How can I sort an object alphabetically by value?-CodePudding

So I have a list of countries, by default they come sort by ISOA2 Code which is some kind of country code.

Say this list:

{
  "AD": "Andorra",
  "AE": "United Arab Emirates",
  "AF": "Afghanistan",
  "AG": "Antigua and Barbuda",
  "AI": "Anguilla",
  "AL": "Albania",
  "AM": "Armenia",
  "AN": "Netherlands Antilles",
  "GB": "United Kingdom"
}

And I have this code:

    function sortObject(obj) {
      return Object
        .keys(obj)
        .sort()
        .reduce((a, v) => {
          a[v] = obj[v];
          return a;
        }, {});
    }

    
    // data is the list of countries
    const result = sortObject(data);

I am trying to sort it with that code but it always returns the same list.

I need the list to be like this:

{
  "AF": "Afghanistan",
  "AL": "Albania",
  "AD": "Andorra",
  "AI": "Anguilla",
  "AG": "Antigua and Barbuda",
  "AM": "Armenia",
  "AN": "Netherlands Antilles",
  "AE": "United Arab Emirates",
  "GB": "United Kingdom"
}

What am I doing wrong?

You can play around here:

https://codesandbox.io/s/js-playground-forked-xk005?file=/src/index.js

You will see the result in the console.

CodePudding user response：

Take the Object.entries sort them by value, then use Object.fromEntries to turn this array of key-value pairs back into an object:

 Object.fromEntries(
   Object.entries(obj)
    .sort(([keyA, valueA], [keyB, valueB]) => valueA.localeCompare(valueB))
  )

Note that sorting objects is senseless if there are numeric keys or if the object is mutated (as that changes sort order again).

CodePudding user response：

Try this for sorting:

const sortObject = obj => {
  const ret = {}
  Object.values(obj)
      .sort()
      .forEach(val => {
          const key = Object.keys(obj).find(key => obj[key] === val)
          ret[key] = val
      })
  return ret
}

CodePudding user response：

Does this works for you?

function sortObject(obj) {
  return Object.fromEntries(Object
    .entries(obj)
    .sort((a,b)=>a[1].localeCompare(b[1])));
}

const data = {
  "AD": "Andorra",
  "AE": "United Arab Emirates",
  "AF": "Afghanistan",
  "AG": "Antigua and Barbuda",
  "AI": "Anguilla",
  "AL": "Albania",
  "AM": "Armenia",
  "AN": "Netherlands Antilles",
  "GB": "United Kingdom"
}

// data is the list of countries
const result = sortObject(data);

console.log(result);