...value, 'created_at': value['created_at'].seconds, 'updated_at': value['updated_at'].seconds, } ])) ); console.log(res);

Answer 3

for (let key in obj) { obj[key].created_at = obj[key].created_at.seconds; obj[key].updated_at = obj[key].updated_at.seconds; }