Sorting object keys in javascript based on value

Question

I am receiving weird response from 3rd party api , that looks like below

{
  "27000CE": -1,
  "27100CE": 2,
  "27300CE": -1,
  "27200CE": 5
}

How do I sort this by value ?

like ascending or descending.

{
  "27300CE": -1,
  "27000CE": -1,
  "27100CE": 2,
  "27200CE": 5
}

I tried something like below

sortArrayOfObjects = (arr, key) => {
    return arr.sort((a, b) => {
        return a[key] - b[key];
    });
};

But all keys are different and thats the problem.

yea type of this seems to be like object ,, but thats the response i receive by api — Gracie williams, Feb 27 '19 at 08:31
Is this a text response? Like, is the API sending this exact string of characters? If so, the first order of business is to manually parse it into an actual array / object. — , Feb 27 '19 at 08:32
hi , i edited my question , please remove the downvote , thank you — Gracie williams, Feb 27 '19 at 08:36

adiga · Accepted Answer · 2019-02-27T08:51:39.603

You can sort the Object.entries and then create a new object using reduce like this:

const response = {
  "27100CE": 2,
  "27000CE": -1,
  "27300CE": -1,
  "27200CE": 5
}

const sorted = Object.entries(response)
                         .sort((a, b) => a[1] - b[1])
                         .reduce((r, [key, value]) => {
                            r[key] = value
                            return r
                         }, {})

console.log(sorted)

This works only if you don't have any integer keys in response. More info: Does JavaScript Guarantee Object Property Order?

score 0 · Answer 2 · answered Feb 27 '19 at 08:34

0

I believe you receive an object, in that case your input will be like this:

let obj = {"27300CE": -1, "27200CE": 5, "27100CE": 2, "27000CE": -1}

And you can sort by values like so:

let keys = Object.keys(obj);

// Then sort by using the keys to lookup the values in the original object:
keys.sort(function(a, b) { return obj[a] - obj[b] });

console.log(keys);//["27300CE", "27000CE", "27100CE", "27200CE"]

based upon new keys sequence you can create a new obj , sorted one if you like

answered Feb 27 '19 at 08:34

Abhay Maurya

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hi , this sorts only key , i need it with value too – Gracie williams Feb 27 '19 at 08:54
yeah well, you can use it to generate a new sorted obj, i didnt know it was a big of a deal – Abhay Maurya Feb 27 '19 at 10:14

Sorting object keys in javascript based on value

2 Answers2