How to sort an array from an object?

Question

How to sort an array from an object ? The code :

         let A = [ { text: '故事', value: 'story', },
                   { text: '诗歌', value: 'poetry', },
                   { text: '励志', value: 'inspirational', }
                 ];
         // array B from backend** 
         let B = { 
                   story: 2,
                   poetry: 34,
                   inspirational: 30,
                 };

I want to get this :

             [ 
               { text: '诗歌', value: 'poetry', },
               { text: '励志', value: 'inspirational'},
               { text: '故事', value: 'story', }, 
             ];

Answer 1

Simply you can use JavaScript sort function.

Note: When sorting numbers, you can simply use the compact comparison:

Compact Comparison:: myArray.sort((n1,n2) => n1 - n2);

let A = [ { text: '故事', value: 'story', },
                   { text: '诗歌', value: 'poetry', },
                   { text: '励志', value: 'inspirational', }
                 ];
         // array B from backend** 
         let B = { 
                   story: 2,
                   poetry: 34,
                   inspirational: 30,
                 };
 A.sort((a, b) => B[b.value]-B[a.value] );
                 console.log(A);

Answer 2

You can use an arrow function in array.sort as a custom comparator. Sorting in reverse order is accomplished by indexing into the B object to retrieve the sort value for compared elements and subtracting a's value from b.

let A = [ 
  { text: '故事', value: 'story', },
  { text: '诗歌', value: 'poetry', },
  { text: '励志', value: 'inspirational', }
];
let B = { 
  story: 2,
  poetry: 34,
  inspirational: 30,
};

const sorted = A.sort((a, b) => B[b.value] - B[a.value]);

console.log(sorted);