sort array by 2 dynamic keys

Question

I have an array like this. I need to write a function to pass in any two fields and have it sorted. example sort('company_id', 'title') should first sort by company_id and then title. How to write a generic function for it

This is the array and my logic:

 [ {
    id: 11861,
    deadline: '01/13/2020',
    status: 'printed',
    buyer_name: 'Dion Murray PhD'
  },
  {
    id: 11848,
    deadline: '12/14/2019',
    status: 'published',
    buyer_name: 'Dion Murray PhD'
  },
  {
    id: 11849,
    deadline: '12/14/2019',
    status: 'published',
    buyer_name: 'Dion Murray PhD'
  },
  {
    id: 11857,
    deadline: '12/22/2019',
    status: 'new',
    buyer_name: 'Dion Murray PhD'
  }

]


sort ( dataToSort, sortField1 , sortField2) {
       rawData.dataToSort( (a, b) => (a[sortField1] > b[sortField1]) ? 1 : ((a[sortField2] > b[sortField2) ? 1 : -1)} ```


TIA.

Does this answer your question? [How to sort an array of objects by multiple fields?](https://stackoverflow.com/questions/6913512/how-to-sort-an-array-of-objects-by-multiple-fields) — Sid Vishnoi, Dec 04 '19 at 15:40

Nina Scholz · Answer 1 · 2019-12-04T18:54:25.293

You could take a comparison which works for numbers as well as for strings

a > b || -(a < b)

and get the wanted properties and chain the conditions.

sortBy = (key1, key2) => (a, b) =>
     a[key1] > b[key1] || -(a[key1] < b[key1]) || a[key2] > b[key2] || -(a[key2] < b[key2])

usage:

array.sort(sortBy('company_id', 'title'));

for using an arbitrary count of keys, you could take the parameters as array and iterate the array until the callback gets a value not equal zero.

const
    sortBy = (...keys) => (a, b) => {
        var r = 0;
        keys.some(k => r = a[k] > b[k] || -(a[k] < b[k]));
        return r;
    };

usage:

array.sort(sortBy('company_id', 'title', 'status'));

score 1 · Accepted Answer · answered Dec 04 '19 at 15:45

You can also use the module lodash with sortBy

Example :

const _ = require('lodash');

const users = [
  { 'user': 'fred',   'age': 48 },
  { 'user': 'barney', 'age': 36 },
  { 'user': 'fred',   'age': 40 },
  { 'user': 'barney', 'age': 34 }
];

_.sortBy(users, ['user', 'age']);
// => objects for [['barney', 34], ['barney', 36], ['fred', 40], ['fred', 48]]

score 1 · Answer 3 · answered Dec 04 '19 at 16:01

// generic sort, 'propa, propb desc'

function sort(data, sort) {
    var asort=sort.split(',');
    var psort=[];
    for(var i=0,l=asort.length;i<l;i++) {
        var sprop=asort[i].trim();
        if (!sprop) continue;
        var spropa=sprop.split(' ');
        psort.push({prop:spropa[0],desc:(spropa[1]=='desc')?-1:1});
    }

    var psortl=psort.length;
    data.sort(function(a,b) {
        for(var i=0;i<psortl;i++) {
            var cpsort=psort[i];
            if (a[cpsort.prop]>b[cpsort.prop]) return cpsort.desc;
            if (a[cpsort.prop]<b[cpsort.prop]) return 0-cpsort.desc;
        }
        return 0;
    });
    return data;
}

score -1 · Answer 4 · answered Dec 04 '19 at 15:43

-1

You can try :

obj.sort(function(a, b) {
    return a["company_id"] - b["company_id"] || a["title"] - b["title"];
});

answered Dec 04 '19 at 15:43

Toto NaBendo

290
3
26

This is not generic – Vitalii Chmovzh Dec 04 '19 at 22:24

sort array by 2 dynamic keys

4 Answers4