simplest unique array sort algo in short form

uniq-sort.js

//Task: Transform this simple sorting algorithm into a unique sort. 
// It should not return any duplicate values in the sorted array.

//input: [1,5,2,1] => output: [1,2,5]
//input: [4,2,2,3,2,2,2] => output: [2,3,4]


const uniqSort = obj => arr =>
Object
  .keys(arr.reduce((acc, curr) => {  
    acc.i ? null : acc[curr] = true
    return acc
  }, {}))
  .sort((a, b) => a - b)

uniqSort({})([4,2,2,3,2,2,2]); // => [2,3,4]