Transform json to json

Problem description :

Write a function which transforms the given JSON as shown belows :

Input : Given an endorsment array with objects containing skill and user keys

var endorsements = [
  { skill: 'javascript', user: 'Chad' },
  { skill: 'javascript', user: 'Bill' },
  { skill: 'javascript', user: 'Sue' },
  { skill: 'html', user: 'Sue HTML' },
  { skill: 'css', user: 'Sue CSS' },
  { skill: 'css', user: 'Bill CSS' }
];

Output : And we want to transform an given endorsment array with an array which is a collection of objects with key skill and users. But user key is an array containing all the users with that particular skill.

[
  { skill: 'javascript', user: [ 'Chad', 'Bill', 'Sue' ], count: 3 },
  { skill: 'css', user: [ 'Sue', 'Bill' ], count: 2 },
  { skill: 'html', user: [ 'Sue' ], count: 1 } 
];

Logic :

Create a JSON with key being skill value, for example javascript
Add value to the key being user with that skill, for example Chad
Map the newly created JSON to format accordingly output

Solution :

json 5 linkedin 3 transform 1