Sort a JSON array by one field during iteration using JS

Question

I have an array as follows:

var array = {"week1":[{"id":1,"name":"x","mark":"20"},{"id":2,"name":"y","mark":"30"}],"week2":[{"id":1,"name":"x","mark":"40"},{"id":2,"name":"y","mark":"60"},{"id":3,"name":"z","mark":"10"}]}

I want to sort the array by mark field. How can I achieve this?

UPDATE

I used the following function to sort the above array object by mark.

$scope.GetSortOrder = function(prop) {  
    return function(a, b) {  
        if (a[prop] > b[prop]) {  
            return 1;  
        } else if (a[prop] < b[prop]) {  
            return -1;  
        }  
        return 0;  
    }  
};

array.sort($scope.GetSortOrder("mark"));

But then I get the following error

array.sort is not a function

Desired output

  var outPut = 
  {
    "week1":[
       {"id":1,"name":"x","mark":"20"},
       {"id":2,"name":"y","mark":"30"}
    ],
    "week2":[
       {"id":3,"name":"z","mark":"10"},
       {"id":1,"name":"x","mark":"40"},
       {"id":2,"name":"y","mark":"60"}
    ]
  }

[MDN JavaScript Reference - Array sort](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort) — georgeawg, Jul 12 '19 at 11:34
I have updated my question and after using sort() I am getting an error. Can you please look into that? @georgeawg — tharindu, Jul 15 '19 at 01:20
`var array` is **not** an array, it's an object with the week numbers as keys. Are you trying to sort the associated values? — Tyler Roper, Jul 15 '19 at 01:21
try putting everything in brackets inside of an array. `[ {info} ]` and then try it — mph85, Jul 15 '19 at 01:24
@TylerRoper Yes I wanted to sort associated values of the mark key — tharindu, Jul 15 '19 at 01:37
Please add the desired output to your question. It's still unclear. — Tyler Roper, Jul 15 '19 at 01:42
@TylerRoper Please check the question. I added the desired output — tharindu, Jul 15 '19 at 01:45
@TylerRoper and also my var array is a JSON object and if I use JSON.stringify(array) only im getting the above mentioned array — tharindu, Jul 15 '19 at 01:50
https://stackoverflow.com/questions/48460082/sort-json-response-by-key-value — mph85, Jul 15 '19 at 01:51

Tyler Roper · Accepted Answer · 2019-07-15T13:32:05.370

var array is not an array (it's an object), therefore you can't use .sort() on it.

It looks like you want to sort the object's values. If so, you want to fetch the object's values using Object.values(), loop through them, and sort those instead.

var obj = {"week1":[{"id":1,"name":"x","mark":"20"},{"id":2,"name":"y","mark":"30"}],"week2":[{"id":1,"name":"x","mark":"40"},{"id":2,"name":"y","mark":"60"},{"id":3,"name":"z","mark":"10"}]}

Object.values(obj).forEach(arr => arr.sort((a,b) => a.mark-b.mark));

console.log(obj);

If you preferred a method that accepts a property name (like in your example), perhaps this curried approach would work for you.

var obj = {"week1":[{"id":1,"name":"x","mark":"20"},{"id":2,"name":"y","mark":"30"}],"week2":[{"id":1,"name":"x","mark":"40"},{"id":2,"name":"y","mark":"60"},{"id":3,"name":"z","mark":"10"}]}

const sortArrayByProperty = prop => arr => arr.sort((a,b) => a[prop].localeCompare(b[prop]));

Object.values(obj).forEach(sortArrayByProperty("mark"));

console.log(obj);

Not sure I'm following the question. Each `arr` represents one of your object's values, e.g. `[{"id":1,"name":"x","mark":"20"},{"id":2,"name":"y","mark":"30"}]`. — Tyler Roper, Jul 15 '19 at 01:59

Sort a JSON array by one field during iteration using JS

1 Answers1