CODEWITHSUNDEEP
javascriptobject
TransmissionsDev
TransmissionsDev

Reputation: 398

Order nested objects by parameter JS

Is there a way to sort nested objects by one of their parameters?

For example, if I have a data structure like this: 

var someObject = {
  'part1328': {
    'time': 1543203609575,
  },
  'part38321': {
    'time': 1543203738716,
  },
  'part1328': {
    'time': 1543203746046,
  },
  'part38338': {
    'time': 1543203752264,
  }

};

and I don't know how many parts I'll have in advance or what their names will be. Is there a way I can sort the parts by their time and get the most recent and oldest parts?

Upvotes: 1

Views: 168

Answers (3)

Yosvel Quintero
Yosvel Quintero

Reputation: 19070

You can maintain the sorted list by creating an array sorted by time

Code:

const someObject = {
  'part1328': {
    'time': 1543203609575,
  },
  'part38321': {
    'time': 1543203738716,
  },
  'part1328': {
    'time': 1543203746046,
  },
  'part38338': {
    'time': 1543203752264,
  }
};

const result = Object.keys(someObject)
  .sort((a, b) => someObject[a].time - someObject[b].time)
  .map(k => ({ [k]: someObject[k] }));

console.log(result);

Upvotes: 0

Amadan
Amadan

Reputation: 198314

You cannot sort an object. You can sort a list of object's keys, you can sort object's values, or the list of pairs of a key and a corresponding value ("entries"). Here's the first approach:

Object.keys(someObject).sort((a, b) => a.time - b.time)
// => ["part1328", "part38321", "part38338"]

You can then use these sorted keys to access the values in the original object in the desired order.

Note also that objects can't have repeating keys; they just overwrite each other. Thus, the fourth value is gone even before you assigned it to someObject.

Upvotes: 1

Mark
Mark

Reputation: 92440

You can use Object.entries to get the set of key/value pairs as a list. Then you can sort that list and arrange the data however you like:

var someObject = {
  'part1328': {
    'time': 1543203609575,
  },
  'part38321': {
    'time': 1543203738716,
  },
  'part1328': {
    'time': 1543203746046,
  },
  'part38338': {
    'time': 1543203752264,
  }

};

let arr = Object.entries(someObject).sort((a, b) => a.time - b.time)
console.log(arr)


// from here you can manage the data any way you want. 
// for example, an array of simple objects:

let merged = arr.map(([key, value]) => ({id: key, ...value}) )
console.log(merged)

Upvotes: 3

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